DR. MULIADI RAMLI , S.SI., M.SI (original) (raw)

Papers by DR. MULIADI RAMLI , S.SI., M.SI

Jurnal Natural/Jurnal natural, Feb 22, 2024

Journal of Physics: Conference Series, Aug 31, 2023

Journal of physics, Aug 31, 2023

Malacca Pharmaceutics, Mar 16, 2024

Heca Journal of Applied Sciences

This research aims to synthesize silver nanoparticles (AgNPs) using an aqueous leaf extract of Ca... more This research aims to synthesize silver nanoparticles (AgNPs) using an aqueous leaf extract of Calotropis gigantea obtained from the geothermal manifestation Ie Seu-Um, Aceh Besar, Aceh Province, Indonesia. The C. gigantea leaf extract was mixed with AgNO3 solutions at concentrations of 2, 5, and 9 mM, respectively. The mixture was stirred at 80 rpm by a magnetic stirrer for 48 hours in the dark. The change in solution color indicated the reduction of Ag+ to Ag0. The resulting AgNPs synthesized using C. gigantea leaf extract (AgNPs-LCg) exhibited cloudy grey, reddish dark brown, and light brown colors when synthesized with AgNO3 concentrations of 2, 5, and 9 mM, respectively. The particle sizes of AgNPs-LCg had maximum frequencies at 246.98 nm (synthesized using AgNO3 2 mM), 93.02 nm (synthesized using AgNO3 5 mM), and 171.25 nm (synthesized using AgNO3 9 mM). The zeta potential values of AgNPs-LCg using 2, 5, and 9 mM AgNO3 were -41.9, -40.1, and -31.4 mV, respectively. Based on th...

IOP conference series, Feb 1, 2021

The effect of Fe (II) and Mg (II) as matrix ions in the determination of Pb (II) based on 1,10-ph... more The effect of Fe (II) and Mg (II) as matrix ions in the determination of Pb (II) based on 1,10-phenanthroline complexing agent at pH 7 had been investigated. The objective of this study is to determine the effect of Fe (II) and Mg (II) on the determination of Pb (II) using the complexing agent 1,10-phenanthroline. The absorbance determination using a spectrophotometer was conducted at a wavelength of 302.5 nm for Pb (II)-1,10-Phenanthroline. Linear correlation between the investigated absorbance on Pb concentration was represented by a linear equation of y = 0.0131 x + 0.8693 (R2= 0.9613). From the linear equation, it was obtained the increase in sensitivity and linearity for Mg (II), as well as the decrease in sensitivity and linearity for Fe (II). It revealed that Fe (II) and Mg (II) affects the analysis of Pb (II) using 1,10-phenanthroline complexing agent. In order to achieve stability of Pb (II)-1,10-Phenanthroline, it was compared with Mg (II)-1,10-Phenanthroline and Fe (II)-1,10-Phenanthroline. It suggested that Pb (II), Mg (II) and Fe (II) had an equivalent binding strength against 1,10-Phenanthroline.

IOP conference series, Dec 11, 2019

IOP conference series, Feb 1, 2021

Neat chitosan membranes have shortcomings in their application owing to weak mechanical propertie... more Neat chitosan membranes have shortcomings in their application owing to weak mechanical properties, thus, requiring modification. In this study, a chitosan membrane was modified utilizing starch and cross-linking agent (citric acid) addition. The characterization of chitosan-starch membranes using Universal Testing Machine, Scanning Electron Microscope (SEM), Fourier Transform Infra-Red (FTIR), Differential Scanning Calorimetry (DSC), and Thermogravimetric Analysis (TGA) had proven the cross-linking formation. The cross-linked membrane had better tensile strength (11.07 kgf/mm2) than the uncross-linked membrane (66.07kgf/mm2). The DSC thermogram of uncross-linked and cross-linked membranes showed endothermic and exothermic peaks at different temperatures. In addition to the membranes’ thermal characteristics, the DTA thermogram showed the decomposition process on the uncross-linked membrane uncross-linking occurred at a temperature range of 277.74-363.27 °C, while the decomposition of the cross-linked membrane was observed at a range of 287.83-356.38 °C. The FT-IR spectra confirmed a decrease in the intensity of the absorption peak associated with cross-linking formation within the membrane.

Jurnal Natural, Mar 1, 2016

Membranes

This research has successfully fabricated ion selective electrode (ISE) for Pb2+ using castor oil... more This research has successfully fabricated ion selective electrode (ISE) for Pb2+ using castor oil (Ricinus communis L.)-based polyurethane (PU) membrane with 1,10-phenanthroline as the active agent. The sensitivity of the Pb2+ ISE obtained is 27.25 mV/decade with a linear range of [Pb(NO3)2] of 10−10–10−5 M and a coefficient of determination (R2) of 0.959. The system response reaches stability after 25 s of measurement. The Pb2+ has a detection limit of 10−10 M and gives a stable response at pH 7–8 with a 15-day lifetime. The investigation of the selectivity of the ISE was performed using the mixed solution method with log Kij values of <1. The selectivity order of Pb2+ ISE against the foreign ions is Ag2+ > Ca2+ > K+ > Mg2+ > Cu2+ > Fe3+ > Cr3+> Zn2+ > Cd2+. The Pb2+ ISE shows acceptable reproducibility and repeatability with standard deviation values of 0.065 and 0.0079, respectively. Fourier transform infrared (FT-IR) spectra confirmed that 1,10-phenant...

Analytical Letters, 2021

Abstract The Moringa oleifera tree, including the leaves, flowers, pods, and seeds, is highly nut... more Abstract The Moringa oleifera tree, including the leaves, flowers, pods, and seeds, is highly nutritious and useful for the prevention and control of various diseases. Here we have probed the micronutrients in Moringa oleifera leaves using laser-induced breakdown spectroscopy (LIBS). The time-resolved and time-integrated LIBS data reveal the presence of Ca, Mg, K, C, Si, Fe, Al, Ti, Sr, Na, H, O, and Li. The plasma temperature and electron number density required for the elemental composition analysis were estimated to be (6375 ± 500) K from the Saha-Boltzmann plot and (1.0 ± 0.2) 1017 cm−3 from the Stark broadened Hα line, respectively. Elemental analysis of the samples was performed using one-line calibration free LIBS (CF-LIBS). The results reveal that C is the major element together with Ca, Mg, K, Fe Na, Al, Ti, Sr, and Li as micronutrients. The concentrations of the micronutrients determined by CF-LIBS were validated by inductively coupled plasma – optical emission spectrometry (ICP-OES). LIBS has been demonstrated to be a practical candidate for the detection of potentially toxic elements (Li, Al, Si, and Sr) as well as for the compositional analysis.

IOP Conference Series: Earth and Environmental Science, 2022

The use of Calotropis gigantea from Ie Seu-Um, Aceh Besar geothermal area for silver nanoparticle... more The use of Calotropis gigantea from Ie Seu-Um, Aceh Besar geothermal area for silver nanoparticles (AgNPs) synthesized has been reported. The process of synthesis AgNPs can be carried out with chemical methods, physical methods, and green synthesis methods, but in this study, the process is focused on the green synthesis method using C. gigantea flowers and leaves extract from Ie Seu-Um geothermal area, Aceh Besar. Phytochemical analysis showed that C. gigantea leaves contain alkaloids, steroids, tannins, phenolics, and saponins, while the flowers of C. gigantea contain alkaloids, terpenoids, steroids, flavonoids, tannins, phenolics, and saponins. The reaction of the AgNPs formation was observed by colour change formed. AgNPs-C. gigantea flower extract dan AgNPs-C. gigantea leaves extract showed the reddish-brown and brownish-yellow solution respectively after 48 h incubation in dark condition at room temperature. The result of the reaction characterized using UV-Vis Spectrophotomet...

IOP Conference Series: Materials Science and Engineering, 2020

Hematite containing activated carbon (AC/α-Fe2O3) nanocomposite has been prepared by hydrothermal... more Hematite containing activated carbon (AC/α-Fe2O3) nanocomposite has been prepared by hydrothermal method and used as photocatalyst for removing tartrazine dye. Hematite was extracted from iron sand while activated carbon was derived from coffee waste which was activated using hydrochloric acid. The structure and morphology of photocatalyst was characterized by means of X-ray diffraction (XRD), nitrogen adsorption-desorption (BET) and Scanning Electron Microscopy-Energy-Dispersive X-Ray Spectroscopy (SEM-EDS). These techniques indicate that the AC/α-Fe2O3 nanocomposite has an average crystallite size of 35.47 nm and specific surface area of 41.52 m2/g. The photocatalytic activity evaluation showed that various factors influencing the removal of tartrazine dye including pH of dye solution, photocatalyst dosage, dye concentration and irradiation time. The results showed that AC/α-Fe2O3 nanocomposite can remove tartrazine up to 91.01% under UV light and 93.69% under solar light which we...

IOP Conference Series: Earth and Environmental Science, 2019

This research aims to identify Aceh, Bali and Brahman cattle bones using Fourier-Transform Infrar... more This research aims to identify Aceh, Bali and Brahman cattle bones using Fourier-Transform Infrared (FTIR) spectroscopy combined with chemometrics through Principal Component Analysis (PCA). Cattle bone samples were obtained from Lambaro and Lampulo raditional market in Aceh Besar. Firstly, each bone sample was analyzed using FTIR and then followed by FTIR spectra analysis using PCA. FTIR spectra showed that inorganic samples produced from these cattle bones consisting of hydroxyl, carbonate and phosphate functional groups. Further inspection using the PCA plot, the cattle bones were separated into three groups with its difference of 90.03%. Three types of cattle bone (Aceh, Bali dan Brahman) are separated into different quadrants. Inspite of both Aceh cattle data are closed each to others and are located in the same quadrant. This experiment proved that the cattle bones of Aceh, Bali dan Brahman can be well distinguished by using the combination method of FTIR and PCA.

Aceh International Journal of Science and Technology, 2018

Development of forward osmosis (FO) membranes became one of the alternative methods for drinking ... more Development of forward osmosis (FO) membranes became one of the alternative methods for drinking water supply in an emergency. In this research, drinking water bags based on FO membrane have been developed using chitosan as the basic material of membrane. The chitosan membrane used for the manufacture of drinking water bags has a thickness of 0.043 mm, 30.3% porosity, tensile strength 28.83 kgf / mm2, swelling degree 43.5% and elongation of 7.16%. Drinking water bags are made with a combination of Polypropylene Plastic (PP) and aluminum foil with FO membrane inside. This drinking water bag can be applied for brackish water purification to be energy drinking water as one of the solutions for the drinking water supply in emergencies. FO process testing is done by using variation of sugar solution as the draw solution, that are glucose, fructose, sucrose and mixture. The concentration of applied draw solution is 1, 2 and 3M within 1 hour treatment. The highest water flux was obtained ...

Jurnal Natural/Jurnal natural, Feb 22, 2024

Journal of Physics: Conference Series, Aug 31, 2023

Journal of physics, Aug 31, 2023

Malacca Pharmaceutics, Mar 16, 2024

Heca Journal of Applied Sciences

This research aims to synthesize silver nanoparticles (AgNPs) using an aqueous leaf extract of Ca... more This research aims to synthesize silver nanoparticles (AgNPs) using an aqueous leaf extract of Calotropis gigantea obtained from the geothermal manifestation Ie Seu-Um, Aceh Besar, Aceh Province, Indonesia. The C. gigantea leaf extract was mixed with AgNO3 solutions at concentrations of 2, 5, and 9 mM, respectively. The mixture was stirred at 80 rpm by a magnetic stirrer for 48 hours in the dark. The change in solution color indicated the reduction of Ag+ to Ag0. The resulting AgNPs synthesized using C. gigantea leaf extract (AgNPs-LCg) exhibited cloudy grey, reddish dark brown, and light brown colors when synthesized with AgNO3 concentrations of 2, 5, and 9 mM, respectively. The particle sizes of AgNPs-LCg had maximum frequencies at 246.98 nm (synthesized using AgNO3 2 mM), 93.02 nm (synthesized using AgNO3 5 mM), and 171.25 nm (synthesized using AgNO3 9 mM). The zeta potential values of AgNPs-LCg using 2, 5, and 9 mM AgNO3 were -41.9, -40.1, and -31.4 mV, respectively. Based on th...

IOP conference series, Feb 1, 2021

The effect of Fe (II) and Mg (II) as matrix ions in the determination of Pb (II) based on 1,10-ph... more The effect of Fe (II) and Mg (II) as matrix ions in the determination of Pb (II) based on 1,10-phenanthroline complexing agent at pH 7 had been investigated. The objective of this study is to determine the effect of Fe (II) and Mg (II) on the determination of Pb (II) using the complexing agent 1,10-phenanthroline. The absorbance determination using a spectrophotometer was conducted at a wavelength of 302.5 nm for Pb (II)-1,10-Phenanthroline. Linear correlation between the investigated absorbance on Pb concentration was represented by a linear equation of y = 0.0131 x + 0.8693 (R2= 0.9613). From the linear equation, it was obtained the increase in sensitivity and linearity for Mg (II), as well as the decrease in sensitivity and linearity for Fe (II). It revealed that Fe (II) and Mg (II) affects the analysis of Pb (II) using 1,10-phenanthroline complexing agent. In order to achieve stability of Pb (II)-1,10-Phenanthroline, it was compared with Mg (II)-1,10-Phenanthroline and Fe (II)-1,10-Phenanthroline. It suggested that Pb (II), Mg (II) and Fe (II) had an equivalent binding strength against 1,10-Phenanthroline.

IOP conference series, Dec 11, 2019

IOP conference series, Feb 1, 2021

Neat chitosan membranes have shortcomings in their application owing to weak mechanical propertie... more Neat chitosan membranes have shortcomings in their application owing to weak mechanical properties, thus, requiring modification. In this study, a chitosan membrane was modified utilizing starch and cross-linking agent (citric acid) addition. The characterization of chitosan-starch membranes using Universal Testing Machine, Scanning Electron Microscope (SEM), Fourier Transform Infra-Red (FTIR), Differential Scanning Calorimetry (DSC), and Thermogravimetric Analysis (TGA) had proven the cross-linking formation. The cross-linked membrane had better tensile strength (11.07 kgf/mm2) than the uncross-linked membrane (66.07kgf/mm2). The DSC thermogram of uncross-linked and cross-linked membranes showed endothermic and exothermic peaks at different temperatures. In addition to the membranes’ thermal characteristics, the DTA thermogram showed the decomposition process on the uncross-linked membrane uncross-linking occurred at a temperature range of 277.74-363.27 °C, while the decomposition of the cross-linked membrane was observed at a range of 287.83-356.38 °C. The FT-IR spectra confirmed a decrease in the intensity of the absorption peak associated with cross-linking formation within the membrane.

Jurnal Natural, Mar 1, 2016

Membranes

This research has successfully fabricated ion selective electrode (ISE) for Pb2+ using castor oil... more This research has successfully fabricated ion selective electrode (ISE) for Pb2+ using castor oil (Ricinus communis L.)-based polyurethane (PU) membrane with 1,10-phenanthroline as the active agent. The sensitivity of the Pb2+ ISE obtained is 27.25 mV/decade with a linear range of [Pb(NO3)2] of 10−10–10−5 M and a coefficient of determination (R2) of 0.959. The system response reaches stability after 25 s of measurement. The Pb2+ has a detection limit of 10−10 M and gives a stable response at pH 7–8 with a 15-day lifetime. The investigation of the selectivity of the ISE was performed using the mixed solution method with log Kij values of <1. The selectivity order of Pb2+ ISE against the foreign ions is Ag2+ > Ca2+ > K+ > Mg2+ > Cu2+ > Fe3+ > Cr3+> Zn2+ > Cd2+. The Pb2+ ISE shows acceptable reproducibility and repeatability with standard deviation values of 0.065 and 0.0079, respectively. Fourier transform infrared (FT-IR) spectra confirmed that 1,10-phenant...

Analytical Letters, 2021

Abstract The Moringa oleifera tree, including the leaves, flowers, pods, and seeds, is highly nut... more Abstract The Moringa oleifera tree, including the leaves, flowers, pods, and seeds, is highly nutritious and useful for the prevention and control of various diseases. Here we have probed the micronutrients in Moringa oleifera leaves using laser-induced breakdown spectroscopy (LIBS). The time-resolved and time-integrated LIBS data reveal the presence of Ca, Mg, K, C, Si, Fe, Al, Ti, Sr, Na, H, O, and Li. The plasma temperature and electron number density required for the elemental composition analysis were estimated to be (6375 ± 500) K from the Saha-Boltzmann plot and (1.0 ± 0.2) 1017 cm−3 from the Stark broadened Hα line, respectively. Elemental analysis of the samples was performed using one-line calibration free LIBS (CF-LIBS). The results reveal that C is the major element together with Ca, Mg, K, Fe Na, Al, Ti, Sr, and Li as micronutrients. The concentrations of the micronutrients determined by CF-LIBS were validated by inductively coupled plasma – optical emission spectrometry (ICP-OES). LIBS has been demonstrated to be a practical candidate for the detection of potentially toxic elements (Li, Al, Si, and Sr) as well as for the compositional analysis.

IOP Conference Series: Earth and Environmental Science, 2022

The use of Calotropis gigantea from Ie Seu-Um, Aceh Besar geothermal area for silver nanoparticle... more The use of Calotropis gigantea from Ie Seu-Um, Aceh Besar geothermal area for silver nanoparticles (AgNPs) synthesized has been reported. The process of synthesis AgNPs can be carried out with chemical methods, physical methods, and green synthesis methods, but in this study, the process is focused on the green synthesis method using C. gigantea flowers and leaves extract from Ie Seu-Um geothermal area, Aceh Besar. Phytochemical analysis showed that C. gigantea leaves contain alkaloids, steroids, tannins, phenolics, and saponins, while the flowers of C. gigantea contain alkaloids, terpenoids, steroids, flavonoids, tannins, phenolics, and saponins. The reaction of the AgNPs formation was observed by colour change formed. AgNPs-C. gigantea flower extract dan AgNPs-C. gigantea leaves extract showed the reddish-brown and brownish-yellow solution respectively after 48 h incubation in dark condition at room temperature. The result of the reaction characterized using UV-Vis Spectrophotomet...

IOP Conference Series: Materials Science and Engineering, 2020

Hematite containing activated carbon (AC/α-Fe2O3) nanocomposite has been prepared by hydrothermal... more Hematite containing activated carbon (AC/α-Fe2O3) nanocomposite has been prepared by hydrothermal method and used as photocatalyst for removing tartrazine dye. Hematite was extracted from iron sand while activated carbon was derived from coffee waste which was activated using hydrochloric acid. The structure and morphology of photocatalyst was characterized by means of X-ray diffraction (XRD), nitrogen adsorption-desorption (BET) and Scanning Electron Microscopy-Energy-Dispersive X-Ray Spectroscopy (SEM-EDS). These techniques indicate that the AC/α-Fe2O3 nanocomposite has an average crystallite size of 35.47 nm and specific surface area of 41.52 m2/g. The photocatalytic activity evaluation showed that various factors influencing the removal of tartrazine dye including pH of dye solution, photocatalyst dosage, dye concentration and irradiation time. The results showed that AC/α-Fe2O3 nanocomposite can remove tartrazine up to 91.01% under UV light and 93.69% under solar light which we...

IOP Conference Series: Earth and Environmental Science, 2019

This research aims to identify Aceh, Bali and Brahman cattle bones using Fourier-Transform Infrar... more This research aims to identify Aceh, Bali and Brahman cattle bones using Fourier-Transform Infrared (FTIR) spectroscopy combined with chemometrics through Principal Component Analysis (PCA). Cattle bone samples were obtained from Lambaro and Lampulo raditional market in Aceh Besar. Firstly, each bone sample was analyzed using FTIR and then followed by FTIR spectra analysis using PCA. FTIR spectra showed that inorganic samples produced from these cattle bones consisting of hydroxyl, carbonate and phosphate functional groups. Further inspection using the PCA plot, the cattle bones were separated into three groups with its difference of 90.03%. Three types of cattle bone (Aceh, Bali dan Brahman) are separated into different quadrants. Inspite of both Aceh cattle data are closed each to others and are located in the same quadrant. This experiment proved that the cattle bones of Aceh, Bali dan Brahman can be well distinguished by using the combination method of FTIR and PCA.

Aceh International Journal of Science and Technology, 2018

Development of forward osmosis (FO) membranes became one of the alternative methods for drinking ... more Development of forward osmosis (FO) membranes became one of the alternative methods for drinking water supply in an emergency. In this research, drinking water bags based on FO membrane have been developed using chitosan as the basic material of membrane. The chitosan membrane used for the manufacture of drinking water bags has a thickness of 0.043 mm, 30.3% porosity, tensile strength 28.83 kgf / mm2, swelling degree 43.5% and elongation of 7.16%. Drinking water bags are made with a combination of Polypropylene Plastic (PP) and aluminum foil with FO membrane inside. This drinking water bag can be applied for brackish water purification to be energy drinking water as one of the solutions for the drinking water supply in emergencies. FO process testing is done by using variation of sugar solution as the draw solution, that are glucose, fructose, sucrose and mixture. The concentration of applied draw solution is 1, 2 and 3M within 1 hour treatment. The highest water flux was obtained ...