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Zhu Z.-S.,South China University of Technology | Zhu M.-J.,South China University of Technology | Xu W.-X.,South China University of Technology | Liang L.,Guangzhou Sugarcane Industry Research Institute
Biotechnology and Bioprocess Engineering | Year: 2012

In this study, we investigated the production of bioethanol from sugarcane bagasse (SCB) using an NH4OH-H2O2 pretreatment and simultaneous saccharification and co-fermentation (SScF). Response surface methodology and a 23 Box-Behnken design were used to evaluate the effect of different liquid mixture concentrations, liquid-tosolid ratios (LSRs) and pretreatment temperatures on the production of ethanol. The liquid mixture concentration and LSR significantly influenced the fermentation efficiency. Based on ridge max analysis, the following pretreatment conditions resulted in a fermentation efficiency of 95.79 ± 0.01%: liquid mixture concentration 53%, LSR 28, and atemperature of 63°C. A morphological analysis performed using scanning electron microscopy (SEM) and chemical characterization revealed that these pretreatment conditions were effective in disrupting the sugarcane fibers and removing lignin. Ethanol fermentation with the pretreated SCB using SScF in yeast SHY 07-1 resulted in an ethanol concentration of 14.65 ± 0.17 g/L, an ethanol yield of 0.48 ± 0.01 g/g, and an ethanol productivity of 0.12 ± 0.01 g/(L/ h), which represents increases of 106.02, 89.98, and 107.02%, respectively, over the values obtained from SScF with untreated SCB. © 2012 The Korean Society for Biotechnology and Bioengineering and Springer. Source

Chang C.,Kyoto University | Chang C.,Guangzhou Sugarcane Industry Research Institute | Teramoto Y.,Kyoto University | Nishio Y.,Kyoto University
Journal of Polymer Science, Part A: Polymer Chemistry | Year: 2013

O-(2,3-dihydroxypropyl) cellulose (DHPC) samples were synthesized by etherification of cellulose with glycidol (GLY) in a NaOH/urea aqueous solution system under different reaction conditions, so that they had different degrees of ether substitution (DS) in both the overall and regional distributions. The characterization was made by NMR spectroscopy in order to clarify the effects of the molar ratio of in-fed GLY to anhydroglucose unit and of the reaction temperature not only on the total and regional DSs but also on the molar substitution (MSdhp) for the multireactive dihydroxypropyl group. The evaluation of MSdhp was performed after complete propionylation of each DHPC sample. Determination of molecular weights was also conducted on the propionylated DHPCs by GPC analysis. As a preliminary extension, butyralization of DHPC was undertaken in aqueous solution by using p-toluenesulfonic acid as catalyst together with butyraldehyde (BuA). Two-dimensional NMR ( 1H-13C gHSQC) spectra measurements revealed that the products contained butyral groups, owing to dehydration-cyclization between the BuA-carbonyl and the duplicate hydroxyls in the side chain of DHPC. Such butyral derivatives of cellulose are expected to be a promising functional material parallel or superior to poly(vinyl butyral) available for safety glass interlayers, etc. © 2013 Wiley Periodicals, Inc. Source

Tian Q.-Q.,South China University of Technology | Liang L.,Guangzhou Sugarcane Industry Research Institute | Zhu M.-J.,South China University of Technology
Bioresource Technology | Year: 2015

Clostridium thermocellum ATCC 27405 was used to degrade sugarcane bagasse (SCB) directly for hydrogen production, which was significantly enhanced by supplementing medium with CaCO3. The effect of CaCO3 concentration on the hydrogen production was investigated. The hydrogen production was significantly enhanced with the CaCO3 concentration increased from 10mM to 20mM. However, with the CaCO3 concentration further increased from 20mM to 100mM, the hydrogen production didn't increase further. Under the optimal CaCO3 concentration of 20mM, the hydrogen production reached 97.83±5.19mmol/L from 2% sodium hydroxide-pretreated SCB, a 116.72% increase over the control (45.14±1.03mmol/L), and the yield of hydrogen production reached 4.89mmol H2/g SCBadded. Additionally, CaCO3 promoted the biodegradation of SCB and the growth of C. thermocellum. The stimulatory effects of CaCO3 on biohydrogen production are mainly attributed to the buffering capacity of carbonate. The study provides a novel strategy to enhance biohydrogen production from lignocellulose. © 2015 Elsevier Ltd. Source

Li H.,South China University of Technology | Ren J.,South China University of Technology | Zhong L.,South China University of Technology | Sun R.,South China University of Technology | And 2 more authors.
Bioresource Technology | Year: 2015

The conversion of xylose, water-insoluble hemicelluloses (WIH) and water-soluble fraction (WSF) of corncob to furfural was performed using montmorillonite with tin ions (Sn-MMT) containing double acid sites as a solid acid catalyst. The co-existence of Lewis acids and Brønsted acids in Sn-MMT was shown to improve the furfural yield and selectivity. 76.79% furfural yield and 82.45% furfural selectivity were obtained from xylose using Sn-MMT as a catalyst in a biphasic system with 2-s-butylphenol (SBP) as the organic extracting layer and dimethyl sulfoxide (DMSO) as the co-solvent in contact with an aqueous phase saturated with NaCl (SBP/NaCl-DMSO) at 180. °C for 30. min. Furthermore, Sn-MMT also demonstrated the excellent catalytic performance in the conversion of pentose-rich materials of corncob and 39.56% and 54.15% furfural yields can be directly obtained from WIH and WSF in the SBP/NaCl-DMSO system, respectively. © 2014 Elsevier Ltd. Source

Zeng J.,Wuhan University | Zeng J.,Guangzhou Sugarcane Industry Research Institute | Li R.,Wuhan University | Liu S.,Wuhan University | Zhang L.,Wuhan University
ACS Applied Materials and Interfaces | Year: 2011

Fiber-like TiO2 nanomaterials were designed and created, for the first time, by in situ synthesis of TiO2 nanoparticles in regenerated cellulose fibers in the wet state, followed by calcination at 400-800 °C to remove the cellulose matrix. The cellulose fibers were prepared in an NaOH/urea aqueous system with cooling via an industrialmachine. The structure and properties of the fiber-like TiO2 nanomaterials were characterized with scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and photocatalytic degradation tests. The results revealed that the mean diameter of the fiberlike TiO2 nanomaterials, which consisted of TiO2 nanoparticles with a mean size from 21 to 37 nm, was 7-8 μm. The TiO2 nanomaterials exhibited different crystallinity phases from anatase to rutile, depending on the calcinating temperature. With a decrease in the calcinating temperature from 800 to 400 °C, the surface area of the TiO2 nanomaterials increased. The photocatalytic activity for the degradation of methyl orange of the anatase T-400 fibers calcined at 400 °C was the highest, compared with that at 600 and 800 °C. This work provided a simple and "green" pathway for the preparation of inorganic nanomaterials with different crystal structures by using porous regenerated cellulose matrix. © 2011 American Chemical Society. Source

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