研究报告

  • 杨林,吴平霄,刘帅,陈理想,祝雅杰,黄柱坚.两性修饰蒙脱石对水中镉和四环素的吸附性能研究[J].环境科学学报,2016,36(6):2033-2042

  • 两性修饰蒙脱石对水中镉和四环素的吸附性能研究
  • Adsorption of Cd(Ⅱ) and tetracycline by amphoteric surfactants modified montmorillonite
  • 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)
  • 作者
  • 单位
  • 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.

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