腐殖酸复配凹凸棒石对土壤Cd污染的钝化效果

Stabiliation Efficiency of Cd in Soil Treated by Attalpulgite Complexed with Humic Acid

将凹凸棒石与腐殖酸结合制备新型钝化材料,并测试其对土壤重金属Cd的钝化效果。结果表明,腐殖酸复配凹凸棒石产生了新的活性官能团,增强了其对重金属的吸附作用。腐殖酸和凹凸棒石质量比为1∶5时,能够将土壤pH值和电导率分别提高至7.31和366.00μS/cm。土壤中重金属Cd的酸溶态含量较对照组降低34.10%;重金属Cd的还原态和残渣态较对照组分别升高21.09%和63.13%。不同配比的腐殖酸与凹凸棒石材料均能降低土壤中Cd的环境风险因子和潜在风险指数,其中当腐殖酸与凹凸棒石的质量比为1∶5时,降低效果显著。综合表明,腐殖酸复配凹凸棒石能够作为有效的钝化材料来修复土壤中的重金属Cd污染。

A new passivation materials were carried out by attapulgite complexed with humic acid.The results showed that humic acid combined with attapulgite produced new active functional groups,which may enhance its adsorption of heavy metals.When the mass ratio of humic acid to attapulgite was 1∶5,the pH value and conductivity of soil could be significantly increased to 7.31 and 366.1μS/cm,respectively.The acid soluble content of heavy metal Cd in soil decreased by 34.10%compared with control group.The reduced and residual levels of heavy metal Cd were increased by 21.09%and 63.13%compared with the control group,respectively.Different proportions of humic acid and attapulgite materials could reduce the environmental risk factors and potential risk index of Cd in soil,and the effect was significant when the mass ratio of humic acid to attapulgite was 1∶5.Humic acid combined with attapulgite could be used as an effective passivation material to repair heavy metal Cd pollution in soil.