Zhu Zhangbing, Liu Zhidan, Zhang Yuanhui, Li Baoming, Lu Haifeng, Duan Na, Si Buchun, Shen Ruixia, Lu Jianwen
Laboratory of Environment-Enhancing Energy (E2E) and Key Laboratory of Agricultural Engineering in Structure and Environment, Ministry of Agriculture, College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China.
Laboratory of Environment-Enhancing Energy (E2E) and Key Laboratory of Agricultural Engineering in Structure and Environment, Ministry of Agriculture, College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China.
Bioresour Technol. 2016 Jan;199:220-227. doi: 10.1016/j.biortech.2015.08.043. Epub 2015 Aug 20.
This study focused on the degradation of cornstalk and recovery of reducing sugars and volatile fatty acids (VFAs) at different hydrothermal treatment severity (HTS) (4.17-8.28, 190-320°C). The highest recovery of reducing sugars and VFAs reached 92.39% of aqueous products, equal to 34.79% based on dry biomass (HTS, 6.31). GC-MS and HPLC identified that the aqueous contained furfural (0.35-2.88 g/L) and 5-hydroxymethyl furfural (0-0.85 g/L) besides reducing sugars and VFAs. Hemicellulose and cellulose were completely degraded at a HTS of 5.70 and 7.60, respectively. SEM analysis showed that cornstalk was gradually changed from rigid and highly ordered fibrils to molten and grainy structure as HTS increased. FT-IR and TGA revealed the significant changes of organic groups for cornstalk before and after hydrothermal treatment at different HTS. Hydrothermal treatment might be promising for providing feedstocks suitable for biohythane production.
本研究聚焦于在不同水热处理强度（HTS）（4.17 - 8.28，190 - 320°C）下玉米秸秆的降解以及还原糖和挥发性脂肪酸（VFAs）的回收。还原糖和VFAs的最高回收率达到水相产物的92.39%，基于干生物质计为34.79%（HTS为6.31）。气相色谱 - 质谱联用仪（GC - MS）和高效液相色谱（HPLC）鉴定出，除了还原糖和VFAs外，水相中还含有糠醛（0.35 - 2.88 g/L）和5 - 羟甲基糠醛（0 - 0.85 g/L）。半纤维素和纤维素分别在HTS为5.70和7.60时完全降解。扫描电子显微镜（SEM）分析表明，随着HTS的增加，玉米秸秆逐渐从坚硬且高度有序的纤维状变为熔融且颗粒状结构。傅里叶变换红外光谱（FT - IR）和热重分析（TGA）揭示了在不同HTS下水热处理前后玉米秸秆有机基团的显著变化。水热处理可能有望提供适合生物合成气生产的原料。
