A novel modification of lignin on corncob-based biochar to enhance removal of cadmium from water

作者：Luo, Mingke; Lin, Hai^*; Li, Bing; Dong, Yingbo; He, Yinhai; Wang, Liang

来源：Bioresource Technology, 2018, 259: 312-318.

DOI：10.1016/j.biortech.2018.03.075

• Biochar
• Agricultural waste
• Grafting modification
• Heavy metal
• Lignin

In order to improve the adsorption capacities of corncob-based biochars for heavy metal, the different pyrolysis temperature (350 degrees C, 450 degrees C and 550 degrees C) of corncob-based biochars were modified with the acrylonitrile, and adsorption capacities of Cadmium from solution by biochars were studied. The results showed that only at 350 degrees C the biochar can be successfully modified. The Cd adsorption capacity (85.65 mg/g) by the biosorbent was higher than other methods of modifying biochars previously reported. SEM-EDS and FTIR confirmed that the C N group was grafted on the biochar at low pyrolysis temperature. Batch adsorption experiment including pH-dependence, adsorption kinetics, and isotherms and XPS results showed that the removal mechanism of Cd(II) by the modified biochar was ion exchange and adsorption-complexation. This research not only obtained a novel method to modify biochar but also furthered research into the lignin of biochar composition, and provided an efficient sorbent for heavy metal.

• 出版日期2018-7
• 单位北京科技大学