Application of Chitosan Modified Biochar in the Remediation of Lead Cadmium Composite Polluted Soil
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.
NETL
NSTL
万方数据
