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Remediation performance and mechanisms of cu and cd contaminated water and soil using Mn/Al-layered double oxide-loaded biochar

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Journal of Environmental Sciences 2023年第3期125卷 593-602页

作者： Pengcheng Lin Hang Liu Hua Yin Minghan Zhu Haoyu Luo Zhi Dang School of Environment and Energy South China University of TechnologyGuangzhou 510006China Key Laboratory of Ministry of Education on pollution Control and Ecosystem Restoration in Industry Clusters Guangzhou 510006China Guangdong Provincial Key Laboratory of Solid Wastes pollution Control and Recycling Guangzhou 510006China

The combined pollution of heavy metals is ubiquitous ***/Al-layered double oxide-loaded crab shells biochar (LDO/BC) was prepared,so as to remediate the combined pollution of cd and cu in soil and *** pristine and used LDO/BC were characterized and the results revealed that the layered double oxide was successfully loaded on crab shells biochar (BC) and metal element Ca in crab shells was beneficial to the formation of more regular layered and flake *** maximal adsorption capacity (Qm) of LDO/BC for aqueous cu^(2+)and cd^(2+)was 66.23 and 73.47 mg/g,***/BC and BC were used to remediate e-waste-contaminated soil for the first time and exhibited highly efficient *** extraction amount of cu and cd in the contaminated soil by diethylene triamine penta-acetic acid (DTPA) after treating with 5% LDO/BC was significantly reduced from 819.84 to 205.95 mg/kg (with passivation rate 74.8%) and 8.46 to 4.16 mg/kg(with passivation rate 50.8%),respectively,inferring that the bioavailability of heavy metals declined *** experimental result also suggested that after remediation by LDO/BC the exchangeable and weak acid soluble cu and cd in soil translated to reducible,residual and oxidizable fraction which are more stable ***,complexation and ion exchange were proposed as the possible mechanisms for cd and cu *** general,these experiment results indicate that LDO/BC can be a potentially effective reagent for remediation of heavy metal contaminated water and soil.

关键词： Mn/Al-layered double oxide Biochar cd and cu combined pollution Adsorption Soil remediation

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