Papers by Chularat Sakdaronnarong
Fuel
Carbon-based catalysts were active for hydrolysis of lignocellulose and starch. Direct sulfonated... more Carbon-based catalysts were active for hydrolysis of lignocellulose and starch. Direct sulfonated catalyst had similar efficiency as pyrolyzed/sulfonated ones. Higher glucose yield was achieved from more severe condition compared with xylose. a b s t r a c t Carbonaceous catalysts derived from sugarcane bagasse (SCB), cellulose and lignin were synthesized by three different methods using slow pyrolysis and subsequent sulfonation. The synthesized catalysts were used for hydrolysis of lignocellulose and cassava starch. The catalysts synthesized from SCB 100 mesh (type I) and lignin (type II) were highly active for hydrolysis of SCB (70 mesh), cellulose and starch at 140°C for 3 h yielding 18.0%, 27.6%, 87.6% and 65.0%, 46.0%, 96.5% total reducing sugar (TRS) yields, respectively. Box-Behnken design was applied to investigate the influence of reaction temperature, amount of catalyst and reaction time on hydrolysis yield of delignified SCB in the presence of these two catalysts. The finding demonstrated that the lignin catalyst (type II) prepared by direct sulfonation without pyrolysis had equal or higher catalytic performance than catalysts prepared by pyrolysis and sulfonation.
Carbon-based, polymer-based and metal-based catalysts were synthesized. Influence of differen... more Carbon-based, polymer-based and metal-based catalysts were synthesized. Influence of different solvents in sugarcane bagasse hydrolysis was investigated. Active catalyst and suitable co-solvent system improved the hydrolysis efficiency. Sugar yield of bagasse via hydrolysis reaction in a small reactor was boosted up.
Renewable Energy, 2015
This study investigated the feasibility of using lignin waste from pulp and paper industry as a m... more This study investigated the feasibility of using lignin waste from pulp and paper industry as a mediator for treating ethanol stillage wastewater in microbial fuel cells (MFCs). Two configurations of MFCs used a salt-bridge and proton exchange membrane (PEM), and the influence of lignin and KMnO 4 as mediators in PEM MFCs was evaluated. For salt-bridge MFC, graphite plates were used as cathode and anode while carbon cloth and graphite rods were substituted for cathode and anode in PEM MFC. The external resistance for both configurations was 550 ± 50U. Results showed that PEM MFC generated higher electric power with satisfactory treatment of wastewater. When lignin was added as a mediator in PEM MFC, the maximum power density increased to 93 W/m 2 with COD removal efficiency of about 81% after 6-day operation. This study showed the potential for the treatment of lignin-rich wastewater and ethanol stillage wastewater simultaneously with possibility of electric power generation.
AMR, 2014
Delignified sugarcane bagasse (SCB) by solvent extraction was carried out at moderate condition (... more Delignified sugarcane bagasse (SCB) by solvent extraction was carried out at moderate condition (90°C, 4 h) in the presence of acid catalyst. To investigate the dissolution of lignin into solvent, different solvents were utilized during lignin extraction process. Delignified SCB was further hydrolyzed by cell wall degrading enzyme complexes prior to sugar determination. The results showed that n-butanol was the most promising solvent enhancing lignin dissolution which in turn led to highest yield of glucose (63.1% based on treated SCB) and no xylose was detected in hydrolysate. The lignin extraction by n-butanol in the presence of H 2 SO 4 and subsequent saccharification process were then scaled up for lactic acid production. The maximum lactic acid was obtained at 25.7 ± 0.2 g/l from L. casei fermentation after 96 hours when sugarcane bagasse hydrolysate containing 25.6±1.4 g/l initial glucose concentration was used as substrate.
Rice straw and sugarcane bagasse degradation mimicking lignocellulose decay in nature: An alternative approach to biorefinery
ScienceAsia, 2012
LWT - Food Science and Technology, 2014
Lignin extracts from sugarcane bagasse by alkaline extraction in the presence and absence of etha... more Lignin extracts from sugarcane bagasse by alkaline extraction in the presence and absence of ethanol were investigated for their efficacy on maintaining fresh fruit shelf life. For lignin extraction, the highest lignin yield was obtained from 40% (w/w) NaOH extraction in water. Addition of ethanol gave relatively lower yield of lignin but less hemicellulose contamination. FT-IR intensity of lignin-to-carbohydrate transmittance ratios of extracted lignin from 40% (w/w) NaOH in distilled water were similar to the ratios of lignin standard from Kraft process. From gel permeation chromatography (GPC), lignin isolated from 40% (w/w) NaOH in distilled water yielded high amount of both large and small molecules of lignin. The weight loss ratio between lignin and hemicellulose was analyzed by thermogravimetric analysis (TGA). It was confirmed that isolated lignin from 40% (w/w) NaOH in distilled water contained highest amount of hemicellulose in lignin extract. The test of coating formulas on limes demonstrated that coating solutions of 0.8% (w/w) xanthan gum and 1.5% (w/w) extracted lignin from 40% (w/w) NaOH had potential to maintain weight loss and color change. This coating formula also exhibited higher antifungal activities. Limes coated with extracted lignin showed higher antifungal activity than limes coated with commercial lignin.
Fuel, 2014
Carbon-based catalysts were active for hydrolysis of lignocellulose and starch. Direct sulfonated... more Carbon-based catalysts were active for hydrolysis of lignocellulose and starch. Direct sulfonated catalyst had similar efficiency as pyrolyzed/sulfonated ones. Higher glucose yield was achieved from more severe condition compared with xylose. a b s t r a c t Carbonaceous catalysts derived from sugarcane bagasse (SCB), cellulose and lignin were synthesized by three different methods using slow pyrolysis and subsequent sulfonation. The synthesized catalysts were used for hydrolysis of lignocellulose and cassava starch. The catalysts synthesized from SCB 100 mesh (type I) and lignin (type II) were highly active for hydrolysis of SCB (70 mesh), cellulose and starch at 140°C for 3 h yielding 18.0%, 27.6%, 87.6% and 65.0%, 46.0%, 96.5% total reducing sugar (TRS) yields, respectively. Box-Behnken design was applied to investigate the influence of reaction temperature, amount of catalyst and reaction time on hydrolysis yield of delignified SCB in the presence of these two catalysts. The finding demonstrated that the lignin catalyst (type II) prepared by direct sulfonation without pyrolysis had equal or higher catalytic performance than catalysts prepared by pyrolysis and sulfonation.
Thermo-molded biocomposite from cassava starch, natural fibers and lignin associated by laccase-mediator system
Carbohydrate Polymers, 2013
Treatment of cellulose fibers and lignin by laccase-mediator system was conducted to enhance the ... more Treatment of cellulose fibers and lignin by laccase-mediator system was conducted to enhance the binding efficiency of natural fibers and lignin compounds into cassava starch composite matrix. Violuric acid (VA) was tested for its effect as a mediator for laccase treatment. Influence of different fiber, lignin and water contents of biocomposite was statistically investigated. The results showed that adding 15% (w/w) fibers into biocomposite at 44% (w/w) water content increased flexural strength and modulus for 4 times compared with the control. A combination of fibers+VA gave the greatest enhancement of modulus for 1140% and flexural strength for 375.8% as much as neat starch biocomposite. The presence of fibers, lignin and VA as mediator for laccase treatment substantially enhanced water resistance of starch biocomposite detected by a change in water drop contact angle on biocomposite surface.
Biochemical Engineering Journal, 2014
Sugarcane bagasse and rice straw were subjected to acid and alkaline ethanolysis and sequential e... more Sugarcane bagasse and rice straw were subjected to acid and alkaline ethanolysis and sequential enzymatic hydrolysis to produce glucose for lactic acid production. Influence of physico-chemical treatments using ultrasonic bath and ultrasonic probe was studied compared with mechanical stirring. The results showed that the highest glucose yield with least contamination of xylose was obtained from acid ethanolysis fractionation (5 N H 2 SO 4 + 50%, v/v ethanol) when stirred at 90 • C for 4 h. Alkaline ethanolysis accomplished high amount of both glucose and xylose released, however it was not favorable substrate for homofermentative lactic acid bacteria. In order to enhance enzymatic hydrolysis of acid ethanolysis fractionated samples, lignin was subsequently removed by the second step alkaline/peroxide delignification. The maximum lactic acid was obtained at 23.6 ± 0.2 g/L from Lactobacillus casei fermentation after 72 h when hydrolysate from two-step acid hydrolysis and alkaline/peroxide fractionated sugarcane bagasse containing 24.6 g/L initial glucose concentration was used as substrate.
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Papers by Chularat Sakdaronnarong