王亚玲^1,,
李述贤^1,2,
杨合¹
1.东北大学冶金学院，沈阳110819
2.沈阳环境科学研究院，沈阳110167

Mercury contaminated soils remediation by using organic modified montmorillonite with sulfhydryl group loading

WANG Yaling^1,,
LI Shuxian^1,2,
YANG He¹
1.School of Metallurgy, Northeastern University, Shenyang 110819, China
2.Shenyang Academy of Environmental Sciences, Shenyang 110167, China

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摘要:以蒙脱石作为原始材料，对其进行有机改性，将巯基基团负载在有机改性的蒙脱石上制备出重金属汞的稳定剂以稳定化修复汞污染土壤。考察稳定化时间、稳定剂添加量、浸出液pH及有机质含量对稳定化效果的影响，探究稳定化前后土壤汞形态变化。通过XRD、FTIR和SEM分析了蒙脱石、有机改性蒙脱石（Mont-OR）和负载巯基有机改性蒙脱石（Mont-OR-SH）的物理化学特征，通过原子吸收法测定汞浓度。稳定化修复结果表明,稳定化时间为30 d，稳定剂添加量为9%时，汞浸出浓度为0.066 mg·L-1，稳定率为98.3%，达到GB 5085.3-2007规定的汞限值0.10 mg·L-1。添加不同质量的小麦秸秆作为有机质的来源，均对整个稳定化有促进作用，其中添加量为6%时，促进作用最明显，改变浸出液pH，在强酸性和强碱性条件下，利用此稳定剂对汞的稳定作用降低。TESSIER五步提取法结果表明，负载巯基的有机改性蒙脱石的添加导致可交换态汞、碳酸盐结合态汞、铁锰氧化物结合态汞含量下降，而有机结合态汞、残渣态汞含量增加。实验结果证明有机改性蒙脱石负载巯基能够有效地应用于汞污染土壤修复。
关键词: 土壤修复/
蒙脱石/
有机改性/
巯基/
稳定化/
汞

Abstract:In this study, a kind of mercury stabilizer was prepared through modifying montmorillonite with organic surfactant and grafting the sulfhydryl on it, which was used to remediate mercury contaminated soils. The effects of stabilization time, stabilizer dosage, leaching pH and organic matter content on the soil stabilization were investigated, as well as the changes of mercury species in soils before and after stabilization. The physicochemical characteristics of montmorillonite, organic modified montmorillonite (Mont-OR) and sulfhydryl group loaded montmorillonite with organic modification (Mont-OR-SH) were identified by XRD, FTIR and SEM, and the mercury concentration was analyzed by the atomic absorption method. The stabilization results indicated that the mercury leaching concentration and stabilization efficiency were 0.066 mg·L-1 and 98.3%, respectively, which meets the mercury limit of 0.10 mg·L-1 specified in GB 5085.3-2007 at the stabilization time of 30 d and 9% stabilizer dosage. Adding different mass wheat stalk as organic source could promote the stabilization and the most obvious promotion effect occurred at 6% dosage accordingly. When the leaching pH was changed, the mercury stabilizing effect with this stabilizer decreased under strong acidic and strong alkaline conditions. The results of TESSIER five-step extraction method show that Mont-OR-SH addition could lead to the decrease of contents for the exchangeable mercury, carbonate-bound mercury and iron-manganese oxide mercury, while the increase of contents for the organically bound mercury and residual mercury. The results show that organic modified montmorillonite with sulfhydryl group loading could be effectively applied to remediate mercury contaminated soils.
Key words:soil remediation/
montmorillonite/
organic modification/
sulfhydryl group/
stabilization/
mercury.

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刊出日期:2018-11-29

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有机改性蒙脱石负载巯基修复汞污染土壤

王亚玲^1,,
李述贤^1,2,
杨合¹
1.东北大学冶金学院，沈阳110819
2.沈阳环境科学研究院，沈阳110167
基金项目:
关键词: 土壤修复/
蒙脱石/
有机改性/
巯基/
稳定化/
汞
摘要:以蒙脱石作为原始材料，对其进行有机改性，将巯基基团负载在有机改性的蒙脱石上制备出重金属汞的稳定剂以稳定化修复汞污染土壤。考察稳定化时间、稳定剂添加量、浸出液pH及有机质含量对稳定化效果的影响，探究稳定化前后土壤汞形态变化。通过XRD、FTIR和SEM分析了蒙脱石、有机改性蒙脱石（Mont-OR）和负载巯基有机改性蒙脱石（Mont-OR-SH）的物理化学特征，通过原子吸收法测定汞浓度。稳定化修复结果表明,稳定化时间为30 d，稳定剂添加量为9%时，汞浸出浓度为0.066 mg·L-1，稳定率为98.3%，达到GB 5085.3-2007规定的汞限值0.10 mg·L-1。添加不同质量的小麦秸秆作为有机质的来源，均对整个稳定化有促进作用，其中添加量为6%时，促进作用最明显，改变浸出液pH，在强酸性和强碱性条件下，利用此稳定剂对汞的稳定作用降低。TESSIER五步提取法结果表明，负载巯基的有机改性蒙脱石的添加导致可交换态汞、碳酸盐结合态汞、铁锰氧化物结合态汞含量下降，而有机结合态汞、残渣态汞含量增加。实验结果证明有机改性蒙脱石负载巯基能够有效地应用于汞污染土壤修复。

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