Delignification with Alkaline Peroxide from Lespedeza Stalks Steam-Pretreated at Low Severity
A steam pretreatment method with low severity and post pretreatment with alkaline peroxide were investigated in this study with respect to the factors affecting delignification efficiency of Lespedeza Stalks. In alkaline peroxide procedure, four factors were compared to evaluate the lignin removal: substrate concentration (w/w), the ratio of peroxide to substrate (w/w), temperature and time. The remaining lignin of fractions from Lespedeza stalks steam pretreated at low severity was apparently reduced by post treatment with 1 g H2O2/g substrate at the substrate concentration of 1.67% under 60°C for 72h. Scanning electron microscopy images show that the samples with alkaline peroxide treatment have the smoother surface because of the elimination of lignin droplets and the fiber bundles individualized.
Zhong Cao, Yinghe He, Lixian Sun and Xueqiang Cao
Z. Q. Su et al., "Delignification with Alkaline Peroxide from Lespedeza Stalks Steam-Pretreated at Low Severity", Advanced Materials Research, Vols. 236-238, pp. 448-451, 2011