Shao Pengling, Yin Hua, Li Yingchao, Cai Yuhao, Yan Caiya, Yuan Yibo, Dang Zhi
School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, Guangzhou 510006, China.
J Environ Sci (China). 2023 Apr;126:275-286. doi: 10.1016/j.jes.2022.05.025. Epub 2022 May 24.
Preparing materials for simultaneous remediation of anionic and cationic heavy metals contamination has always been the focus of research. Herein a biochar supported FeMnMg layered double hydroxide (LDH) composites (LB) for simultaneous remediation of copper and arsenic contamination in water and soil has been assembled by a facile co-precipitation approach. Both adsorption isotherm and kinetics studies of heavy metals removal by LB were applied to look into the adsorption performance of adsorbents in water. Moreover, the adsorption mechanisms of Cu and As by LB were investigated, showing that Cu in aqueous solution was removed by the isomorphic substitution, precipitation and electrostatic adsorption while As was removed by complexation. In addition, the availability of Cu and As in the soil incubation experiments was reduced by 35.54%-63.00% and 8.39%-29.04%, respectively by using LB. Meanwhile, the addition of LB increased the activities of urease and sucrase by 93.78%-374.35% and 84.35%-520.04%, respectively, of which 1% of the dosage was the best. A phenomenon was found that the richness and structure of microbial community became vigorous within 1% dosage of LB, which indirectly enhanced the passivation and stabilization of heavy metals. These results indicated that the soil environment was significantly improved by LB. This research demonstrates that LB would be an imaginably forceful material for the remediation of anionic and cationic heavy metals in contaminated water and soil.
制备用于同时修复阴离子和阳离子重金属污染的材料一直是研究的重点。在此，通过一种简便的共沉淀方法组装了一种生物炭负载的铁锰镁层状双氢氧化物（LDH）复合材料（LB），用于同时修复水和土壤中的铜和砷污染。应用LB对重金属去除的吸附等温线和动力学研究来考察吸附剂在水中的吸附性能。此外，研究了LB对铜和砷的吸附机制，结果表明水溶液中的铜通过同晶替代、沉淀和静电吸附被去除，而砷则通过络合作用被去除。另外，在土壤培养实验中，使用LB分别使铜和砷的有效性降低了35.54% - 63.00%和8.39% - 29.04%。同时，添加LB分别使脲酶和蔗糖酶的活性提高了93.78% - 374.35%和84.35% - 520.04%，其中1%的用量效果最佳。发现了一种现象，即在LB用量为1%时，微生物群落的丰富度和结构变得活跃，这间接增强了重金属的钝化和稳定化。这些结果表明LB显著改善了土壤环境。这项研究表明，LB将是一种极具潜力的材料，用于修复受污染水和土壤中的阴离子和阳离子重金属。
