Pretreating wheat straw by the concentrated phosphoric acid plus hydrogen peroxide (PHP): Investigations on pretreatment conditions and structure changes.
Wheat straw was pretreated by PHP (the concentrated H3PO4 plus H2O2) to clarify effects of temperature, time and H3PO4 proportion 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 H3PO4 proportion 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 H3PO4 proportion, and complete hydrolysis can be achieved consequently. As temperature of 30-40°C, time of 2.0 h and H3PO4 proportion of 60% were employed, more than 92% cellulose was retained in the pretreated wheat straw, and 29.1-32.6g glucose can be harvested from 100g wheat straw.
['Wang|Qing|Q|', 'Hu|Jinguang|J|', 'Shen|Fei|F|', 'Mei|Zili|Z|', 'Yang|Gang|G|', 'Zhang|Yanzong|Y|', 'Hu|Yaodong|Y|', 'Zhang|Jing|J|', 'Deng|Shihuai|S|']
D002482:Cellulose D005947:Glucose D006861:Hydrogen Peroxide D006868:Hydrolysis D008031:Lignin D010756:Phosphoric Acids D011134:Polysaccharides D013696:Temperature D013997:Time Factors D014908:Triticum D014866:Waste Products
Phosphoric acid plus hydrogen peroxide Hemicellulose removal Delignification Enzymatic hydrolysis Structure characteristics