National Demonstration Center for Environmental and Planning, College of Environment & Planning, Henan University, Kaifeng, 475004, China; Henan Engineering Research Center for Control & Remediation of Soil Heavy Metal Pollution, Henan University, Kaifeng, 475004, China.
National Key Laboratory of Human Factors Engineering, China Astronaut Research and Training Center, Beijing, 100094, China.
Ecotoxicol Environ Saf. 2021 Jan 1;207:111294. doi: 10.1016/j.ecoenv.2020.111294. Epub 2020 Sep 15.
Heavy metal contamination in soil has attracted great attention worldwide. In situ stabilization has been considered an effective way to remediate soils contaminated by heavy metals. In the present research, a multiple-modified biochar (BCM) was prepared to stabilize Cd and Cu contamination in two different soils: a farmland soil (JYS) and a vegetable soil (ZZS). The results showed that BCM was a porous-like flake material and that modification increased its specific surface area and surface functional groups. The incubation experiment indicated that BCM decreased diethylenetriaminepentaacetic (DTPA)-extractable Cd and Cu by 92.02% and 100.00% for JYS and 90.27% and 100.00% for ZZS, respectively. The toxicity characteristic leaching procedure (TCLP)-extractable Cd and Cu decreased 66.46% and 100.00% for JYS and 46.33% and 100.00% for ZZS, respectively. BCM also reduced the mobility of Cd and Cu in soil and transformed them to more stable fractions. In addition, the application of BCM significantly increased the soil dehydrogenase, organic matter content and available K (p < 0.05). These results indicate that BCM has great potential in the remediation of Cd- and Cu-contaminated soil.
重金属污染土壤已引起全球关注。原位稳定化被认为是修复重金属污染土壤的有效方法。本研究制备了一种多改性生物炭（BCM），用于稳定两种不同土壤（农田土壤 JYS 和蔬菜土壤 ZZS）中的 Cd 和 Cu 污染。结果表明，BCM 是一种多孔片状材料，改性增加了其比表面积和表面官能团。培养实验表明，BCM 使 JYS 中 DTPA 可提取的 Cd 和 Cu 分别降低了 92.02%和 100.00%，使 ZZS 中 DTPA 可提取的 Cd 和 Cu 分别降低了 90.27%和 100.00%。TCLP 可提取的 Cd 和 Cu 分别降低了 66.46%和 100.00%，对 JYS 和 46.33%和 100.00%，对 ZZS。BCM 还降低了土壤中 Cd 和 Cu 的迁移率，并将其转化为更稳定的形态。此外，BCM 的应用显著增加了土壤脱氢酶、有机质含量和有效钾（p<0.05）。这些结果表明，BCM 在修复 Cd 和 Cu 污染土壤方面具有很大的潜力。
