In order to achieve the remediation of lead cadmium composite polluted soil,rice husk biochar(BR)and corn cob biochar(BM)were prepared using high-temperature pyrolysis method.Chitosan was used to modify the biochar,and the remediation effect of different biochars on lead cadmium composite polluted soil was studied.The results indicate that chitosan modified biochar has a larger specific surface area and a much higher effect on improving pH and soil conductivity than unmodified biochar.During the remediation process,the five forms of lead and cadmium in the soil showed a trend of residual state>carbonate bound state>iron manganese bound state>organic bound state>water-soluble state.Various types of biochar showed a passivation effect on heavy metal lead and cadmium in the soil,and chitosan modified biochar had a better passivation effect.
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