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Adsorption of Pb2+ and Cd2+ on silica-modified and nitrogen self-doped lotus leaf biochar: Adsorption behavior and mechanism

文献类型： 外文期刊

作者： Li, Yuanping 1 ; Hou, Suzhen 2 ; Chen, Yaoning 2 ; Liu, Yihuan 4 ; Zhao, Mengyang 2 ; Jiang, Hongjuan 2 ; Chi, Nianping 1 ; He, Guowen 5 ; Jia, Shunyao 1 ;

作者机构： 1.Hunan City Univ, Sch Municipal & Geomat Engn, Yiyang 413000, Hunan, Peoples R China

2.Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Peoples R China

3.Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Peoples R China

4.Zhejiang Acad Agr Sci, Inst Environm Resource Soil & Fertilizer, State Key Lab Managing Biot & Chem Threats Qual &, Hangzhou 310021, Peoples R China

5.Hunan City Univ, Sch Mat & Chem Engn, Yiyang 413000, Hunan, Peoples R China

关键词： Lotus leaf; Micro-silicon powder; Nitrogen-containing; Biochar; Heavy metals

期刊名称：BIOCHEMICAL ENGINEERING JOURNAL （ 影响因子：3.8； 五年影响因子：3.7 ）

ISSN： 1369-703X

年卷期： 2025 年 223 卷

页码：

收录情况： SCI

摘要： Biochar and its modified products have received much attention in the adsorption treatment of heavy metal wastes, but there has been great potential for improvement in efficiency and cost. In this study, nitrogencontaining lotus leaves taken from lotus root harvests were pyrolyzed and modified by the silicon from industrial by-product micro-silicon powder, and then the Si-modified and nitrogen self-doped lotus leaf biochar (Si@N-BC) was prepared as an efficient material for the adsorption of Pb2+ and Cd2+ in aqueous solution. The results demonstrated that the adsorption performance of Si@N-BC was significantly enhanced than the pristine biochar, and the maximum adsorption capacities of Pb2+ and Cd2+ were estimated based on the Langmuir model to be 363.60 mg/g and 56.04 mg/g, respectively. The adsorption kinetic experiment indicated that the adsorption reaction was dominated by chemisorption. Moreover, the high performance of Si@N-BC is not only related to ion exchange and surface precipitation, but also the complexation reactions between oxygencontaining functional groups, nitrogen-containing functional groups, and silicon-containing functional groups. In conclusion, Si@N-BC is a novel and promising adsorbent that is conducive to the resourceful utilization of lotus leaf and micro-silicon powder, and its multiple functional groups can work together to achieve efficient removal of heavy metals from water.

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