【摘要】 为了解Cd在不同土壤类型中的吸附特性,通过批量平衡吸附试验,探究了重金属Cd在吉林省盐碱土、黑土和白浆土3种典型土壤中的吸附行为及不同影响因素对Cd吸附特性的影响。结果表明:Cd在3种土壤中的吸附过程用Langmuir模型拟合最优,且对Cd的最大吸附量顺序为盐碱土>黑土>白浆土;与准一级动力学方程相比,准二级动力学方程对3种土壤吸附Cd的拟合效果更好,说明3种土壤对Cd的吸附过程是多重吸附共同作用的结果;Cd在3种土壤中的吸附均为自发、吸热和无序反应;在试验pH范围内（3.0～11.0）,3种土壤对Cd的吸附量呈现先增加后趋于平衡的趋势;Al³⁺和Ca²⁺浓度的增加均使3种土壤对Cd的吸附量减少;添加生物质炭后3种土壤对Cd的吸附量增加。更多还原

【Abstract】 In order to determine the adsorption characteristics of Cd and the various influencing factors in different soils, mass equilibrium adsorption experiments were conducted in saline-alkali soil, black soil, and planosol. The results indicated that the Langmuir model explained adsorption in the three types of soils. Maximum Cd adsorption occurred in saline-alkali soil, followed by black soil then planosol.The pseudo-second-order kinetic equation had a better fitting effect than the pseudo-first-order kinetic equation for Cd adsorption in the three soils. Cd adsorption in the soils was spontaneous, endothermic, and random. Within a pH range of 3.0～11.0, Cd adsorption in the three soils first increased then became more stable. By increasing the concentration of Al³⁺ and Ca²⁺, Cd adsorption decreased in the soils whereas adding biomass charcoal increased Cd absorption. These results can be used to understand the adsorption behavior of Cd in different soils and provide a theoretical basis for Cd-contaminated soil remediation.更多还原