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In this work, vermicompost was prepared with maize stover and cattle dung in ratios of 60:40 (VC 1 ), 50:50 (VC 2 ) and 40:60 (VC 3 ), and the physicochemical properties of the vermicompost were related to the ratio of the raw materials used. The effect of the vermicomposts on the adsorption kinetics, adsorption isotherms and desorption of atrazine were investigated in unamended soil (S) and soil amended with 4% (w/w) of VC 1 (S-VC 1 ), VC 2 (S-VC 2 ) and VC 3 (S-VC 3 ). The total organic carbon (TOC) content of VC 1 , VC 2  and VC 3  was 38.46, 37.33 and 34.47%, the HA content was 43.50, 42.22 and 39.28 g/kg, and the HA/FA ratios was 1.47, 0.44 and 0.83, respectively. The adsorption of atrazine on the soil, on the vermicompost and on soils amended with vermicompost followed a pseudo-second-order kinetic model. The Freundlich equation better fitted the adsorption isotherm of atrazine. The vermicomposts enhanced atrazine adsorption and decreased atrazine desorption. Correlation analysis showed that the TOC and HA were significantly positively correlated with  K f, which indicated that TOC and HA of the vermicomposts contributed significantly to the adsorption and desorption of atrazine. This study demonstrated that vermicomposts have great potential in the bioremediation of atrazine pollution and that their role is related to the raw materials used to prepare them.

Adsorption–desorption characteristics of atrazine on soil and vermicompost prepared with different ratios of raw materials