文献类型：期刊文献

英文题名：Enhanced enzymatic hydrolysis of rice straw pretreated by alkali assisted with photocatalysis technology

作者：Niu, Kun[1];Chen, Peng[1];Zhang, Xu[1];Tan, Wen-Song[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China

年份：2009

卷号：84

期号：8

起止页码：1240

外文期刊名：JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY

收录：;EI(收录号：20093112222571);WOS:【SCI-EXPANDED(收录号:WOS:000268262000021)】；

基金：The authors are grateful for the financial support of this research by the National Special Fund of China for State Key Laboratory of Bioreactor Engineering, Grant No. 2060204.

语种：英文

外文关键词：straw pretreatment; alkali; photocatalysis; nano-TiO2

摘要：BACKGROUND: The fermentable sugars in lignocellulose are derived from cellulose and hemicellulose, which are not readily accessible to enzymatic hydrolysis because of their biological resistance, so that pretreatment of lignocellulose is needed for this process. In this work, a novel lignocellulose pretreatment method using alkali solution assisted by photocatalysis was investigated. RESULTS: The reaction conditions of nano-TiO2 dosage and photocatalysis time were optimized at 2 g L-1 and 1 h, respectively. After pretreatment under these conditions, cellulose in rice straw was increased from 37.5% to 71.5%, and lignin decreased from 18.5% to 9.0%. The results of X-ray diffraction (XRD), Fourier transform infrared (FT-IR) and scanning electron microscopy (SEM) analysis showed that the physical properties and microstructure of the straw were changed by this pretreatment, which favored the following enzymatic hydrolysis. The enzymatic hydrolysis rate of the straw pretreated using this technology was verified to be 73.96%, which was 2.56 times higher than that obtained with the alkali procedure. CONCLUSION: The proposed photocatalysis pretreatment technology was more efficient at degrading the lignin and hemicellulose in rice straw than alkali pretreatment, making it more readily available for the following enzymatic hydrolysis process. (C) 2009 Society of Chemical Industry