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Papers by Felycia Edi Soetaredjo

Journal of the Taiwan Institute of Chemical Engineers, 2016

Http Dx Doi Org 10 1080 00986445 2014 896346, Sep 11, 2014

Food Chemistry, 2016

In this study, a modified aqueous leaching method by complex formation of amylose with glycerol w... more In this study, a modified aqueous leaching method by complex formation of amylose with glycerol was employed for reducing the amylose content of starch in broken white rice to less than 2%, so that the resulting starch can be classified to that of glutinous rice flour. By employing ultrasonication in alkaline condition, extraction of amylose could be performed by washing at lower temperature in shorter time compared to the existing aqueous leaching method. The effects of glycerol concentration, alkali concentration, ultrasonication and treatment time on the amylose content of the treated starch were systematically investigated. Under optimum condition, amylose content of broken white rice starch can be reduced from 27.27% to 1.43% with a yield of 80.42%. The changes in the physicochemical properties of the rice flour before and after treatment were studied.

Journal of Molecular Liquids

Applied Clay Science, 2015

ABSTRACT

Applied Clay Science, 2015

SpringerBriefs in Molecular Science, 2015

Journal of the Taiwan Institute of Chemical Engineers, 2014

ABSTRACT In this study, water hyacinth was hydrolyzed to sugars with dilute sulphuric acid (0.25 ... more ABSTRACT In this study, water hyacinth was hydrolyzed to sugars with dilute sulphuric acid (0.25 M) under subcritical water conditions (P = 20 bar, T = 130 degrees C) for 2 h. The sugar solution was then carbonized under subcritical conditions to produce carbon microsphere. The subcritical water carbonization was conducted at 40 bar and various temperatures (160-200 degrees C) and times (6-10 h). The highest yield of carbon microspheres was 0.1019 g/g dry water hyacinth at the temperature of 200 degrees C for 10 h. The carbon microsphere was activated using a combination of chemical (KOH solution) and physical (microwave) treatments to increase the specific surface area and porosity of carbon microsphere. Electrocapacitive study of carbon microspheres showed that the carbon microsphere activated at impregnation ratio of 1:1 and microwave power of 630 W has the highest specific capacitance and excellent electrochemical stability.

In this experiment, Neem oil extraction from Neem seeds (Azadirachta indica A. Juss) with n-hexan... more In this experiment, Neem oil extraction from Neem seeds (Azadirachta indica A. Juss) with n-hexane and ethanol are presented. Effects of particle size, temperature and type of solvent on the extraction kinetic and thermodynamic parameters were studied. Results showed that the maximum oil yields were 41.11% for ethanol and 44.29% for n-hexane at 50 o C, and 0.425-0.71 mm particle

International Journal of Industrial Chemistry, 2014

Elemental analysis of water hyacinth liquid tar indicated that it contains significant amount of ... more Elemental analysis of water hyacinth liquid tar indicated that it contains significant amount of oxygen atom. GC-MS analysis shows that the water hyacinth liquid tar is a suitable precursor for the preparation of intermediate material for carbon fiber due to high content of phenolic compounds. The carbonization of water hyacinth resin was carried out at 900°C and the yield of the maximum total yield of carbon fiber was 29 %. The carbon fiber was characterized using SEM, and XRD methods, while the FTIR analysis was conducted to qualitatively verify the surface functional groups of water hyacinth tar and resin. The XRD analysis revealed that the carbon fiber is non-graphitic in nature. The pyrolysis temperature did not have any effect on the properties of the carbon fibers. The axial modulus and the tensile strength of carbon fibers produced from water hyacinth tar are around 42 GPa and 600 MPa, respectively. These properties are comparable to the commercial carbon fiber.

Polyhedron, 2015

ABSTRACT The chelation abilities of 2-aminophenol and 3,4-dihydroxybenzoic acid with divalent met... more ABSTRACT The chelation abilities of 2-aminophenol and 3,4-dihydroxybenzoic acid with divalent metal ions (Cu2+, Be2+, Zn2+, Ni2+, Co2+ and Mn2+) in binary and ternary systems at 37 ± 0.1 °C and an ionic strength of 0.15 mol dm−3 NaCl were systematically investigated by using the potentiometric titration method. The chelating abilities of these complexes were obtained by processing the titration data using the Hyperquad2008 program and the results are presented as stability constants. In a binary system, it was shown that metal complexation involving 3,4-dihydroxybenzoic acid (ligand D) is more stable than the one with 2-aminophenol (ligand A). The stability of the formed metal complexes, both in binary and ternary systems, decreases in the following order: Cu2+ > Be2+ > Zn2+ > Ni2+ > Co2+ > Mn2+. The tendency of these metals and ligands to form binary or ternary complexes was also evaluated and discussed by calculating their Δlog KM and log X values. In addition, the distribution of complex species in these systems was graphically presented using the HySS2009 program. UV–Vis spectrophotometry was also performed to qualitatively verify the protonation of these ligands and to confirm the model of the complex formed.

Chemical, Biological and Environmental Engineering - Proceedings of the International Conference on CBEE 2009, 2010

Proceedings of the 14th Asia Pacific Confederation of Chemical Engineering Congress, 2012

Biomass and Bioenergy, 2014

Wastewater sludge

Journal of the Taiwan Institute of Chemical Engineers, 2016

Http Dx Doi Org 10 1080 00986445 2014 896346, Sep 11, 2014

Food Chemistry, 2016

In this study, a modified aqueous leaching method by complex formation of amylose with glycerol w... more In this study, a modified aqueous leaching method by complex formation of amylose with glycerol was employed for reducing the amylose content of starch in broken white rice to less than 2%, so that the resulting starch can be classified to that of glutinous rice flour. By employing ultrasonication in alkaline condition, extraction of amylose could be performed by washing at lower temperature in shorter time compared to the existing aqueous leaching method. The effects of glycerol concentration, alkali concentration, ultrasonication and treatment time on the amylose content of the treated starch were systematically investigated. Under optimum condition, amylose content of broken white rice starch can be reduced from 27.27% to 1.43% with a yield of 80.42%. The changes in the physicochemical properties of the rice flour before and after treatment were studied.

Journal of Molecular Liquids

Applied Clay Science, 2015

ABSTRACT

Applied Clay Science, 2015

SpringerBriefs in Molecular Science, 2015

Journal of the Taiwan Institute of Chemical Engineers, 2014

ABSTRACT In this study, water hyacinth was hydrolyzed to sugars with dilute sulphuric acid (0.25 ... more ABSTRACT In this study, water hyacinth was hydrolyzed to sugars with dilute sulphuric acid (0.25 M) under subcritical water conditions (P = 20 bar, T = 130 degrees C) for 2 h. The sugar solution was then carbonized under subcritical conditions to produce carbon microsphere. The subcritical water carbonization was conducted at 40 bar and various temperatures (160-200 degrees C) and times (6-10 h). The highest yield of carbon microspheres was 0.1019 g/g dry water hyacinth at the temperature of 200 degrees C for 10 h. The carbon microsphere was activated using a combination of chemical (KOH solution) and physical (microwave) treatments to increase the specific surface area and porosity of carbon microsphere. Electrocapacitive study of carbon microspheres showed that the carbon microsphere activated at impregnation ratio of 1:1 and microwave power of 630 W has the highest specific capacitance and excellent electrochemical stability.

In this experiment, Neem oil extraction from Neem seeds (Azadirachta indica A. Juss) with n-hexan... more In this experiment, Neem oil extraction from Neem seeds (Azadirachta indica A. Juss) with n-hexane and ethanol are presented. Effects of particle size, temperature and type of solvent on the extraction kinetic and thermodynamic parameters were studied. Results showed that the maximum oil yields were 41.11% for ethanol and 44.29% for n-hexane at 50 o C, and 0.425-0.71 mm particle

International Journal of Industrial Chemistry, 2014

Elemental analysis of water hyacinth liquid tar indicated that it contains significant amount of ... more Elemental analysis of water hyacinth liquid tar indicated that it contains significant amount of oxygen atom. GC-MS analysis shows that the water hyacinth liquid tar is a suitable precursor for the preparation of intermediate material for carbon fiber due to high content of phenolic compounds. The carbonization of water hyacinth resin was carried out at 900°C and the yield of the maximum total yield of carbon fiber was 29 %. The carbon fiber was characterized using SEM, and XRD methods, while the FTIR analysis was conducted to qualitatively verify the surface functional groups of water hyacinth tar and resin. The XRD analysis revealed that the carbon fiber is non-graphitic in nature. The pyrolysis temperature did not have any effect on the properties of the carbon fibers. The axial modulus and the tensile strength of carbon fibers produced from water hyacinth tar are around 42 GPa and 600 MPa, respectively. These properties are comparable to the commercial carbon fiber.

Polyhedron, 2015

ABSTRACT The chelation abilities of 2-aminophenol and 3,4-dihydroxybenzoic acid with divalent met... more ABSTRACT The chelation abilities of 2-aminophenol and 3,4-dihydroxybenzoic acid with divalent metal ions (Cu2+, Be2+, Zn2+, Ni2+, Co2+ and Mn2+) in binary and ternary systems at 37 ± 0.1 °C and an ionic strength of 0.15 mol dm−3 NaCl were systematically investigated by using the potentiometric titration method. The chelating abilities of these complexes were obtained by processing the titration data using the Hyperquad2008 program and the results are presented as stability constants. In a binary system, it was shown that metal complexation involving 3,4-dihydroxybenzoic acid (ligand D) is more stable than the one with 2-aminophenol (ligand A). The stability of the formed metal complexes, both in binary and ternary systems, decreases in the following order: Cu2+ > Be2+ > Zn2+ > Ni2+ > Co2+ > Mn2+. The tendency of these metals and ligands to form binary or ternary complexes was also evaluated and discussed by calculating their Δlog KM and log X values. In addition, the distribution of complex species in these systems was graphically presented using the HySS2009 program. UV–Vis spectrophotometry was also performed to qualitatively verify the protonation of these ligands and to confirm the model of the complex formed.

Chemical, Biological and Environmental Engineering - Proceedings of the International Conference on CBEE 2009, 2010

Proceedings of the 14th Asia Pacific Confederation of Chemical Engineering Congress, 2012

Biomass and Bioenergy, 2014

Wastewater sludge