School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, China.
Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan.
Environ Sci Pollut Res Int. 2021 Aug;28(30):40715-40723. doi: 10.1007/s11356-021-12758-4. Epub 2021 May 4.
Rice husk is a bulky byproduct with a high silica content from rice milling. In this study, the application of an acid-catalyzed ionic liquid (IL) pretreatment was studied for processing rice husks with a rugged structure. The pretreatment conditions were 130°C for 30 min with 1.2 wt% HCl. The results of enzymatic hydrolysis demonstrated that cellulose conversion of HCl-BMIMCl-treated at 48 h was increased by 660.05%, 538.81%, and 376.55% compared with the untreated, HCl-treated, and BMIMCl-treated rice husks, respectively. Composition analysis demonstrated that most of the hemicellulose was removed in the acid-IL combined treatment. Moreover, scanning electron microscopy, X-ray diffraction (XRD), and Fourier transform infrared analyses indicated that the crystalline structure and outer silica layer of the rice husks were efficiently broken up. The results revealed that the HCl-catalyzed dissolution is highly favorable for the industrial application of rick husks in the production of fermentable sugar and high-purity silica.
稻壳是一种体积庞大的副产物，含有大量的二氧化硅，是大米加工过程中的产物。在这项研究中，研究了一种酸催化离子液体（IL）预处理方法，以处理结构粗糙的稻壳。预处理条件为 130°C 30min，盐酸用量为 1.2wt%。酶水解结果表明，与未处理、HCl 处理和 BMIMCl 处理的稻壳相比，HCl-BMIMCl 处理 48h 后的纤维素转化率分别提高了 660.05%、538.81%和 376.55%。组成分析表明，在酸-IL 联合处理中，大部分半纤维素被去除。此外，扫描电子显微镜、X 射线衍射（XRD）和傅里叶变换红外分析表明，稻壳的结晶结构和外硅层被有效地破坏。结果表明，HCl 催化的溶解对稻壳在生产可发酵糖和高纯度二氧化硅方面的工业应用非常有利。
