| 聚合氯化铝铁改性凹凸棒石对Cd污染土壤的钝化修复效应 |
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| 引用本文： | 任珺,王艺蓉,任汉儒,仝云龙,王彤玉,陶玲.聚合氯化铝铁改性凹凸棒石对Cd污染土壤的钝化修复效应[J].环境工程,2022,40(7):123-131. |
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| 作者姓名： | 任珺 王艺蓉 任汉儒 仝云龙 王彤玉 陶玲 |
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| 作者单位： | 1. 兰州交通大学 甘肃省黄河水环境重点实验室, 兰州 730070; |
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| 基金项目： | 甘肃省教育厅产业支撑计划项目(2021CYZC-31)甘肃省科技支撑计划(20JR2RA002)兰州交通大学大学生科技创新项目(DXS-KJCX-2019-08,09) |
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| 摘 要： | 土壤重金属Cd具有难降解、易迁移和累积性强等特点,会破坏土壤环境,威胁粮食安全。将聚合氯化铝铁负载到凹凸棒石上,制备5种聚合氯化铝铁改性凹凸棒石新型钝化材料,通过扫描电镜(SEM)表征实验、钝化实验和玉米盆栽实验评价聚合氯化铝铁改性凹凸棒石对土壤Cd的钝化效果和环境风险。结果表明:将聚合氯化铝铁改性凹凸棒石施用于土壤中,能显著降低污染土壤二乙烯三胺五乙酸(DTPA)提取态Cd和毒性特征浸出态(TCLP) Cd的浓度。其中,掺入聚合氯化铝铁比例(质量分数)为25%的改性凹凸棒石处理土壤中2种生物有效态Cd的含量降幅最大,分别为21.51%和22.19%。改性凹凸棒石的施用促进了玉米幼苗的生长,聚合氯化铝铁掺入比例为25%时钝化效果最佳,玉米幼苗茎长较对照组增加了52.2%,玉米幼苗茎、根鲜生物量较对照组分别增加了75.1%和64.5%,茎、根干生物量较对照组分别增加了80.5%和79.7%,玉米幼苗茎、根Cd的含量较对照组分别下降了43.4%和24.7%。聚合氯化铝铁改性凹凸棒石具有较大比表面积、良好的离子交换能力和表面络合性能,显著降低了土壤重金属的生物有效性,可应用于Cd污染农田土壤的钝化修复。
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| 关 键 词： | 凹凸棒石 钝化修复 重金属污染 生态风险 土壤 |
| 收稿时间： | 2021-10-09 |
STABILIZATION REMEDIATION OF Cd-POLLUTED SOILS USING ATTALPULGITE |
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| Affiliation: | 1. Key laboratory of Yellow River Water Environment in Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, China;2. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Institute of Environmental Ecology, Lanzhou 730070, China;3. Gansu Hanxing Environmental Protection Co., Ltd, Lanzhou 730070, China;4. College of Atmospheric Sciences, Lanzhou University, Lanzhou 730070, China |
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| Abstract: | Cadium in soil has the characteristics of difficult degradation,easy migration accumulation,and is easily to cause damage to the soil environment and threatens food security.Five kinds of new stabilization materials were prepared by loading poly-aluminum ferric chloride on attapulgite.Scanning electron microscope (SEM) characterization,stabilization experiment and corn pot experiment were conducted to evaluate the stabilization effect and environmental risk of Cd in contaminated soil.The results showed that the concentrations of diethylenetriamine pentaacetic acid extracted Cd (DTPA),and toxic characteristic leached Cd (TCLP) were significantly reduced after the application of attapulgite modified with poly-aluminum ferric chloride.In the soil treated with attapulgite modified with a 25% mass ratio of poly-aluminum ferric chloride,the two bioavailable Cd concentrations decreased by 21.51% and 29.3%,respectively.The application of modified attapulgite promoted the growth of corn,and the treatment effect of modified attapulgite with 25% poly-aluminum ferric chloride was the best.In comparison to the control group,the shoot length of corn increased by 52.2%,and the fresh biomass of shoot and root increased by 75.1% and 64.5% respectively.Meanwhile,the dry biomass of shoot and root increased by 80.5% and 79.7% compared with CK.Furthermore,the content of Cd accumulated in the shoot and root of corn decreased by 43.4% and 24.7%,respectively.Attapulgite modified by poly-aluminum ferric chloride has larger specific surface area,higher ion exchange capacity and surface complexation properties,which greatly reduced the bioavailability of heavy metals in soil,so it could be used in stabilization remediation of Cd contaminated farmland soils. |
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