磁性纳米膨润土治理镉污染土壤的试验研究

Research on Control of Cadmium-contaminated Soil by Magnetic Nano-bentonite

采用盆栽试验模拟矿区镉污染场地土壤钝化修复过程,通过对比分析磁性纳米膨润土和纳米膨润土不同添加量对土壤中Cd的钝化修复效果。结果表明:2种钝化材料均降低了土壤有效态Cd含量及抑制了高羊茅对Cd的富集,且随着添加量的增加降低作用增强。磁性纳米膨润土对土壤有效态Cd的钝化效果比纳米膨润土平均高42.37%;在0.4%添加量磁性纳米膨润土和0.6%添加量纳米膨润土下,高羊茅Cd富集率显著低于CK处理,降低比例分别为9.74%、8.09%。因此,磁性纳米膨润土对矿区镉污染土壤的钝化修复效果显著,在治理污染土壤方面应用潜力广阔。

A pot experiment was conducted to simulate the passivation process of cadmium(Cd)-contaminated soil in mining site.The comparative analysis focused on the passivation and remediation effects of magnetic nano-bentonite and nano-bentonite on soil Cd at different application rates.The results showed that both passivating materials effectively reduced soil Cd bioavailability and inhibited enrichment of Cd in Festuca elata,with reduction effect reduced as the addition increased.In addition,the passivation effect of magnetic nano-bentonite on soil Cd bioavailability was found to be 42.37% higher than that of nano-bentonite.Moreover,under treatments with 0.4% magnetic nano-bentonite and 0.6% nano-bentonite,the enrichment ratio of Cd in Festuca elata exhibited significantly lower,compared with the control group(CK),resulting in reduction ratios of 9.74% and 8.09%,respectively.Therefore,these findings highlighted the remarkable efficacy of magnetic nano-bentonite for restoring Cd-contaminated soils in mining site,showcasing its extensive potential of treating contaminated soil.