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To explore the remediation mechanism and effect of biochar and KH 2 PO 4 on soils contaminated with heavy metal ions Hg 2+ , Cd 2+ and Pb 2 .

In this study, wheat straw-derived biochar was prepared by setting a temperature of 400 °C under an oxygen-limited environment using the technique of "programmed temperature increase control". The results showed that the biochar had a strong adsorption capacity for Hg2+ , Cd2+ and Pb2+ ions, and the adsorption pattern was Hg2+ >Cd2+ >Pb2+ . There was a competitive adsorption effect during the coexistence of the ions. The results of the soil remediation tests showed that the effects of biochar on soil physicochemical properties and heavy metal distribution was generally greater than those of KH2 PO4 in single or combined contaminated soil. The adsorption effect of heavy metal ions in soil was the best in the case of mixed additions. The results can provide a scientific basis for the treatment of heavy metal contaminated soil with wheat straw biochar in the future.

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