Jalil Baari - Academia.edu (original) (raw)

Papers by Jalil Baari

Research paper thumbnail of 1H and 13C NMR Study of Oligosuccinimide Prepared by Thermal Condensation and Evaluation of Its Scale Inhibition

JKPK (Jurnal Kimia dan Pendidikan Kimia)

The presence of scale is a serious problem in the petroleum industry, and some efforts should be ... more The presence of scale is a serious problem in the petroleum industry, and some efforts should be made to control scale formation. Oligosuccinimide (OSI) is an oligomer with several repeating units of succinimide. The structure of the OSI main chain and end groups has never been comprehensively analyzed. Meanwhile, OSI is potentially a scale inhibitor due to chelating properties, high polarity, and high solubility. This study investigates the molecular structure of oligosuccinimide, focusing on the main chain and end groups. Synthesis was carried out by thermal condensation between maleic anhydride and ammonium carbonate using a 1H and 13C NMR spectroscope equipped with Distortionless Enhancement by Polarization Transfer 135, Heteronuclear Multiple Quantum Coherence, and Single Quantum Coherence. The NMR analysis results detected the presence of the main chain and several synthesized OSI end groups, such as the amino, succinimide, and maleimide end groups. However, the dicarboxylic a...

Research paper thumbnail of Performance of Sediment Microbial Fuel Cells in Generating Electricity using Fish Wastewater and Shrimp Wastewater as a Nutrient and Their Effect on Waste Quality

International Journal of Science, Technology & Management

Sediment Microbial Fuel Cell (MFC) is a technology that can convert chemical energy into electric... more Sediment Microbial Fuel Cell (MFC) is a technology that can convert chemical energy into electrical energy through the process of nutrient degradation by microbes. Sediment taken from the bottom of shrimp ponds was added as a source of microbes, while fish and shrimp wastewater were used as a source of nutrients for microbes. This study aims to measure the performance of the SMFC system on fish effluent and shrimp effluent to produce bio-electricity while reducing the waste load. The research method was experimental laboratories. The treatment given was the different types of electrodes, namely zinc-copper and aluminum-copper. In addition, 0.2 M KMnO4 electrolyte solution was used. This study consisted of four stages: the manufacture of nutrients from fish and shrimp wastewater, the manufacture of a dual chamber MFC bioreactor, the measurement of electrical values, and the analysis of waste quality. Experiments were carried out for 30 days by measuring electricity every 24 hours. Th...

Research paper thumbnail of Studi Pemanfaatan Limbah Cair Ikan dan Udang sebagai Substrat dalam Produksi Listrik pada Sistem Microbial Fuel Cell (MFC)

Kovalen: jurnal riset kimia, Dec 29, 2022

Microbial fuel cell (MFC) is a technology that utilizes bacteria in organic medium that can conve... more Microbial fuel cell (MFC) is a technology that utilizes bacteria in organic medium that can convert chemical energy into electrical energy. This technology can be used to treat fishery waste and shrimp waste which is rich in organic matter. This study aimed to measure the performance of the MFC system on fishery wastewater and shrimp wastewater as a means of producing bio-electricity while reducing the waste load. This study used different types of electrodes, including zinc, aluminum, copper, and carbon graphite. This technology used 0.2 M KMNO4 electrolyte solution. The research method includes three stages; production of fishery wastewater and shrimp wastewater, assembly of a dual chamber MFC bioreactor, and measurement of waste electrical energy produced. The value of electricity production with the highest average in fishery wastewater was obtained by adding electrolyte solution to the Zn/Cu electrode during 117 hours of observation were 6.86 mA with a potential difference of 1.469 V meanwhile in shrimp wastewater was obtained by adding electrolyte solution to the Al/Cu electrode were 4.38 mA with a potential difference of 1.335 V.This study can be concluded that higher electricity production is obtained from the utilization of fish wastewater using Zn/Cu electrode.

Research paper thumbnail of Inventarisasi dan Penanaman Bibit Tanaman Obat Bagi Masyarakat di Kelurahan Mangolo, Kabupaten Kolaka

Jurnal Mandala Pengabdian Masyarakat

Pemanfaatan tanaman obat secara tradisional oleh masyarakat Kolaka telah berlangsung selama turun... more Pemanfaatan tanaman obat secara tradisional oleh masyarakat Kolaka telah berlangsung selama turun-temurun. Namun, hingga saat ini upaya pembinaan asuhan mandiri pemanfaatan taman obat keluarga masih belum giat dilakukan. Sebagai langkah awal program pembinaan, pengabdian ini bertujuan untuk menginventarisasi dan menanam bibit tanaman obat yang digunakan oleh masyarakat di Kelurahan Mangolo yang secara geografis merupakan wilayah taman wisata alam Kolaka. Kegiatan yang dilakukan meliputi survei potensi wilayah, identifikasi permasalahan, koordinasi dan perizinan, inventarisasi tanaman obat, pelatihan pembuatan pupuk alami, perbanyakan bibit dan pemeliharaan tanaman obat, penanaman bibit secara serentak, monitoring, dan evaluasi kegiatan. Kegiatan pengabdian menghasilkan inventarisasi tanaman obat sebanyak 49 tanaman dan penanaman bibit tanaman obat sebanyak 297 bibit oleh masyarakat Kelurahan Mangolo. Melalui kegiatan ini, masyarakat memperoleh pengetahuan, keterampilan, dan motivasi...

Research paper thumbnail of Effectiveness of Reducing Cyanide Levels in The Dioscorea hispida Dennst Bulbs Through Soaking in Seawater and Interaction with Ash scrub

Journal of Physics: Conference Series, 2020

The high concentration of cyanide in Dioscorea hispida dennst should be reduced through immersion... more The high concentration of cyanide in Dioscorea hispida dennst should be reduced through immersion in seawater and interaction with rubbing ash. Soaking seawater prepared in immersion time 12, 24, and 36 hours accompanied by the replacement of seawater every three hours, while interaction with rubbing ash was ready with 75% and 100% concentration of ash on 12, 24, and 36 hours of storage time respectively. Measurement of cyanide concentrations of Dioscorea hispida dennst samples was prepared by argentometry titration with Liebig method after through the steam distillation process. Based on the results of this study, it found that immersion time for 12, 24, and 36 hours could reduce cyanide concentrations about 48.30%, 64.44%, and 70.88%, respectively. The interaction by using 75% rubbing ash for 12, 24, and 36 hours, it can reduce 24.09%, 38.69%, and 51.42% cyanide concentration in Dioscorea hispida dennst tubers, respectively. The Dioscorea hispida dennst tubers smeared with100% rub...

Research paper thumbnail of The oligosuccinimide and modified polysuccinimide as green corrosion and scale inhibitors

Chimica Techno Acta

Corrosion and scale formation are crucial issues in the petroleum industry. They can inflict meta... more Corrosion and scale formation are crucial issues in the petroleum industry. They can inflict metal or other materials breakdown, leading to environmental pollution. Applying scale and corrosion inhibitors is a cost-effective and efficient way of controlling corrosion and scale formation in a fluid system. Much research has been conducted to obtain cheap and safe corrosion or scale inhibitors. Modified polysuccinimides (PSI) are among the organic compounds reported as effective and environmentally friendly corrosion as well as scale inhibitors. The use of various novel green corrosion and scale inhibitors from modified PSI for controlling corrosion reactions or scale formation has not been extensively reviewed. Hence, this review highlights recent studies on preparing PSI/OSI, modifying PSI, and analyzing their performance as corrosion and scale inhibitors. Adsorption study, biodegradation performance, computational quantum study, limitations, and prospects of the inhibitors are also...

Research paper thumbnail of Application of Carbon Dots as Corrosion Inhibitor: A Systematic Literature Review

Indonesian Journal of Chemistry

Corrosion is spontaneity and unavoidable reactions which cause degradation in the quality of the ... more Corrosion is spontaneity and unavoidable reactions which cause degradation in the quality of the materials. Most industries have been harmed by the corrosion of manufacturing equipment. Several methods can be applied to control this problem. The use of corrosion inhibitors is an effective and practical way to decrease metal deterioration significantly. Many commercial inorganic and organic compounds are effective inhibitors, but most of them are not completely safe and relatively expensive. Carbon dots and their derivatives are potential compounds for resolving corrosion reactions on metal surfaces. Carbon dots can be synthesized from various natural sources to be more environmentally friendly. This systematic review aims to summarize the concept of corrosion, types of carbon dots-based corrosion inhibitor and their effectiveness on various metals, inhibition mechanism, surface analysis of the protected metals, kinetics, thermodynamics, and quantum computational chemistry studies. T...

Research paper thumbnail of Application of Poly(Ethyl Eugenyl Oxyacetate) Compounds as the Ions Carrier for Heavy Metals Separation and Separation of Fe and Ni in Ferronickel Using Liquid Membrane Transport Method

Indonesian Journal of Chemistry

Poly(ethyl eugenyl oxyacetate) (PEEOA) had been synthesized for separating heavy metals like Fe(I... more Poly(ethyl eugenyl oxyacetate) (PEEOA) had been synthesized for separating heavy metals like Fe(III), Cr(III), Cu(II), Ni(II), Co(II), and Pb(II) by liquid membrane transport method. The effects of pH, ion carrier volume, stripping concentration, transport time, and metal ion concentration were investigated to obtain optimum conditions. Experimental results showed that optimum pH occurred at pH 4 for Fe(III) ions and pH 5 for others. Carrier volumes were optimum at 8.5 mL for Fe(III) and Pb(II) ions but 7.5 mL for others. The optimum concentrations of the stripping phase were 2 M for Fe(III) and Cu(II) ions, 1 M for Cr(III), Ni(II), Co(II) ions, and 0.5 M for Pb(II) ion. Transport times were optimum at 36 h for Fe(III) and Co(II) ions and 48 h for others. The optimum metal ion concentrations were 0.25 mM for Fe(III) and Cr(III) ions, while other ions were 0.1 mM. The response of PEEOA to Fe(III) ion was the best with selectivity order, Fe(III) > Cr(III) > Pb(II) > Cu(II) &g...

Research paper thumbnail of Synthesis of Oligosuccinimide and Evaluation of Its Corrosion Inhibition Performance on Carbon Steel in CO2-Saturated 1% NaCl Solution

Journal of Mathematical and Fundamental Sciences, 2020

Oligosuccinimide (OSI) is an oligomer with several repeating units of succinimide. In this study,... more Oligosuccinimide (OSI) is an oligomer with several repeating units of succinimide. In this study, OSI was synthesized by thermal condensation between maleic anhydride and ammonium carbonate. The chemical structure of the synthesized compound was confirmed by FTIR and NMR spectroscopy as well as LC-MS characterization. Evaluation of its performance as corrosion inhibitor and the adsorption mechanism on a carbon steel surface in CO2saturated 1% (w/v) NaCl solution was performed using electrochemical techniques (electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization) and weight-loss methods. These tests were simultaneously carried out for all fractions without separation. The EIS results showed that the inhibition efficiency (IE) of the OSI increased with increasing concentration but decreased at higher temperatures. The potentiodynamic polarization data indicated that the OSI acted as a mixed inhibitor. Adsorption of OSI on the carbon steel generally obeys the Langmuir adsorption isotherm according to curve linearity, which relates the degree of surface coverage to the inhibitor concentration. The standard Gibbs free energy of the adsorption values (∆) were negative within the range of −33.14 to −38.73 kJ.mol-1 , which indicates the spontaneity of the adsorption process on the carbon steel surface and that OSI molecules interacted with the carbon steel through semi-physisorption.

Research paper thumbnail of Performance of N,O-Carboxymethyl Chitosan as Corrosion and Scale Inhibitors in CO2 Saturated Brine Solution

Indonesian Journal of Chemistry, 2021

The presence of salts and dissolved gas like CO2 that is carried with natural gas and crude oil a... more The presence of salts and dissolved gas like CO2 that is carried with natural gas and crude oil along the pipeline is the main reason for corrosion and scale formation. These problems are usually resolved separately by corrosion inhibitors and scale inhibitors or acidification. Meanwhile, utilizing a compound to resolve both corrosion and scale formation has an advantage in the economic side and working time. N,O-carboxymethyl chitosan or N,O-CMCs is one of the chitosan's derivates. It is water-soluble and has different functional groups. Those properties support its capability as a complexing agent on corrosion and scale inhibitors. Synthesis of N,O-CMCs was carried out by chemical reactions between chitosan and chloroacetic acid under alkaline circumstances. N,O-CMCs product was characterized using FT-IR and 1H-NMR spectroscopy. The inhibition efficiency was analyzed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. The measurements s...

Research paper thumbnail of A Review on Expired Drug-Based Corrosion Inhibitors: Chemical Composition, Structural Effects, Inhibition Mechanism, Current Challenges, and Future Prospects

Indonesian Journal of Chemistry, 2021

This comprehensive review highlighted how the expired drugs manage corrosion reactions on metal/a... more This comprehensive review highlighted how the expired drugs manage corrosion reactions on metal/alloy surfaces, especially types of carbon/mild steel, Sabic iron, copper, and aluminium in NaCl or acid solution. Several types of expired drugs and the optimum conditions presented in this review were summarized from relevant studies. The performance of expired drugs which covers inhibition efficiency, inhibition mechanisms, and metal surface analysis was informed. The contribution of the chemical composition, molecular structure, compatible treatment conditions, and some corrosion analysis methods were mentioned. Current challenges and future prospects were also discussed for further investigations and developments to obtain superior inhibitors and save the environment.

Research paper thumbnail of Fabrication of Chitosan/Fe3O4 Nanocomposite as Adsorbent for Reduction Methylene Blue Contents

Indonesian Journal of Chemistry

Methylene blue (MB) is a dye in wastewater from textile industries that pollutes the water enviro... more Methylene blue (MB) is a dye in wastewater from textile industries that pollutes the water environment. Reduction of its content is necessary for protecting humans and the surrounding environment. This study fabricated chitosan/Fe3O4 nanocomposite through the mixture of chitosan from crab shell waste and magnetite (Fe3O4) from local sand iron with sodium tripolyphosphate (STPP)-sulfate crosslinker as an adsorbent to reduce methylene blue content. The obtained composite was characterized by Fourier Transform Infrared (FTIR) Spectrophotometer and X-Ray Diffraction (XRD) instrument. The contents of methylene blue before and after applying adsorbent-based nanocomposite were determined using an ultraviolet-visible (UV-Vis) spectrophotometer. FTIR characterization results show that chitosan and chitosan/Fe3O4 nanocomposite had successfully synthesized based on the typical vibrational peaks. The deacetylation degree of chitosan was 69.79%. Fe3O4, and chitosan/Fe3O4 nanocomposite, were conf...

Research paper thumbnail of 1H and 13C NMR Study of Oligosuccinimide Prepared by Thermal Condensation and Evaluation of Its Scale Inhibition

JKPK (Jurnal Kimia dan Pendidikan Kimia)

The presence of scale is a serious problem in the petroleum industry, and some efforts should be ... more The presence of scale is a serious problem in the petroleum industry, and some efforts should be made to control scale formation. Oligosuccinimide (OSI) is an oligomer with several repeating units of succinimide. The structure of the OSI main chain and end groups has never been comprehensively analyzed. Meanwhile, OSI is potentially a scale inhibitor due to chelating properties, high polarity, and high solubility. This study investigates the molecular structure of oligosuccinimide, focusing on the main chain and end groups. Synthesis was carried out by thermal condensation between maleic anhydride and ammonium carbonate using a 1H and 13C NMR spectroscope equipped with Distortionless Enhancement by Polarization Transfer 135, Heteronuclear Multiple Quantum Coherence, and Single Quantum Coherence. The NMR analysis results detected the presence of the main chain and several synthesized OSI end groups, such as the amino, succinimide, and maleimide end groups. However, the dicarboxylic a...

Research paper thumbnail of Performance of Sediment Microbial Fuel Cells in Generating Electricity using Fish Wastewater and Shrimp Wastewater as a Nutrient and Their Effect on Waste Quality

International Journal of Science, Technology & Management

Sediment Microbial Fuel Cell (MFC) is a technology that can convert chemical energy into electric... more Sediment Microbial Fuel Cell (MFC) is a technology that can convert chemical energy into electrical energy through the process of nutrient degradation by microbes. Sediment taken from the bottom of shrimp ponds was added as a source of microbes, while fish and shrimp wastewater were used as a source of nutrients for microbes. This study aims to measure the performance of the SMFC system on fish effluent and shrimp effluent to produce bio-electricity while reducing the waste load. The research method was experimental laboratories. The treatment given was the different types of electrodes, namely zinc-copper and aluminum-copper. In addition, 0.2 M KMnO4 electrolyte solution was used. This study consisted of four stages: the manufacture of nutrients from fish and shrimp wastewater, the manufacture of a dual chamber MFC bioreactor, the measurement of electrical values, and the analysis of waste quality. Experiments were carried out for 30 days by measuring electricity every 24 hours. Th...

Research paper thumbnail of Studi Pemanfaatan Limbah Cair Ikan dan Udang sebagai Substrat dalam Produksi Listrik pada Sistem Microbial Fuel Cell (MFC)

Kovalen: jurnal riset kimia, Dec 29, 2022

Microbial fuel cell (MFC) is a technology that utilizes bacteria in organic medium that can conve... more Microbial fuel cell (MFC) is a technology that utilizes bacteria in organic medium that can convert chemical energy into electrical energy. This technology can be used to treat fishery waste and shrimp waste which is rich in organic matter. This study aimed to measure the performance of the MFC system on fishery wastewater and shrimp wastewater as a means of producing bio-electricity while reducing the waste load. This study used different types of electrodes, including zinc, aluminum, copper, and carbon graphite. This technology used 0.2 M KMNO4 electrolyte solution. The research method includes three stages; production of fishery wastewater and shrimp wastewater, assembly of a dual chamber MFC bioreactor, and measurement of waste electrical energy produced. The value of electricity production with the highest average in fishery wastewater was obtained by adding electrolyte solution to the Zn/Cu electrode during 117 hours of observation were 6.86 mA with a potential difference of 1.469 V meanwhile in shrimp wastewater was obtained by adding electrolyte solution to the Al/Cu electrode were 4.38 mA with a potential difference of 1.335 V.This study can be concluded that higher electricity production is obtained from the utilization of fish wastewater using Zn/Cu electrode.

Research paper thumbnail of Inventarisasi dan Penanaman Bibit Tanaman Obat Bagi Masyarakat di Kelurahan Mangolo, Kabupaten Kolaka

Jurnal Mandala Pengabdian Masyarakat

Pemanfaatan tanaman obat secara tradisional oleh masyarakat Kolaka telah berlangsung selama turun... more Pemanfaatan tanaman obat secara tradisional oleh masyarakat Kolaka telah berlangsung selama turun-temurun. Namun, hingga saat ini upaya pembinaan asuhan mandiri pemanfaatan taman obat keluarga masih belum giat dilakukan. Sebagai langkah awal program pembinaan, pengabdian ini bertujuan untuk menginventarisasi dan menanam bibit tanaman obat yang digunakan oleh masyarakat di Kelurahan Mangolo yang secara geografis merupakan wilayah taman wisata alam Kolaka. Kegiatan yang dilakukan meliputi survei potensi wilayah, identifikasi permasalahan, koordinasi dan perizinan, inventarisasi tanaman obat, pelatihan pembuatan pupuk alami, perbanyakan bibit dan pemeliharaan tanaman obat, penanaman bibit secara serentak, monitoring, dan evaluasi kegiatan. Kegiatan pengabdian menghasilkan inventarisasi tanaman obat sebanyak 49 tanaman dan penanaman bibit tanaman obat sebanyak 297 bibit oleh masyarakat Kelurahan Mangolo. Melalui kegiatan ini, masyarakat memperoleh pengetahuan, keterampilan, dan motivasi...

Research paper thumbnail of Effectiveness of Reducing Cyanide Levels in The Dioscorea hispida Dennst Bulbs Through Soaking in Seawater and Interaction with Ash scrub

Journal of Physics: Conference Series, 2020

The high concentration of cyanide in Dioscorea hispida dennst should be reduced through immersion... more The high concentration of cyanide in Dioscorea hispida dennst should be reduced through immersion in seawater and interaction with rubbing ash. Soaking seawater prepared in immersion time 12, 24, and 36 hours accompanied by the replacement of seawater every three hours, while interaction with rubbing ash was ready with 75% and 100% concentration of ash on 12, 24, and 36 hours of storage time respectively. Measurement of cyanide concentrations of Dioscorea hispida dennst samples was prepared by argentometry titration with Liebig method after through the steam distillation process. Based on the results of this study, it found that immersion time for 12, 24, and 36 hours could reduce cyanide concentrations about 48.30%, 64.44%, and 70.88%, respectively. The interaction by using 75% rubbing ash for 12, 24, and 36 hours, it can reduce 24.09%, 38.69%, and 51.42% cyanide concentration in Dioscorea hispida dennst tubers, respectively. The Dioscorea hispida dennst tubers smeared with100% rub...

Research paper thumbnail of The oligosuccinimide and modified polysuccinimide as green corrosion and scale inhibitors

Chimica Techno Acta

Corrosion and scale formation are crucial issues in the petroleum industry. They can inflict meta... more Corrosion and scale formation are crucial issues in the petroleum industry. They can inflict metal or other materials breakdown, leading to environmental pollution. Applying scale and corrosion inhibitors is a cost-effective and efficient way of controlling corrosion and scale formation in a fluid system. Much research has been conducted to obtain cheap and safe corrosion or scale inhibitors. Modified polysuccinimides (PSI) are among the organic compounds reported as effective and environmentally friendly corrosion as well as scale inhibitors. The use of various novel green corrosion and scale inhibitors from modified PSI for controlling corrosion reactions or scale formation has not been extensively reviewed. Hence, this review highlights recent studies on preparing PSI/OSI, modifying PSI, and analyzing their performance as corrosion and scale inhibitors. Adsorption study, biodegradation performance, computational quantum study, limitations, and prospects of the inhibitors are also...

Research paper thumbnail of Application of Carbon Dots as Corrosion Inhibitor: A Systematic Literature Review

Indonesian Journal of Chemistry

Corrosion is spontaneity and unavoidable reactions which cause degradation in the quality of the ... more Corrosion is spontaneity and unavoidable reactions which cause degradation in the quality of the materials. Most industries have been harmed by the corrosion of manufacturing equipment. Several methods can be applied to control this problem. The use of corrosion inhibitors is an effective and practical way to decrease metal deterioration significantly. Many commercial inorganic and organic compounds are effective inhibitors, but most of them are not completely safe and relatively expensive. Carbon dots and their derivatives are potential compounds for resolving corrosion reactions on metal surfaces. Carbon dots can be synthesized from various natural sources to be more environmentally friendly. This systematic review aims to summarize the concept of corrosion, types of carbon dots-based corrosion inhibitor and their effectiveness on various metals, inhibition mechanism, surface analysis of the protected metals, kinetics, thermodynamics, and quantum computational chemistry studies. T...

Research paper thumbnail of Application of Poly(Ethyl Eugenyl Oxyacetate) Compounds as the Ions Carrier for Heavy Metals Separation and Separation of Fe and Ni in Ferronickel Using Liquid Membrane Transport Method

Indonesian Journal of Chemistry

Poly(ethyl eugenyl oxyacetate) (PEEOA) had been synthesized for separating heavy metals like Fe(I... more Poly(ethyl eugenyl oxyacetate) (PEEOA) had been synthesized for separating heavy metals like Fe(III), Cr(III), Cu(II), Ni(II), Co(II), and Pb(II) by liquid membrane transport method. The effects of pH, ion carrier volume, stripping concentration, transport time, and metal ion concentration were investigated to obtain optimum conditions. Experimental results showed that optimum pH occurred at pH 4 for Fe(III) ions and pH 5 for others. Carrier volumes were optimum at 8.5 mL for Fe(III) and Pb(II) ions but 7.5 mL for others. The optimum concentrations of the stripping phase were 2 M for Fe(III) and Cu(II) ions, 1 M for Cr(III), Ni(II), Co(II) ions, and 0.5 M for Pb(II) ion. Transport times were optimum at 36 h for Fe(III) and Co(II) ions and 48 h for others. The optimum metal ion concentrations were 0.25 mM for Fe(III) and Cr(III) ions, while other ions were 0.1 mM. The response of PEEOA to Fe(III) ion was the best with selectivity order, Fe(III) > Cr(III) > Pb(II) > Cu(II) &g...

Research paper thumbnail of Synthesis of Oligosuccinimide and Evaluation of Its Corrosion Inhibition Performance on Carbon Steel in CO2-Saturated 1% NaCl Solution

Journal of Mathematical and Fundamental Sciences, 2020

Oligosuccinimide (OSI) is an oligomer with several repeating units of succinimide. In this study,... more Oligosuccinimide (OSI) is an oligomer with several repeating units of succinimide. In this study, OSI was synthesized by thermal condensation between maleic anhydride and ammonium carbonate. The chemical structure of the synthesized compound was confirmed by FTIR and NMR spectroscopy as well as LC-MS characterization. Evaluation of its performance as corrosion inhibitor and the adsorption mechanism on a carbon steel surface in CO2saturated 1% (w/v) NaCl solution was performed using electrochemical techniques (electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization) and weight-loss methods. These tests were simultaneously carried out for all fractions without separation. The EIS results showed that the inhibition efficiency (IE) of the OSI increased with increasing concentration but decreased at higher temperatures. The potentiodynamic polarization data indicated that the OSI acted as a mixed inhibitor. Adsorption of OSI on the carbon steel generally obeys the Langmuir adsorption isotherm according to curve linearity, which relates the degree of surface coverage to the inhibitor concentration. The standard Gibbs free energy of the adsorption values (∆) were negative within the range of −33.14 to −38.73 kJ.mol-1 , which indicates the spontaneity of the adsorption process on the carbon steel surface and that OSI molecules interacted with the carbon steel through semi-physisorption.

Research paper thumbnail of Performance of N,O-Carboxymethyl Chitosan as Corrosion and Scale Inhibitors in CO2 Saturated Brine Solution

Indonesian Journal of Chemistry, 2021

The presence of salts and dissolved gas like CO2 that is carried with natural gas and crude oil a... more The presence of salts and dissolved gas like CO2 that is carried with natural gas and crude oil along the pipeline is the main reason for corrosion and scale formation. These problems are usually resolved separately by corrosion inhibitors and scale inhibitors or acidification. Meanwhile, utilizing a compound to resolve both corrosion and scale formation has an advantage in the economic side and working time. N,O-carboxymethyl chitosan or N,O-CMCs is one of the chitosan's derivates. It is water-soluble and has different functional groups. Those properties support its capability as a complexing agent on corrosion and scale inhibitors. Synthesis of N,O-CMCs was carried out by chemical reactions between chitosan and chloroacetic acid under alkaline circumstances. N,O-CMCs product was characterized using FT-IR and 1H-NMR spectroscopy. The inhibition efficiency was analyzed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. The measurements s...

Research paper thumbnail of A Review on Expired Drug-Based Corrosion Inhibitors: Chemical Composition, Structural Effects, Inhibition Mechanism, Current Challenges, and Future Prospects

Indonesian Journal of Chemistry, 2021

This comprehensive review highlighted how the expired drugs manage corrosion reactions on metal/a... more This comprehensive review highlighted how the expired drugs manage corrosion reactions on metal/alloy surfaces, especially types of carbon/mild steel, Sabic iron, copper, and aluminium in NaCl or acid solution. Several types of expired drugs and the optimum conditions presented in this review were summarized from relevant studies. The performance of expired drugs which covers inhibition efficiency, inhibition mechanisms, and metal surface analysis was informed. The contribution of the chemical composition, molecular structure, compatible treatment conditions, and some corrosion analysis methods were mentioned. Current challenges and future prospects were also discussed for further investigations and developments to obtain superior inhibitors and save the environment.

Research paper thumbnail of Fabrication of Chitosan/Fe3O4 Nanocomposite as Adsorbent for Reduction Methylene Blue Contents

Indonesian Journal of Chemistry

Methylene blue (MB) is a dye in wastewater from textile industries that pollutes the water enviro... more Methylene blue (MB) is a dye in wastewater from textile industries that pollutes the water environment. Reduction of its content is necessary for protecting humans and the surrounding environment. This study fabricated chitosan/Fe3O4 nanocomposite through the mixture of chitosan from crab shell waste and magnetite (Fe3O4) from local sand iron with sodium tripolyphosphate (STPP)-sulfate crosslinker as an adsorbent to reduce methylene blue content. The obtained composite was characterized by Fourier Transform Infrared (FTIR) Spectrophotometer and X-Ray Diffraction (XRD) instrument. The contents of methylene blue before and after applying adsorbent-based nanocomposite were determined using an ultraviolet-visible (UV-Vis) spectrophotometer. FTIR characterization results show that chitosan and chitosan/Fe3O4 nanocomposite had successfully synthesized based on the typical vibrational peaks. The deacetylation degree of chitosan was 69.79%. Fe3O4, and chitosan/Fe3O4 nanocomposite, were conf...