数字农科院2.0

Removal mechanisms of Cd from water and soil using Fe–Mn oxides modified biochar

文献类型： 外文期刊

作者： Tingting Yang;Yingming Xu;Qingqing Huang;Yuebing Sun;Xuefeng Liang;Lin Wang

作者机构：

关键词： Biomass feedstocks;Cd contamination;Fe-Mn oxides Modification;Precipitation

期刊名称： Environmental Research

ISSN： 0013-9351

年卷期： 2022 年 212 卷

页码：

收录情况： SCIE（2022版）

摘要： The development of remediation materials simultaneously suitable for Cd-contaminated water and soil is of great significance. In this study, the functional biochar (FM-RBC and FM-DBC) was prepared using branch and durian shell biochar (RBC and DBC, respectively) with iron-manganese oxide (Fe–Mn oxide) modification. The behaviors and mechanisms of Cd adsorption and stabilization in water and alkaline soil treated with FM-RBC and FM-DBC were explored. The results showed that the adsorption capacities of RBC and DBC for Cd had increased by 40–80 mg/g after the Fe–Mn oxide modification. The Cd adsorption was conformed to pseudo-second-order kinetic and the Langmuir isothermal models. After 35 days of soil cultivation, the maximum reduction rate of DTPA-Cd occurred in 3% FM-DBC treatments (37.73%), followed by in 3% FM-RBC (30.08%), all of which were significantly higher than that observed in 3% BC treatments (12.55–18.91%). Notably, the FM-RBC and FM-DBC treatments promoted the conversion of the exchangeable to the carbonate-bound and Fe/Mn oxyhydroxide fractions of Cd. The XRD, FTIR, and XPS analyses demonstrated that the loading amount of Fe–Mn oxide was positively correlated with the oxygen-containing functional group of biochar. CdO, Cd2Mn3O8 and CdCO3 were loaded on the FM-BC, indicating the existence of two main adsorption mechanisms: (1) the complexation with M-O (M: Fe, Mn) and acid oxygen-containing functional groups, (2) the precipitation with carbonate of Cd. In this work, we prepared two functional biochar that rapidly removes Cd from water and effectively fixes Cd in alkaline soil, thus, debasing the risk of Cd entry into the food chain.

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