• 关键词：蒙脱石  镉  四环素  十二烷基二甲基甜菜碱

• 基金项目：国家自然科学基金资助项目(No.41472038,41273122,41073058);广东省科技计划项目(No.2014A020216002);中央高校基本业务费项目(No.2015ZP007)

• 杨林
• 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 污染控制与生态修复广东省教育厅重点实验室, 广州 510006

• 吴平霄
• 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 污染控制与生态修复广东省教育厅重点实验室, 广州 510006

• 刘帅
• 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 污染控制与生态修复广东省教育厅重点实验室, 广州 510006

• 陈理想
• 1. 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 污染控制与生态修复广东省教育厅重点实验室, 广州 510006;2. 广平大学, 越南 广平 45000

• 祝雅杰
• 华南理工大学环境与能源学院, 工业聚集区污染控制与生态修复教育部重点实验室, 污染控制与生态修复广东省教育厅重点实验室, 广州 510006

• 黄柱坚
• 华南农业大学资源环境学院, 广州 510006

• 摘要：以两性表面活性剂十二烷基二甲基甜菜碱(BS-12)为改性剂制备两性修饰蒙脱石(BS-Mt),在单一体系和Cd²⁺+TC复合体系中研究其对Cd²⁺和四环素的吸附行为,同时利用XRD、FTIR、TG-DSC和Zeta电位对两性修饰蒙脱石进行表征分析.表征结果显示,BS-12已成功负载到蒙脱石上,改性后材料表面的负电荷增加;吸附实验结果显示,BS-Mt对Cd²⁺和四环素的吸附量较Mt有较大的提高;其中BS-Mt对Cd²⁺的吸附行为符合Langmuir等温吸附模型和准一级动力学模型,吸附机理主要为电荷吸附和螯合作用;BS-Mt对四环素的吸附随pH的升高而降低,吸附行为符合Freundlich等温吸附模型和准二级动力学模型,吸附机理主要为电荷吸附和物理吸附.在Cd²⁺+TC复合体系中Cd²⁺和TC会形成复合物,Mt和BS-Mt对四环素和Cd²⁺的吸附量比单一体系增加.

• Abstract：In this study, amphoteric surfactant dodecyl dimethyl betaine (BS-12) was used to modify montmorillonite (BS-Mt) and the adsorption of Cd²⁺ and tetracycline in the single Cd²⁺ or tetracycline(TC) system, Cd²⁺ plus TC complex system, by the prepared adsorbents were investigated. The Characteristics of the modified montmorillonite were performed by using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Thermogravimetric differential thermal analysis (TG-DSC) and Zeta potential analysis. It was found that BS-12 had intercalated successfully into montmorillonite interlayer. The introduction of BS-12 led to more negative charges on the surface of montmorillonite. In the pH ranging from 2 to 9, solution pH had a significant impact on the adsorption of both Cd²⁺ and TC. For the adsorption behavior for Cd²⁺, pseudo-first-order kinetics and Langmuir adsorption model fitted the experimental data well. the adsorption of Cd²⁺ was mainly attributed to chelation and electrostatic attraction. However, the adsorption of TC could be well described by pseudo-second-order kinetics and Freundlich isotherm, and the adsorption of TC were mainly due to physical adsorption and electrostatic attraction. In the Cd²⁺ plus TC complex system, the adsorption for Cd²⁺ and TC is higher than that in single systems. Overall, BS-Mt had superiority over Mt for the adsorption of both Cd²⁺ and tetracycline, suggesting it could be a promising adsorbent in the application of treating wastewater containing Cd²⁺ and tetracycline.

• Key words：montmorillonite  cadmium  tetracycline  dodecyl dimethyl betaine

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