Soerja Koesnarpadi - Academia.edu (original) (raw)
Papers by Soerja Koesnarpadi
IOP Conference Series: Earth and Environmental Science, 2021
Synthesis and characterization of Fe3O4-Activated Carbon (Fe3O4-AC) and the application to adsorb... more Synthesis and characterization of Fe3O4-Activated Carbon (Fe3O4-AC) and the application to adsorb methylene blue has been conducted. The Fe3O4-AC was synthesized using the co-precipitation method on alkaline conditions. The Fe3O4 was prepared from mixing mole ratio of Fe3+ and Fe2+ = 3:2, and AC was made from an egg rack. Composite of Fe3O4-AC was characterized using Fourier Transform Infra-Red (FTIR), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), and Vibrating Sample Magnetometer (VSM). FTIR characterization was indicated the appearance peak of a C-O vibration at 1033.85 cm−1 and a functional group of Fe-O at 540.07 cm−1. XRD pattern of Fe3O4-AC was the presence peak of crystal structure Fe3O4, even though it’s small intensity. SEM image of Fe3O4-AC was spherical with the denser pore of structure. The saturation magnetization of Fe3O4-AC was lower than Fe3O4. The result showed that adsorption of methylene blue on Fe3O4-AC and AC was optimum at pH 7. The sorption of m...
Synthesis, characterization and application of Diatomaceous Earth-4,4-Diamino diphenylether-O-Hyd... more Synthesis, characterization and application of Diatomaceous Earth-4,4-Diamino diphenylether-O-Hydroxybenzaldehyde (diatomaceous earth-DDE-O-Hb) as an adsorbent of Ag(I) metal ion has been done. The aim of the purification of natural diatomaceous earth with KMnO4, H2SO4 and HCl were to obtain pure diatomaceous earth, remove the other compounds and de-alumination, respectively. The adsorbent of diatomaceous earth-DDE-O-Hb was synthesized by reacting pure diatomaceous earth with 3-chloropropyltrimethoxysilane, 4,4-diaminodiphenylether (DDE) and O-hydroxybenzaldehyde (O-Hb). The FTIR spectroscopy was used to identify Schiff base group in diatomaceous earth-DDE-O-Hb adsorbent. The diatomaceous earth-DDE-O-Hb was applied as adsorbent in the adsorption of Ag(I) metal ion. Parameters influencing the interaction such as time, pH and concentration were optimized. The result showed that diatomaceous earth-DDE-O-Hb adsorbent have Schiff base group. The interaction time of 90 min showed that 70....
Jurnal Bahan Alam Terbarukan
Sonocatalysis was used to study phenol degradation using a ZnO/WO3 composite. The degradation was... more Sonocatalysis was used to study phenol degradation using a ZnO/WO3 composite. The degradation was assisted by ultrasonic waves at 40 KHz and conducted using the sonocatalysis technique. The degradation percentage was calculated using data from the UV-Vis spectrophotometer. The composite characterization results showed that the samples containing WO3, ZnO and also contained a new structure ZnWO4. The morphological length and width of the composites were revealed by SEM examination. Furthermore, heterogeneous particle sizes were discovered. The surface area of composite was bigger than before combined. The optimum condition in degradation of phenol by ZnO-WO3 composite are 0,4 g of catalyst at 30 ppm of phenol, 7 min reaction time with the greatest phenol degradation at 92,5%. The catalyst can be reused 5 times to degrade phenol at 85%. The composite catalyst and assisted with ultrasonic as the sonocatalytic technique are one of the most environmentally and cost effective.
AGRIVOLTAICS2021 CONFERENCE: Connecting Agrivoltaics Worldwide
Lead(II) is a major environmental pollutant classified as toxic and carcinogenic. Recently, Lead(... more Lead(II) is a major environmental pollutant classified as toxic and carcinogenic. Recently, Lead(II) sorption is very effective using fulvic acid-functionalized magnetite. This research aims to synthesize and characterize fulvic acidsfunctionalized magnetite and its application for lead(II) adsorption in aqueous solutions. The fulvic acids-functionalized magnetite is prepared using co-precipitation method in an alkanine conditions with mass ratios of fulvic acids and magnetite = 1:6. The fulvic acids was extracted from peat soils of the Samboja area of East Kalimantan using a 1 M NaOH solution. The adsorbent was characterized using Fourier Transform Spectrometer (FTIR), X-ray Difractometer (XRD) and Vibrating sample magnetometer (VSM). The successfully of fulvic acid-functionalized magnetite was shown by the FT-IR spectrum formation of Fe-O group, OH group, the aliphatic C-H group and the shift in the wave number on the C-H group on the carboxylate. Fulvic acids after being functionalized on magnetite, did not change the crystal structure of magnetite but can decrease the magnetization value, but was still effective for separation using a magnetic field. The experiment result showed that fulvic acid-functionalized magnetite had optimum lead(II) adsorption at pH 8 and contact time of 150 minute with adsorption capacity of 19,39 mg/g and percentage of adsorption 97%. The adsorption performance of lead(II) on fulvic acid functionalized magnetite is very effective and higher than lead(II) adsorption on magnetite alone.
AIP Conference Proceedings
The degradation of dyestuffs by the photocatalysis method is fascinating because it is simple and... more The degradation of dyestuffs by the photocatalysis method is fascinating because it is simple and reduces the quantity of new waste generated during the process. The purpose of this study is to use a Zn-Fe 3 O 4 /WO 3 composite to photocatalyst the degradation of methylene blue as a model organic pollutant. X-ray Diffraction (XRD) and scanning electron microscope (SEM) were used to examine the catalyst's properties. The XRD investigation confirmed the presence of a composite structure of Zn-Fe 3 O 4 /WO 3. The morphological particles of Zn-Fe 3 O 4 /WO 3 are non-uniform and tend to agglomerate, as evidenced by the SEM image. The optimal conditions of the photocatalytic process were 50 mL methylene blue (10 ppm), 0.2 g weight of Zn-Fe 3 O 4 /WO 3 catalyst, and a contact time of 30 minutes, which resulted in an 81.38 % degradation.
AIP Conference Proceedings
The rapid development of the textile industry in Indonesia has increased the need for dyes. Meanw... more The rapid development of the textile industry in Indonesia has increased the need for dyes. Meanwhile, magnetite nanoparticles are widely used due to their large adsorption capacity, nano-sized with a wider surface area, non-toxic, biodegradable, and easily separated due to their magnetic properties. Therefore, this study aims to examine the preparation and characterization of fulvic acid-coated magnetite nanoparticles (MnP-FA) and their application for methylene blue (MB) adsorption with variations in pH, contact time, and concentration. The extraction of FA from peat soil in Samboja, East Kalimantan under alkaline conditions and then coated with MnP using the coprecipitation method. FTIR characteristics result of MnP-FA was shown the interaction of the carboxyl group on FA with the Fe-O surface on MnP, loss of C-H deformation at 1404 cm-1, and a shift in the C-H carboxylate group at 1126 cm-1. MnP-FA diffractogram did not change the crystal structure compared to MnP, and SEM image MnP-FA showed that the morphology is a smooth surface with non-uniform size attached to the spherical MnP. The magnetic property decreased after the addition of FA but is still attracted by an external magnet. Adsorption of methylene blue using MnP-FA was optimum at pH 7 with a contact time of 30 minutes, adsorption capacity (Qa) of 2.20 mg/g, and adsorption percentage of 56.%. The results showed that the capacity of MnP-FA was almost the same as that of MnP but the contact time was more effective for methylene blue adsorption. The results showed that the adsorption capacity of MnP-FA was greater than MnP and contact time was faster for methylene blue adsorption.
Modification adsorbent of magnetite (Fe 3 O 4) coated humic acids (HA) by a co-precipitation meth... more Modification adsorbent of magnetite (Fe 3 O 4) coated humic acids (HA) by a co-precipitation method using ammonium hydroxide have been successfully synthesized. The characterization of FT-IR spectra indicate that the coating Fe3O4/HA have been bound by Fe-COO-R and the XRD patterns does not have effect of the crystals structure. It's applications to degrade of heavy metal Cu and Cr from liquid waste on plywood industries. Degradation of Cu on Fe 3 O 4 /HA and Fe 3 O 4 i.e up 70-90% and then for Cr on Fe 3 O 4 /HA and Fe 3 O 4 i.e 10-40% only. The performance adsorbent of Fe 3 O 4 /HA more effectively than Fe 3 O 4 for degradation of heavy metal Cu and Cr.
Seminar Nasional Pengabdian Kepada Masyarakat (SEPAKAT), Nov 8, 2021
PROSIDING SEMINAR KIMIA, Oct 3, 2021
Procedia Environmental Sciences, 2015
Magnetite nanoparticles (Fe 3 O 4) coated humic acids (HA) by a co-precipitation method using amm... more Magnetite nanoparticles (Fe 3 O 4) coated humic acids (HA) by a co-precipitation method using ammonium hydroxide. The HA was extracted from peat soil of Sambutan, East Kalimantan, Indonesia and then have been succesfully coated onto the surface of Fe 3 O 4. Characterization of FT-IR spectra indicate that the coating Fe 3 O 4 /HA have been bound by Fe-COOR chemical bond. The XRD measurements does not affect the crystals structure. Scanning electron microscopy revealed the magnetic particle size is almost homogenous of 10-18 nm. Both of Fe 3 O 4 and the coating Fe 3 O 4 /HA were of the cubic spinel structure and sphericalshaped morphology. The modification of HA on Fe 3 O 4 can decrease the saturation magnetization from 71.3 emu/g to 69.5 emu/g.
JURNAL ATOMIK, Mar 31, 2021
Magnetite is widely used in various fields of separation, biochemistry, medical and environment. ... more Magnetite is widely used in various fields of separation, biochemistry, medical and environment. Modification of nanoparticle magnetite binding with chitosan is recommended for many biomedical applications, especially as a drug delivery system because in addition to its non-toxic, biodegradable and biocompatible characteristics. Another advantage of biomedical benefits as antimicrobial is that it can increase antibacterial activity and has a more pronounced effect on gram-negative and gram-positive bacteria. Synthesis and characterization of chitosan-magnetite cross-linked tripolyphosphate as an antibacterial of S. typhi (Gram negative) and S. aureus (Gram positive) has been carried out. The phase of this research was initiated by the synthesis of FeSO4.7H2O and FeCl3.6H2O magnetite with a mass ratio of Fe (II): Fe (III) = 2: 3, using the co-precipitation method. In the second stage where the cross-linking of chitosan with TPP cross-linker to form ferrogel. In the third stage the synthesis of TPP-chitosan-magnetite in a ratio of 1: 4, with a slight addition of NH4OH as participant material. The results showed that FT-IR on TPP-chitosan-magnetite has a unique spectrum, XRD results showed the crystal structure of TPP-chitosan-magnetite did not change. Surface morphology shows that TPP-chitosanmagnetite is a spherical surface. Chitosan-Magnetite material has greater antibacterial activity than chitosan and magnetite bacteria S. typhi (Gram negative) and S. aureus (Gram positive).
![Research paper thumbnail of Humic Acid-Modified Magnetite Nanoparticles for Removing [AuCl4]− in Aqueous Solutions](https://attachments.academia-assets.com/84652182/thumbnails/1.jpg)
](Jurnal Kimia Sains dan Aplikasi, 2022
Humic acid-modified magnetite nanoparticle (MnP-HA) has been synthesized using the co-precipitati... more Humic acid-modified magnetite nanoparticle (MnP-HA) has been synthesized using the co-precipitation method and applied for removal of [AuCl4]−. Modifying of MnP-HA was prepared with the mass ratio of MnP-HA=10:1 and 10:3. The HA was extracted from peat soil of Sambutan Village, East Kalimantan, Indonesia, by the recommended procedure of the International Humic Substances Society (IHSS). The saturation magnetization of MnP-HA was decreased compared to unmodified MnP. The interaction between MnP and HA was occurred due to the chemical bond between Fe from MnP with the carboxylic group from HA. The coating HA on the surface of MnP unchanged the formation of the crystal structure of MnP and increased the particle size. The optimum removal of [AuCl4]− on MnP and MnP-HA materials was optimum at pH 3.0. The Langmuir isotherm model with sorption capacity was 0.23, 4.85, and 4.65 mol g–1 for MnP, MnP-HA=10:1, and 10:3, respectively. Using a pseudo-second-order equation, the degradation of th...
The modification of cellulose with 2-mercaptobenzhotiazole (MBT) through grafting and impregnatin... more The modification of cellulose with 2-mercaptobenzhotiazole (MBT) through grafting and impregnating methods has been done. Modified cellulose used as adsorbent for Cu(II) ion in aqueous solution. The aims of research were modification cellulose with 3-chloropropyltrimethoxysilane and 2-mercaptobenzhotiazole (MBT), characterization of the modified cellulose with FTIR, SEM and XRD and adsorption study between cellulose-MBT adsorbent with Cu(II) ion in aqueous solution. The adsorbent of cellulose-MBT was synthesized by reflux process. Adsorption study between cellulose-MBT adsorbent with Cu(II) ion was investigated based on influence of pH solution, interaction time and initial concentration of Cu(II) ion. The result showed that activated cellulose can be modified with MBT to become cellulose-MBT adsorbent. The functional group of –C=N appeared at wavenumber 1658 cm-1 attributed to functional group of-C=N- is Schiff base of MBT. Presence functional group of S-H at cellulose-MBT adsorben...
The adsorption kinetics of Cr(VI) by two adsorbents, i.e. magnetite (Fe 3 O 4 ) and magnetite coa... more The adsorption kinetics of Cr(VI) by two adsorbents, i.e. magnetite (Fe 3 O 4 ) and magnetite coated humic acids (Fe 3 O 4 /HA) have been studied. Adsorbent of Fe 3 O 4 and Fe 3 O 4 /HA were synthesized by co-precipitation method and then characterized by FT-IR, XRD and TEM image measurements. The acidity of the solution was adjusted to pH 3, comparasion on the adsorption kinetics of Cr(VI) on Fe 3 O 4 between Fe 3 O 4 /HA. The FT-IR spectra revealed the presence of main fuctional groups of Fe-O and C-O at free carboxylate acid in Fe 3 O 4 /HA and those of only Fe-O in Fe 3 O 4 . The two adsorbent had similar diffraction peaks at 2θ. The TEM image demonstaretd that Fe 3 O 4 were spherical in shape and uniform distribution and then Fe 3 O 4 /HA had no uniform size. Adsorption of Cr(VI) by Fe 3 O 4 was much faster than Fe 3 O 4 /HA at the acidity of pH 3, with adsorption rate constant (k) of 0.013 g.mg -1 .menit -1 for Fe 3 O 4 and 0.0062 g.mg -1 .menit -1 for Fe 3 O 4 /HA. The two ad...
Selulase merupakan enzim hidrolase yang dapat menghidrolisa selulosa pada ikatan13-1,4—glikosida ... more Selulase merupakan enzim hidrolase yang dapat menghidrolisa selulosa pada ikatan13-1,4—glikosida menghasilkan glukosa Telah dilakukan isolasi dan karaktetisasi enzim selulase dari eairan rumen sapi un¬tuk hidrolisaserbuk gergajian kayu. Ekstrak kasar basil isolasi diuji aktivitas terlebih dahulu pada substrat tertentu dengan tujuan untuk mengetahui jenis enzim yang berperan. Pemurnian dilakukan dengan fraksinasi (NH4)2SO4bertingkat, yakni Fl (0-10%), F2 (10-20%), F3 (20-40A) , F4 (40-60%), F5 (60-80%) dan F6 (80-100%) dilanjutkan sentrifugasi dan dialisis. Jumlah glukosa yang dihasilkan diuji dengan metode Nel¬sou-Somogyi dan diukur absorbansinya pada : 440 urn serta kadar protein diteutu¬kan dengan metode lowry dan diukur absorbansinya. pada : 640 urn menggunakan spektrofotometer uv-vis. Karakterisasi dilakukan pada fraksi enzim dengan aktivitas tertinggi dengan pada kondisi pH, suhu dan waktu inkubasi tertentu. Kondisi optimum yang diperoleh dipakai untuk hidrolisa selulosa dari s...
International Journal of Scientific & Technology Research, 2019
This research studies the effectiveness of TPH bioremediation in oil-exposed soils using E. coli ... more This research studies the effectiveness of TPH bioremediation in oil-exposed soils using E. coli and Klebsiella sp with the addition of urea fertilizer, NPK-Mg 12-12-17 + 2 (N; P; K; Mg = 12%; 12%; 12 %; 2%) and NPK 15-15-15 (N; P; K = 15%; 15%; 15%). The bioremediation process lasts for 3-27 days and during the bioremediation process the TPH level is checked every 72 hours using the InfraCal TPH Analyzer. The results showed that there was an influence on the use of inorganic fertilizers on the length of the bioremediation process, this is because inorganic fertilizers such as urea fertilizer, NPK 12-12-17 + 2 and NPK 15-15-15 contain nutrients needed by bacteria during the bioremediation process so that the bacteria grows optimally. Inorganic fertilizers also affect soil conditions which can cause the bioremediation process to take place faster. The data of this study indicated that the optimal bioremediation conditions were achieved at the highest TPH concentration compared to oth...
Synthesis of humic acid (HA) coated Fe3O4magneticnanoparticles(Fe3O4/HA) were conducted to produc... more Synthesis of humic acid (HA) coated Fe3O4magneticnanoparticles(Fe3O4/HA) were conducted to produce materials for adsorption of Cu(II). The HA was extracted from peat soil of Sambutan, East Kalimantan and the coating of Fe3O4/HA wasperformedbyco-precipitation procedure using ammonium hydroxide. The prepared adsorbent was characterized by FT-IR spectroscopy, and it’s found that the spectrum consist of functional groups of COOH, OH and FeO. The XRD patterns of Fe3O4/HA and Fe3O4 have similar diffraction peaks, It indicates that the coating agent does not affect the crystals structure. The TEM images of Fe3O4/HA shows that the materials were in quasi-spherical shape and had the particle size is almost homogeneous. Adsorption of metal ion Cu(II) by Fe3O4/HA was stable in acid condition at pH 3.0 to 5.0, giving maximum adsorption capacity 2.198 mmol/g at pH 5.0. Adsorption at pH 5.0 during 30 minutes was able removes Cu(II) up to more than 95% The Langmuir of adsorption energy of Fe3O4/HA...
IOP Conference Series: Earth and Environmental Science, 2021
Synthesis and characterization of Fe3O4-Activated Carbon (Fe3O4-AC) and the application to adsorb... more Synthesis and characterization of Fe3O4-Activated Carbon (Fe3O4-AC) and the application to adsorb methylene blue has been conducted. The Fe3O4-AC was synthesized using the co-precipitation method on alkaline conditions. The Fe3O4 was prepared from mixing mole ratio of Fe3+ and Fe2+ = 3:2, and AC was made from an egg rack. Composite of Fe3O4-AC was characterized using Fourier Transform Infra-Red (FTIR), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), and Vibrating Sample Magnetometer (VSM). FTIR characterization was indicated the appearance peak of a C-O vibration at 1033.85 cm−1 and a functional group of Fe-O at 540.07 cm−1. XRD pattern of Fe3O4-AC was the presence peak of crystal structure Fe3O4, even though it’s small intensity. SEM image of Fe3O4-AC was spherical with the denser pore of structure. The saturation magnetization of Fe3O4-AC was lower than Fe3O4. The result showed that adsorption of methylene blue on Fe3O4-AC and AC was optimum at pH 7. The sorption of m...
Synthesis, characterization and application of Diatomaceous Earth-4,4-Diamino diphenylether-O-Hyd... more Synthesis, characterization and application of Diatomaceous Earth-4,4-Diamino diphenylether-O-Hydroxybenzaldehyde (diatomaceous earth-DDE-O-Hb) as an adsorbent of Ag(I) metal ion has been done. The aim of the purification of natural diatomaceous earth with KMnO4, H2SO4 and HCl were to obtain pure diatomaceous earth, remove the other compounds and de-alumination, respectively. The adsorbent of diatomaceous earth-DDE-O-Hb was synthesized by reacting pure diatomaceous earth with 3-chloropropyltrimethoxysilane, 4,4-diaminodiphenylether (DDE) and O-hydroxybenzaldehyde (O-Hb). The FTIR spectroscopy was used to identify Schiff base group in diatomaceous earth-DDE-O-Hb adsorbent. The diatomaceous earth-DDE-O-Hb was applied as adsorbent in the adsorption of Ag(I) metal ion. Parameters influencing the interaction such as time, pH and concentration were optimized. The result showed that diatomaceous earth-DDE-O-Hb adsorbent have Schiff base group. The interaction time of 90 min showed that 70....
Jurnal Bahan Alam Terbarukan
Sonocatalysis was used to study phenol degradation using a ZnO/WO3 composite. The degradation was... more Sonocatalysis was used to study phenol degradation using a ZnO/WO3 composite. The degradation was assisted by ultrasonic waves at 40 KHz and conducted using the sonocatalysis technique. The degradation percentage was calculated using data from the UV-Vis spectrophotometer. The composite characterization results showed that the samples containing WO3, ZnO and also contained a new structure ZnWO4. The morphological length and width of the composites were revealed by SEM examination. Furthermore, heterogeneous particle sizes were discovered. The surface area of composite was bigger than before combined. The optimum condition in degradation of phenol by ZnO-WO3 composite are 0,4 g of catalyst at 30 ppm of phenol, 7 min reaction time with the greatest phenol degradation at 92,5%. The catalyst can be reused 5 times to degrade phenol at 85%. The composite catalyst and assisted with ultrasonic as the sonocatalytic technique are one of the most environmentally and cost effective.
AGRIVOLTAICS2021 CONFERENCE: Connecting Agrivoltaics Worldwide
Lead(II) is a major environmental pollutant classified as toxic and carcinogenic. Recently, Lead(... more Lead(II) is a major environmental pollutant classified as toxic and carcinogenic. Recently, Lead(II) sorption is very effective using fulvic acid-functionalized magnetite. This research aims to synthesize and characterize fulvic acidsfunctionalized magnetite and its application for lead(II) adsorption in aqueous solutions. The fulvic acids-functionalized magnetite is prepared using co-precipitation method in an alkanine conditions with mass ratios of fulvic acids and magnetite = 1:6. The fulvic acids was extracted from peat soils of the Samboja area of East Kalimantan using a 1 M NaOH solution. The adsorbent was characterized using Fourier Transform Spectrometer (FTIR), X-ray Difractometer (XRD) and Vibrating sample magnetometer (VSM). The successfully of fulvic acid-functionalized magnetite was shown by the FT-IR spectrum formation of Fe-O group, OH group, the aliphatic C-H group and the shift in the wave number on the C-H group on the carboxylate. Fulvic acids after being functionalized on magnetite, did not change the crystal structure of magnetite but can decrease the magnetization value, but was still effective for separation using a magnetic field. The experiment result showed that fulvic acid-functionalized magnetite had optimum lead(II) adsorption at pH 8 and contact time of 150 minute with adsorption capacity of 19,39 mg/g and percentage of adsorption 97%. The adsorption performance of lead(II) on fulvic acid functionalized magnetite is very effective and higher than lead(II) adsorption on magnetite alone.
AIP Conference Proceedings
The degradation of dyestuffs by the photocatalysis method is fascinating because it is simple and... more The degradation of dyestuffs by the photocatalysis method is fascinating because it is simple and reduces the quantity of new waste generated during the process. The purpose of this study is to use a Zn-Fe 3 O 4 /WO 3 composite to photocatalyst the degradation of methylene blue as a model organic pollutant. X-ray Diffraction (XRD) and scanning electron microscope (SEM) were used to examine the catalyst's properties. The XRD investigation confirmed the presence of a composite structure of Zn-Fe 3 O 4 /WO 3. The morphological particles of Zn-Fe 3 O 4 /WO 3 are non-uniform and tend to agglomerate, as evidenced by the SEM image. The optimal conditions of the photocatalytic process were 50 mL methylene blue (10 ppm), 0.2 g weight of Zn-Fe 3 O 4 /WO 3 catalyst, and a contact time of 30 minutes, which resulted in an 81.38 % degradation.
AIP Conference Proceedings
The rapid development of the textile industry in Indonesia has increased the need for dyes. Meanw... more The rapid development of the textile industry in Indonesia has increased the need for dyes. Meanwhile, magnetite nanoparticles are widely used due to their large adsorption capacity, nano-sized with a wider surface area, non-toxic, biodegradable, and easily separated due to their magnetic properties. Therefore, this study aims to examine the preparation and characterization of fulvic acid-coated magnetite nanoparticles (MnP-FA) and their application for methylene blue (MB) adsorption with variations in pH, contact time, and concentration. The extraction of FA from peat soil in Samboja, East Kalimantan under alkaline conditions and then coated with MnP using the coprecipitation method. FTIR characteristics result of MnP-FA was shown the interaction of the carboxyl group on FA with the Fe-O surface on MnP, loss of C-H deformation at 1404 cm-1, and a shift in the C-H carboxylate group at 1126 cm-1. MnP-FA diffractogram did not change the crystal structure compared to MnP, and SEM image MnP-FA showed that the morphology is a smooth surface with non-uniform size attached to the spherical MnP. The magnetic property decreased after the addition of FA but is still attracted by an external magnet. Adsorption of methylene blue using MnP-FA was optimum at pH 7 with a contact time of 30 minutes, adsorption capacity (Qa) of 2.20 mg/g, and adsorption percentage of 56.%. The results showed that the capacity of MnP-FA was almost the same as that of MnP but the contact time was more effective for methylene blue adsorption. The results showed that the adsorption capacity of MnP-FA was greater than MnP and contact time was faster for methylene blue adsorption.
Modification adsorbent of magnetite (Fe 3 O 4) coated humic acids (HA) by a co-precipitation meth... more Modification adsorbent of magnetite (Fe 3 O 4) coated humic acids (HA) by a co-precipitation method using ammonium hydroxide have been successfully synthesized. The characterization of FT-IR spectra indicate that the coating Fe3O4/HA have been bound by Fe-COO-R and the XRD patterns does not have effect of the crystals structure. It's applications to degrade of heavy metal Cu and Cr from liquid waste on plywood industries. Degradation of Cu on Fe 3 O 4 /HA and Fe 3 O 4 i.e up 70-90% and then for Cr on Fe 3 O 4 /HA and Fe 3 O 4 i.e 10-40% only. The performance adsorbent of Fe 3 O 4 /HA more effectively than Fe 3 O 4 for degradation of heavy metal Cu and Cr.
Seminar Nasional Pengabdian Kepada Masyarakat (SEPAKAT), Nov 8, 2021
PROSIDING SEMINAR KIMIA, Oct 3, 2021
Procedia Environmental Sciences, 2015
Magnetite nanoparticles (Fe 3 O 4) coated humic acids (HA) by a co-precipitation method using amm... more Magnetite nanoparticles (Fe 3 O 4) coated humic acids (HA) by a co-precipitation method using ammonium hydroxide. The HA was extracted from peat soil of Sambutan, East Kalimantan, Indonesia and then have been succesfully coated onto the surface of Fe 3 O 4. Characterization of FT-IR spectra indicate that the coating Fe 3 O 4 /HA have been bound by Fe-COOR chemical bond. The XRD measurements does not affect the crystals structure. Scanning electron microscopy revealed the magnetic particle size is almost homogenous of 10-18 nm. Both of Fe 3 O 4 and the coating Fe 3 O 4 /HA were of the cubic spinel structure and sphericalshaped morphology. The modification of HA on Fe 3 O 4 can decrease the saturation magnetization from 71.3 emu/g to 69.5 emu/g.
JURNAL ATOMIK, Mar 31, 2021
Magnetite is widely used in various fields of separation, biochemistry, medical and environment. ... more Magnetite is widely used in various fields of separation, biochemistry, medical and environment. Modification of nanoparticle magnetite binding with chitosan is recommended for many biomedical applications, especially as a drug delivery system because in addition to its non-toxic, biodegradable and biocompatible characteristics. Another advantage of biomedical benefits as antimicrobial is that it can increase antibacterial activity and has a more pronounced effect on gram-negative and gram-positive bacteria. Synthesis and characterization of chitosan-magnetite cross-linked tripolyphosphate as an antibacterial of S. typhi (Gram negative) and S. aureus (Gram positive) has been carried out. The phase of this research was initiated by the synthesis of FeSO4.7H2O and FeCl3.6H2O magnetite with a mass ratio of Fe (II): Fe (III) = 2: 3, using the co-precipitation method. In the second stage where the cross-linking of chitosan with TPP cross-linker to form ferrogel. In the third stage the synthesis of TPP-chitosan-magnetite in a ratio of 1: 4, with a slight addition of NH4OH as participant material. The results showed that FT-IR on TPP-chitosan-magnetite has a unique spectrum, XRD results showed the crystal structure of TPP-chitosan-magnetite did not change. Surface morphology shows that TPP-chitosanmagnetite is a spherical surface. Chitosan-Magnetite material has greater antibacterial activity than chitosan and magnetite bacteria S. typhi (Gram negative) and S. aureus (Gram positive).
Jurnal Kimia Sains dan Aplikasi, 2022
Humic acid-modified magnetite nanoparticle (MnP-HA) has been synthesized using the co-precipitati... more Humic acid-modified magnetite nanoparticle (MnP-HA) has been synthesized using the co-precipitation method and applied for removal of [AuCl4]−. Modifying of MnP-HA was prepared with the mass ratio of MnP-HA=10:1 and 10:3. The HA was extracted from peat soil of Sambutan Village, East Kalimantan, Indonesia, by the recommended procedure of the International Humic Substances Society (IHSS). The saturation magnetization of MnP-HA was decreased compared to unmodified MnP. The interaction between MnP and HA was occurred due to the chemical bond between Fe from MnP with the carboxylic group from HA. The coating HA on the surface of MnP unchanged the formation of the crystal structure of MnP and increased the particle size. The optimum removal of [AuCl4]− on MnP and MnP-HA materials was optimum at pH 3.0. The Langmuir isotherm model with sorption capacity was 0.23, 4.85, and 4.65 mol g–1 for MnP, MnP-HA=10:1, and 10:3, respectively. Using a pseudo-second-order equation, the degradation of th...
The modification of cellulose with 2-mercaptobenzhotiazole (MBT) through grafting and impregnatin... more The modification of cellulose with 2-mercaptobenzhotiazole (MBT) through grafting and impregnating methods has been done. Modified cellulose used as adsorbent for Cu(II) ion in aqueous solution. The aims of research were modification cellulose with 3-chloropropyltrimethoxysilane and 2-mercaptobenzhotiazole (MBT), characterization of the modified cellulose with FTIR, SEM and XRD and adsorption study between cellulose-MBT adsorbent with Cu(II) ion in aqueous solution. The adsorbent of cellulose-MBT was synthesized by reflux process. Adsorption study between cellulose-MBT adsorbent with Cu(II) ion was investigated based on influence of pH solution, interaction time and initial concentration of Cu(II) ion. The result showed that activated cellulose can be modified with MBT to become cellulose-MBT adsorbent. The functional group of –C=N appeared at wavenumber 1658 cm-1 attributed to functional group of-C=N- is Schiff base of MBT. Presence functional group of S-H at cellulose-MBT adsorben...
The adsorption kinetics of Cr(VI) by two adsorbents, i.e. magnetite (Fe 3 O 4 ) and magnetite coa... more The adsorption kinetics of Cr(VI) by two adsorbents, i.e. magnetite (Fe 3 O 4 ) and magnetite coated humic acids (Fe 3 O 4 /HA) have been studied. Adsorbent of Fe 3 O 4 and Fe 3 O 4 /HA were synthesized by co-precipitation method and then characterized by FT-IR, XRD and TEM image measurements. The acidity of the solution was adjusted to pH 3, comparasion on the adsorption kinetics of Cr(VI) on Fe 3 O 4 between Fe 3 O 4 /HA. The FT-IR spectra revealed the presence of main fuctional groups of Fe-O and C-O at free carboxylate acid in Fe 3 O 4 /HA and those of only Fe-O in Fe 3 O 4 . The two adsorbent had similar diffraction peaks at 2θ. The TEM image demonstaretd that Fe 3 O 4 were spherical in shape and uniform distribution and then Fe 3 O 4 /HA had no uniform size. Adsorption of Cr(VI) by Fe 3 O 4 was much faster than Fe 3 O 4 /HA at the acidity of pH 3, with adsorption rate constant (k) of 0.013 g.mg -1 .menit -1 for Fe 3 O 4 and 0.0062 g.mg -1 .menit -1 for Fe 3 O 4 /HA. The two ad...
Selulase merupakan enzim hidrolase yang dapat menghidrolisa selulosa pada ikatan13-1,4—glikosida ... more Selulase merupakan enzim hidrolase yang dapat menghidrolisa selulosa pada ikatan13-1,4—glikosida menghasilkan glukosa Telah dilakukan isolasi dan karaktetisasi enzim selulase dari eairan rumen sapi un¬tuk hidrolisaserbuk gergajian kayu. Ekstrak kasar basil isolasi diuji aktivitas terlebih dahulu pada substrat tertentu dengan tujuan untuk mengetahui jenis enzim yang berperan. Pemurnian dilakukan dengan fraksinasi (NH4)2SO4bertingkat, yakni Fl (0-10%), F2 (10-20%), F3 (20-40A) , F4 (40-60%), F5 (60-80%) dan F6 (80-100%) dilanjutkan sentrifugasi dan dialisis. Jumlah glukosa yang dihasilkan diuji dengan metode Nel¬sou-Somogyi dan diukur absorbansinya pada : 440 urn serta kadar protein diteutu¬kan dengan metode lowry dan diukur absorbansinya. pada : 640 urn menggunakan spektrofotometer uv-vis. Karakterisasi dilakukan pada fraksi enzim dengan aktivitas tertinggi dengan pada kondisi pH, suhu dan waktu inkubasi tertentu. Kondisi optimum yang diperoleh dipakai untuk hidrolisa selulosa dari s...
International Journal of Scientific & Technology Research, 2019
This research studies the effectiveness of TPH bioremediation in oil-exposed soils using E. coli ... more This research studies the effectiveness of TPH bioremediation in oil-exposed soils using E. coli and Klebsiella sp with the addition of urea fertilizer, NPK-Mg 12-12-17 + 2 (N; P; K; Mg = 12%; 12%; 12 %; 2%) and NPK 15-15-15 (N; P; K = 15%; 15%; 15%). The bioremediation process lasts for 3-27 days and during the bioremediation process the TPH level is checked every 72 hours using the InfraCal TPH Analyzer. The results showed that there was an influence on the use of inorganic fertilizers on the length of the bioremediation process, this is because inorganic fertilizers such as urea fertilizer, NPK 12-12-17 + 2 and NPK 15-15-15 contain nutrients needed by bacteria during the bioremediation process so that the bacteria grows optimally. Inorganic fertilizers also affect soil conditions which can cause the bioremediation process to take place faster. The data of this study indicated that the optimal bioremediation conditions were achieved at the highest TPH concentration compared to oth...
Synthesis of humic acid (HA) coated Fe3O4magneticnanoparticles(Fe3O4/HA) were conducted to produc... more Synthesis of humic acid (HA) coated Fe3O4magneticnanoparticles(Fe3O4/HA) were conducted to produce materials for adsorption of Cu(II). The HA was extracted from peat soil of Sambutan, East Kalimantan and the coating of Fe3O4/HA wasperformedbyco-precipitation procedure using ammonium hydroxide. The prepared adsorbent was characterized by FT-IR spectroscopy, and it’s found that the spectrum consist of functional groups of COOH, OH and FeO. The XRD patterns of Fe3O4/HA and Fe3O4 have similar diffraction peaks, It indicates that the coating agent does not affect the crystals structure. The TEM images of Fe3O4/HA shows that the materials were in quasi-spherical shape and had the particle size is almost homogeneous. Adsorption of metal ion Cu(II) by Fe3O4/HA was stable in acid condition at pH 3.0 to 5.0, giving maximum adsorption capacity 2.198 mmol/g at pH 5.0. Adsorption at pH 5.0 during 30 minutes was able removes Cu(II) up to more than 95% The Langmuir of adsorption energy of Fe3O4/HA...