Silica Removal from Rice Straw To Improve its Hydrolysis and Ethanol Production
Silica Removal from Rice Straw To Improve its Hydrolysis and Ethanol Production
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DOI：
10.1021/acs.iecr.7b02830
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发表时间：
2017-09-06
影响因子：
4.2
通讯作者：
Karimi, Keikhosro
中科院分区：
文献类型：
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作者：
Khaleghian, Hoori;Molaverdi, Maryam;Karimi, Keikhosro
与其他木质纤维素相比，稻草具有较高的二氧化硅含量。稻草外层二氧化硅的存在降低了酶水解和乙醇生产产率。研究了不同碱处理对稻草中二氧化硅的去除效果。结果表明，碳酸钠能有效去除秸秆中的二氧化硅（>91%）。为了仅研究二氧化硅去除的影响并消除木质素去除对酶水解的影响，进行了有机溶剂接着碳酸钠预处理。有机溶剂预处理去除了大部分秸秆木质素，而二氧化硅没有分离。有机溶剂预处理使稻草的葡萄糖和乙醇产率分别从未处理的34.4%和39.3%提高到52.9%和51.6%，而进一步用碳酸钠处理使产率提高到94.8%和78.7%。结果表明，硅质层对水稻秸秆的保护作用大于木质素。
Rice straw has high silica content compared with other lignocelluloses. Presence of silica in the outer layer of rice straw reduces enzymatic hydrolysis and ethanol production yield. In this study, silica removal from rice straw was investigated through various alkali treatments. The results showed that sodium carbonate could effectively remove silica from the straw (>91%). To investigate only the effects of silica removal and eliminate the effect of lignin removal on enzymatic hydrolysis, organosolv followed by sodium carbonate pretreatment was conducted. Organosolv pretreatment removed most of the straw lignin, while silica was not separated. Organosolv pretreatment of rice straw improved the glucose and ethanol yield from 34.4% and 39.3% for the untreated straw to only 52.9% and 51.6%, respectively, whereas further treatment with sodium carbonate increased the yields up to 94.8% and 78.7%. The results indicated that the protecting effect of silica layer was greater than that of lignin in rice straw.