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.

土壤中的重金属污染已引起全世界的广泛关注。原位稳定化被认为是补救被重金属污染的土壤的有效方法。在本研究中，制备了多种改性生物炭（BCM）以稳定两种不同土壤中的Cd和Cu污染：农田土壤（JYS）和蔬菜土壤（ZZS）。结果表明，BCM是一种多孔状薄片材料，改性后增加了其比表面积和表面官能团。孵育实验表明，BCM使JYS的可萃取二亚乙基三胺五乙酸（DTPA）萃取的Cd和Cu分别降低92.02％和100.00％，而ZZS降低90.27％和100.00％。毒性特征浸出程序（TCLP）可提取的镉和铜分别对JYS和ZZS分别降低66.46％和100.00％和ZZS降低46.33％和100.00％。BCM还降低了Cd和Cu在土壤中的迁移率，并将其转化为更稳定的馏分。此外，BCM的应用显着增加了土壤脱氢酶，有机质含量和有效钾（p  ＜0.05）。这些结果表明，BCM具有修复Cd和Cu污染土壤的巨大潜力。