Yuan Xiaoxian, Li Shifeng, Yang Fei, Wang Siyuan, Bie Shiji, Wang Zhipu, Zhang Hongzhen, Liu Jian, Zhou Jiabin, Wang Xinwei, Liu Dan, Feng Chen
State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing at Karamay, Karamay 834000, China.
Karamay Shuangxin Environmental Technology Co., Ltd, Karamay 834000, China.
Ecotoxicol Environ Saf. 2025 Mar 1;292:117927. doi: 10.1016/j.ecoenv.2025.117927. Epub 2025 Mar 5.
Arsenic (As) is a carcinogen that threatens ecosystems and human health. Due to its high adsorption, and microporosity, biochar is widely available for soil remediation. This review significantly summarizes the current status of waste biomass feedstock-based biochar and metal-modified biochar for As-contaminated soil remediation. Firstly, this paper briefly describes the sources and hazards of As in soil, and secondly, lists eleven feedstocks for preparing biochar. Agricultural, domestic, and forestry wastes provide a plentiful source for biochar preparation. Single or multi-metal modifications such as iron (Fe), manganese (Mn), and cerium (Ce) can effectively improve the Arsenite [As(III)] and arsenate [As(V)] adsorption capacity of biochar. The primary mechanisms of As removal by waste biomass feedstock-based biochar and metal-modified biochar include ion exchange, electrostatic attraction, surface complexation, redox transformation, and H-bond formation. In conclusion, this review presents an in-depth discussion on both waste biomass feedstocks and metal modification, providing constructive suggestions for the future development of biochar to remediate As-contaminated soil.
砷（As）是一种致癌物，威胁着生态系统和人类健康。由于其高吸附性和微孔性，生物炭在土壤修复中具有广泛的应用前景。本文综述了基于废弃生物质原料的生物炭和金属改性生物炭在修复砷污染土壤方面的研究现状。首先，本文简要介绍了土壤中砷的来源和危害，其次，列出了十一种制备生物炭的原料。农业、生活和林业废弃物为生物炭的制备提供了丰富的来源。单一或多金属改性，如铁（Fe）、锰（Mn）和铈（Ce），可以有效提高生物炭对亚砷酸盐[As(III)]和砷酸盐[As(V)]的吸附能力。基于废弃生物质原料的生物炭和金属改性生物炭去除砷的主要机制包括离子交换、静电吸引、表面络合、氧化还原转化和氢键形成。总之，本文对废弃生物质原料和金属改性进行了深入讨论，为生物炭修复砷污染土壤的未来发展提供了建设性建议。
