摘要：To well prevent and control agricultural diffuse pollution,this study selected com stalk,wheat straw,com cob and rice straw to prepare biochars,which were modified by ultrasonic and sulfuric acid.The four modified biochars were used to reduce the agricultural cadmium diffuse loss from arable soil based on series of isothermal adsorption experiments.The results showed that the best application ratio was 200 mg 3% modified biochar-amended soil to 20 mL cadmium solution with a removal efficiency of 50%.The maximum apparent adsorption capacities of cadmium were in a range of 4.21-10.6 mg/g.Interestingly,the adsorption capacity of modified soil for cadmium did not positively correlated with the biochar dosages.This study provides an economic and environmental protection technology for solving agricultural diffuse heavy metal pollution problem prohibiting agricultural environmental protection in the actual environment.
