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环境化学  2015 

蒙脱石-OR-SH复合体修复剂对重金属污染土壤中Cd的钝化效果

Keywords: 蒙脱石-RO-SH复合体,,形态,钝化

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Abstract:

利用溶剂分散法成功地将功能基团-SH嫁接到蒙脱石上,得到蒙脱石-OR-SH复合体材料,该复合体材料对Cd的饱和吸附容量可达37.82mg·g-1(0.1mol·L-1KNO3体系)和69.13mg·g-1(不考虑离子浓度影响).通过小白菜盆栽和大田试验探讨了该复合体材料对Cd污染土壤的钝化效果.结果表明,在Cd污染土壤上施加蒙脱石-OR-SH复合体材料后,土壤中可交换态Cd形态占比分别低了64.51%(原土)和80.37%(3mg·kg-1Cd含量的成化土),铁锰氧化结合态Cd形态占比分别提升了176.66%(原土)和418.31%(3mg·kg-1Cd含量的成化土),降低了毒性元素Cd在土壤中的活性和可移动性,有效地固定了土壤中的Cd,小白菜中镉含量比对照分别降低了57.14%(原土)和60.64%(3mg·kg-1Cd含量的成化土),同时能促进小白菜的生长.

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