重金属的土壤污染带来了巨大的环境危险,有必要探索创新的补救方法。本研究旨在研究纳米二氧化硅在石灰性重金属污染土壤中稳定重金属的效率。用0、100、200、500和1000mg/kg的五种纳米二氧化硅水平处理土壤并孵育两个月。结果表明,纳米二氧化硅的比表面积为179.68m2/g。在1000mg/kg时,DTPA可提取的Pb浓度,Zn,Cu,Ni,Cr减少了12%,11%,11.6%,10%,与对照组相比为9.5%,分别。此外,随着纳米二氧化硅施用量的增加,土壤pH值和比表面积均增加。土壤中纳米二氧化硅吸附剂的增加导致Pb的可交换(EX)和碳酸盐结合部分的减少,Cu,Zn,Ni,和Cr,而重金属在与Fe-Mn氧化物键合的馏分中的分布,有机物,和残留物增加。使用1000mg/kg纳米二氧化硅可使EXPb减少8.0%,在EXCu中4.5%,7.3%的EXZn,7.1%的EXNi,与对照处理相比,EXCr含量为7.9%。总的来说,我们的研究强调了纳米二氧化硅作为解决污染土壤中重金属污染的有前途的修复策略的潜力,为环境恢复和生态系统保护提供可持续的解决方案。
Soil contamination with heavy metals presents a substantial environmental peril, necessitating the exploration of innovative remediation approaches. This research aimed to investigate the efficiency of nano-silica in stabilizing heavy metals in a calcareous heavy metal-contaminated soil. The soil was treated with five nano-silica levels of 0, 100, 200, 500, and 1000 mg/kg and incubated for two months. The results showed that nano-silica had a specific surface area of 179.68 m 2 / g . At 1000 mg/kg, the DTPA-extractable concentrations of Pb, Zn, Cu, Ni, and Cr decreased by 12%, 11%, 11.6%, 10%, and 9.5% compared to the controls, respectively. Additionally, as the nano-silica application rate increased, both soil pH and specific surface area increased. The augmentation of nano-silica adsorbent in the soil led to a decline in the exchangeable (EX) and carbonate-bound fractions of Pb, Cu, Zn, Ni, and Cr, while the distribution of heavy metals in fractions bonded with Fe-Mn oxides, organic matter, and residue increased. The use of 1000 mg/kg nano-silica resulted in an 8.0% reduction in EX Pb, 4.5% in EX Cu, 7.3% in EX Zn, 7.1% in EX Ni, and 7.9% in EX Cr compared to the control treatment. Overall, our study highlights the potential of nano silica as a promising remediation strategy for addressing heavy metal pollution in contaminated soils, offering sustainable solutions for environmental restoration and ecosystem protection.