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当前位置: 首页 > 文章 > 绿色合成纳米铁对污染土壤中砷的钝化效果 湖北农业科学 2020 (4) 54-58
Position: Home > Articles > Immobilization effects of arsenic in soil by green synthesized iron nanoparticles Hubei Agricultural Sciences 2020 (4) 54-58

绿色合成纳米铁对污染土壤中砷的钝化效果

作  者：
黎亮;杨秀锋;张忠海
单  位：
湖南师范大学资源与环境科学学院
关键词：
绿色合成;纳米铁;砷;原位钝化
摘  要：
为实现对砷(As)污染土壤的高效修复,利用桉树叶提取液合成纳米铁颗粒悬浊液(EL-nFe),分析其对溶液中As(Ⅲ)、As(Ⅴ)的吸附性能,在此基础上利用化学法重点评估其对重度As污染土壤的钝化效果。结果表明,EL-nFe对As(Ⅲ)、As(Ⅴ)的吸附过程符合准一级动力学和Langmuir等温吸附模型,其对As(Ⅲ)、As(Ⅴ)的最大吸附量分别为8.08和24.68 mg/g。施加EL-nFe后的土壤As的浸出性和生物有效性显著降低,SPLP-As和KH_2PO_4提取的生物有效性As分别下降33.26%～52.42%和6.57%～14.21%,同时土壤连续提取的结果显示,EL-nFe促使土壤易溶态As向生物利用率较低的残渣态As转变,提高了土壤As的稳定化程度。因此,EL-nFe对土壤As具有良好的钝化效果,且成本较低,可作为一种良好的修复重度As污染土壤的钝化剂。
译  名：
Immobilization effects of arsenic in soil by green synthesized iron nanoparticles
作  者：
LI Liang;YANG Xiu-feng;ZHANG Zhong-hai;College of Resources and Environmental Science,Hunan Normal University;College of Urban and Environmental Science,Central China Normal University;School of Geography and Environment,Jiangxi Normal University;
关键词：
green synthesis;;iron nanoparticles;;arsenic;;in-situ immobilization
摘  要：
In order to achieve efficient remediation of arsenic(As) contaminated soil, the suspension of iron nanoparticles(EL-nFe) was prepared by eucalyptus leaves extract. The sorption capacities of EL-nFe for As(Ⅲ) and As(Ⅴ) were investigated. Chemical methods were further used to study the immobilization effects of severe As-contaminated soil by EL-nFe. The results showed that the adsorption process of As(Ⅲ) and As(Ⅴ) by EL-nFe could be well described by the pseudo-first-order and Langmuir isothermal adsorption model. The maximum adsorption capacities of EL-nFe for As(Ⅲ) and As(Ⅴ) were 8.08 and 24.68 mg/g, respectively. The soil after application of EL-nFe significantly reduced the leachability and bioavailability of soil As. The extraction of As by SPLP and the extraction of bioavailable As by KH_2PO_4 decreased by 33.26%～52.42% and 6.57% ～14.21%, respectively. At the same time, the result of soil sequential extraction showed that EL-nFe promoted the transformation of soil soluble As to the low bioavailability of residual As, which improved the degree of stabilization of As in the soil. Therefore, EL-nFe had a good immobilization effect on soil As and the cost was low, which can be used as a good passivation agent for severe As-contaminated soil.

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