• 关键词：钢渣  蒙脱石  Cd²⁺  吸附

• 基金项目：国家自然科学基金(No.31171997);辽宁省教育厅高等学校科研项目(No.2008S210)

• 田犀卓
• 沈阳农业大学土地与环境学院, 辽宁省农业资源与环境重点实验室, 沈阳 110866

• 金兰淑
• 沈阳农业大学土地与环境学院, 辽宁省农业资源与环境重点实验室, 沈阳 110866

• 应博
• 沈阳农业大学土地与环境学院, 辽宁省农业资源与环境重点实验室, 沈阳 110866

• 林国林
• 沈阳农业大学土地与环境学院, 辽宁省农业资源与环境重点实验室, 沈阳 110866

• 赵云龙
• 沈阳农业大学土地与环境学院, 辽宁省农业资源与环境重点实验室, 沈阳 110866

• 摘要：研究了钢渣-蒙脱石复合吸附剂对废水中Cd²⁺的吸附性能,并探讨了影响吸附的因素和吸附机理.结果表明,钢渣蒙脱石质量比为1:1的复合吸附剂对Cd²⁺的吸附效果优于钢渣及蒙脱石对Cd²⁺的单一吸附.当温度为25 ℃,废水pH=6~7时,1.2 g钢渣-蒙脱石复合吸附剂对100 mL Cd²⁺溶液(100 mg·L^-1)吸附60 min后,Cd²⁺的去除率可达到96.99%.钢渣-蒙脱石复合吸附剂对镉离子的吸附反应符合二级动力学方程,可决系数为0.9991;符合Langmuir方程,可决系数为0.9725.对Cd²⁺的理论饱和吸附量为12.45 mg·g^-1.溶液中Pb²⁺、Cu²⁺的存在会降低复合吸附剂对Cd²⁺的吸附量,且Cd²⁺受Cu²⁺的影响较大.吸附饱和的钢渣-蒙脱石颗粒材料用1 mol·L^-1的氯化钠溶液再生效果好.

• Abstract：The adsorption behavior of Cd²⁺ from aqueous solution was investigated using a composite adsorbent derived from steel slag and montmorillonite. The adsorption capacity of composite adsorbent was enhanced compared with that of the steel slag or montmorillonite alone. The removal rate of Cd²⁺ reached 96.99% at loading rate of 12 g·L^-1 composite adsorbent (initial Cd²⁺ concentration of 100 mg·L^-1) within 60 min in the condition of 25 degrees Celsius and pH value from 6 to 7. The coefficient of determination (R²=0.9991) agreed well with pseudo second-order kinetics. The adsorption isotherms of composite adsorbent for Cd²⁺ could be described by the Langmuir isotherm model (R²=0.9725). The value of maximum adsorption capacity was 12.45 mg·g^-1 based on the analysis of Langmuir model. Further analysis indicated that the Cd²⁺ adsorption was influenced by Pb²⁺ and Cu²⁺ ions, which occupied adsorptive sites on the adsorbent surface. And competitive effect of Cu²⁺ ions on Cd²⁺ adsorption was stronger than that of Pb²⁺ions in aqueous solution. The regeneration effect for the adsorbent was optimized using 1 mol·L^-1 NaCl solution.

• Key words：steel slag  montmorillonite  cadmium ion  adsorption

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