摘要
为探究炭基@零价铁/氯磷灰石复合材料对铅镉污染土壤的钝化效果及其对植物吸收重金属的影响,通过土培实验和盆栽试验,考察了复合材料对土壤pH、阳离子交换量(CEC)、有机质(OM)含量以及土壤中Pb、Cd赋存形态的影响.结果显示,炭基@零价铁/氯磷灰石复合材料显著提高了土壤的pH、CEC和OM含量,将Pb和Cd从酸可提取态和可还原态转化为可氧化态和残渣态,苋菜作物地上部分和根部Pb含量分别降低了31.94%和38.34%,Cd含量分别降低了63.68%和49.45%.进一步分析显示,土壤中酸可提取态和残渣态Pb、Cd含量与苋菜体内重金属含量具有显著相关性(P<0.05).结果表明,该复合材料在钝化土壤中活性态铅镉、改善土壤理化特性及降低植物重金属吸收方面具有良好应用前景,对铅镉重金属污染土壤的修复具有一定的应用潜力.
To investigate the immobilization effects of biochar-supported nano zero-valent iron/chlorapatite composite on lead(Pb)and cadmium(Cd)contamination in soil,as well as its influence on plant heavy metal uptake,a series of soil incubation and pot experiments were conducted.The study examined the impact of the composite on soil pH,cation exchange capacity(CEC),organic matter(OM)content,and the speciation of Pb and Cd in soil.The results demonstrated that the composite significantly increased soil pH,CEC,and OM content while transforming Pb and Cd from acid-extractable and reducible forms to oxidizable and residual forms.The Pb content in the above-ground and root tissues of amaranth plants decreased by 31.94%and 38.34%,respectively,while the Cd content decreased by 63.68%and 49.45%,respectively.Further analysis revealed significant correlations(P<0.05)between the acid-extractable and residual fractions of Pb and Cd in soil and the heavy metal content in amaranth plants.These findings suggest that the biochar-supported zero-valent iron/chlorapatite composite exhibits excellent potential for immobilizing active Pb and Cd in soil,improving soil physicochemical properties,and reducing heavy metal uptake by plants.These composites hold promise for the remediation of Pb and Cd-contaminated soils.
作者
李佳毅
余江
丁萍
罗洁
袁菡
曾子馨
LI Jia-yi;YU Jiang;DING Ping;LUO Jie;YUA Han;ZENG Zi-Xin(College of Architecture and Environment,Sichuan University,Chengdu 610065,China;Institute of New Energy and Low Carbon Technology,Sichuan University,Chengdu 610065,China;Yibin Institute of Industrial Technology,Sichuan University,Yibin 644000,China)
出处
《环境科学》
北大核心
2025年第12期8021-8028,共8页
Environmental Science
基金
国家重点研发计划项目(2018YFC1802605)
四川省区域创新项目(2022YFQ0081)。
