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