Jia Li, Yu Yue, Li Ze-Peng, Qin Shu-Ning, Guo Jin-Rong, Zhang Yong-Qiang, Wang Jian-Cheng, Zhang Jian-Chun, Fan Bao-Guo, Jin Yan
College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China.
College of Economics and Management, Taiyuan University of Technology, Taiyuan 030024, PR China.
Bioresour Technol. 2021 Jul;332:125086. doi: 10.1016/j.biortech.2021.125086. Epub 2021 Apr 2.
An iron-based composite adsorbent with biochar as the support was prepared by coprecipitation and the sol-gel method. Both single-iron-based modified biochar without doping with other metals and iron-based modified biochar doped with multiple metals (Ce, Cu, Co, Mn) were synthesised. The adsorption kinetics were analysed, and temperature-programmed desorption measurements were performed to reveal the inherent difference in mechanism between the oxidation and adsorption of Hg by the modified biochar and to elucidate the key mechanism of Hg removal. The results show that the removal of Hg by the modified biochar mainly includes adsorption and oxidation processes. The adsorption process is divided into two stages, external and internal mass transfer, both of which occur via multilayer adsorption. HgO and Hg-OM are the main forms of Hg present on the modified biochar surface. Doped metal oxides can play a synergistic role in enhancing the mercury removal performance of the modified biochar.
采用共沉淀法和溶胶-凝胶法制备了以生物炭为载体的铁基复合吸附剂。合成了未掺杂其他金属的单铁基改性生物炭以及掺杂多种金属（铈、铜、钴、锰）的铁基改性生物炭。分析了吸附动力学，并进行了程序升温脱附测量，以揭示改性生物炭对汞的氧化和吸附在机理上的内在差异，并阐明汞去除的关键机制。结果表明，改性生物炭对汞的去除主要包括吸附和氧化过程。吸附过程分为外部和内部传质两个阶段，两者均通过多层吸附发生。HgO和Hg-OM是改性生物炭表面汞的主要存在形式。掺杂的金属氧化物在提高改性生物炭的汞去除性能方面可发挥协同作用。
