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有机改性蒙脱石负载巯基修复汞污染土壤
Mercury containing soils stabilized using organic modify montmorillonite loading by thiol-based material
投稿时间:2018-07-16  修订日期:2018-09-15
DOI:
中文关键词:  土壤修复  蒙脱石  有机改性  巯基  稳定化  
英文关键词:Soil remediation  montmorillonite  Organic modified  Thiol group  Stabilization  Mercury
基金项目:
作者单位E-mail
王亚玲 东北大学冶金学院 1824659032@qq.com 
李述贤 东北大学冶金学院  
杨合 东北大学冶金学院 yangh@smm.neu.edu.cn 
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中文摘要:
      【目的】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。【方法】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(Mont),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。【结果】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。当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在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。【结论】实验结果证明有机改性蒙脱石负载巯基能够有效的应用于汞污染土壤修复。
英文摘要:
      The thiol functionalized montmorillonite modified by organic surfactant used in this study was obtained by grafting the thiol group (-SH) to the montmorillonite modified by organic surfactant and it was used to stabilized soils. The effects of stabilization time, stabilizer dosage, leaching pH and organic matter content on stabilization were investigated and the changes of mercury in soils before and after stabilization were explored. The physicochemical characteristics were analyzed by XRD, FTIR and SEM, confirming that the Mont was successfully functionalized, while the concentration of mercury stabilized was analyzed by the Atomic Absorption method. The stabilization results indicated that when the stabilization time is 30 d and the stabilizer addition is 9%, the mercury leaching concentration is 0.066 mg ? L-1, the stabilization efficiency is 98.3%, and the mercury limit of 0.10 mg ? L-1 as specified in GB 5085.3-2007 is reached. Adding wheat stalk can promote the stabilization and when the dosage is 6%, the promotion effect is most obvious. When the leaching pH is changed, the stabilizing effect under strong acidic and strong alkaline conditions. The results of TESSIER five-step extraction method show that the mercury content of exchangeable mercury, carbonate-bound mercury and iron-manganese oxide are decreased, and the content of organically bound mercury and residual mercury are increased. The results show that organic modify montmorillonite loading by thiol-based material can be effectively applied to remediate mercury contaminated soils.
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