• 关键词：SDS  有机蒙脱石  吸附  Cu²⁺  Cd²⁺

• 基金项目：国家自然科学基金项目(No.40573064);教育部新世纪优秀人才支持计划(No.NCET-06-0747);广东省科技计划项目(No.2008B030302036,2006B36601004);广东省自然科学基金项目(No.06025666)

• 周建兵
• 华南理工大学环境科学与工程学院, 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006

• 吴平霄
• 华南理工大学环境科学与工程学院, 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006

• 朱能武
• 华南理工大学环境科学与工程学院, 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006

• 党志
• 华南理工大学环境科学与工程学院, 工业聚集区污染控制与生态修复教育部重点实验室, 广州 510006

• 摘要：以阴离子表面活性剂(十二烷基磺酸钠,SDS)为改性剂制备了有机蒙脱石,研究其对Cu²⁺、Cd²⁺的吸附行为,并用XRD、FTIR、SEM、XPS对有机蒙脱石进行表征.实验结果表明,有机蒙脱石对Cu²⁺、Cd²⁺的吸附基本上在20min内达到平衡,并随pH增大(1.0～7.0),吸附量增加,最佳pH约为6.0.有机蒙脱石对Cu²⁺、Cd²⁺的吸附等温线更符合Langmuir等温吸附方程,SDS改性蒙脱石对Cu²⁺、Cd²⁺的最大吸附量较纯蒙脱石分别增加15.7%、15.5%.XRD、FTIR、SEM、XPS及碳含量分析结果显示,SDS主要分布在蒙脱石表面且相对稳定,少量嵌入层间,有机蒙脱石对Cu²⁺、Cd²⁺的吸附机制为配位吸附和离子交换.

• Abstract：The adsorption of Cu²⁺ and Cd²⁺ onto montmorillonite modified with an anionic surfactant (sodium dodecylsulfate,SDS) was investigated. The organic montmorillonite was examined by Fourier transform infrared spectroscopy (FTIR),X-ray diffraction (XRD),scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The adsorption of Cu²⁺ and Cd²⁺ onto montmorillonite reached equilibrium basically within 20 min,and the adsorption capacity increased with increasing solution pH (1.0～7.0) with the optimum pHbeing 6.0. The adsorption isotherms of Cu²⁺ and Cd²⁺ were modelled with the Langmuir equation. The maximum adsorption capacities for Cu²⁺ and Cd²⁺ onto SDS-modified montmorillonite were 15.7% and 15.5% more than onto purified montmorillonite. The results of XRD,FTIR,SEM,XPS and the analysis of carbon content revealed that the SDS was mainly distributed on the surface of montmorillonite,with a small amount intercalated into the interlayers. The mechanisms of adsorption of Cu²⁺ and Cd²⁺ onto organic montmorillonite were mainly coordination and ion exchange.

• Key words：SDS  organic montmorillonite  adsorption  Cu²⁺  Cd²⁺

• 
  摘要点击次数： 2958 全文下载次数： 3074