Pretreating wheat straw by the concentrated phosphoric acid plus hydrogen peroxide (PHP): Investigations on pretreatment conditions and structure changes.
Pretreating wheat straw by the concentrated phosphoric acid plus hydrogen peroxide (PHP): Investigations on pretreatment conditions and structure changes.
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DOI：
10.1016/j.biortech.2015.07.112
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发表时间：
2016
影响因子：
11.4
通讯作者：
Qing Wang;Jinguang Hu;Fei Shen;Z. Mei;Gang Yang;Yanzong Zhang;YaoDong Hu;Jing Zhang;Shi-huai Deng
中科院分区：
文献类型：
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作者：
Qing Wang;Jinguang Hu;Fei Shen;Z. Mei;Gang Yang;Yanzong Zhang;YaoDong Hu;Jing Zhang;Shi-huai Deng
用PHP法(浓磷酸+过氧化氢)对麦草进行处理，研究了温度、时间和磷酸比例对半纤维素脱除、脱木素、纤维素回收率和酶消化率的影响。总体而言，与浓缩H3PO4相比，PHP对半纤维素的去除作用更强。此外，高效脱木素尤其发生在PHP的前处理过程中。PHP对半纤维素的脱除和脱木素对温度和时间有较好的响应。增加PHP中H3PO4的比例可以促进半纤维素的脱除，但会降低脱木素。最大脱木素效率分别为83.7%和100%。随着温度的升高、时间的延长和磷酸比例的增加，经PHP处理的麦草的酶消化率大大提高，从而达到完全水解的目的。在温度为30~40℃、时间为2.0h、磷酸比例为60%的条件下，处理后麦草中的纤维素保留率可达92%以上，100g麦草可得29.1~32.6g葡萄糖。
Wheat straw was pretreated by PHP (the concentrated H3PO4plus H2O2) to clarify effects of temperature, time and H3PO4proportion on hemicellulose removal, delignification, cellulose recovery and enzymatic digestibility. Overall, hemicellulose removal was intensified by PHP comparing to the concentrated H3PO4. Moreover, efficient delignification specially happened in PHP pretreatment. Hemicellulose removal and delignification by PHP positively responded to temperature and time. Increasing H3PO4proportion in PHP can promote hemicellulose removal, however, decrease the delignification. Maximum hemicellulose removal and delignification were achieved at 100% and 83.7% by PHP. Enzymatic digestibility of PHP-pretreated wheat straw was greatly improved by increasing temperature, time and H3PO4proportion, and complete hydrolysis can be achieved consequently. As temperature of 30–40 °C, time of 2.0 h and H3PO4proportion of 60% were employed, more than 92% cellulose was retained in the pretreated wheat straw, and 29.1–32.6 g glucose can be harvested from 100 g wheat straw.