水滑石的有机改性及吸附性能研究  

Study on organic modification and adsorption properties of hydrotalcite

作　　者：罗丹丹 原金海[1] 彭英 莫丽琼 许静[1] 奚锐 周婧 曾诚 LUO Dandan;YUAN Jinhai;PENG Ying;MO Liqiong;XU Jing;XI Rui;ZHOU Jing;ZENG Cheng(College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology,Chongqing 401331, China)

机构地区：[1]重庆科技学院化学化工学院,重庆401331

出　　处：《功能材料》2021年第1期1161-1166,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(No.51708075);重庆市教委科学技术研究资助项目(KJ1713335)。

摘　　要：采用十六烷基三甲基溴化铵(CTMAB)对镁铝水滑石(LDH)进行有机改性,通过XRD、SEM、Raman mapping等表征证明改性水滑石(C-LDH)具有良好的层间结构,改性剂CTMAB进入了水滑石内部。利用LDH和C-LDH分别对有机污染物(直接黑G)和重金属离子(Pb^2+、Cr6+、Zn^2+、Cu^2+)的吸附能力进行考察,结果表明C-LDH对直接黑G和重金属离子吸附能力相比未改性前均有所提高。C-LDH对直接黑G和重金属离子同步吸附试验结果表明,其对直接黑G和Cr6+离子是协同吸附,对Pb^2+、Cu^2+、Zn^2+离子的是竞争吸附。通过C-LDH吸附过程的热力学和动力学模型分析,C-LDH对直接黑G、Pb^2+、Cu^2+、Zn^2+离子的吸附过程较符合Freundlich等温吸附模型,Cr6+离子的吸附过程符合Langmuir等温吸附模型;C-LDH对直接黑G和重金属离子的吸附行为符合准一级动力学方程。Cetyltrimethylammonium bromide(CTMAB)was used to organically modify the magnesium aluminum hydrotalcite(LDH).XRD,SEM,Raman mapping and other characterizations proved that the modified hydrotalcite(C-LDH)had a good layer in the structure,and the modifier CTMAB entered the inside of the hydrotalcite.LDH and C-LDH were used to investigate the adsorption capacity of organic pollutants(direct black G)and heavy metal ions(Pb^2+、Cr6+、Zn^2+、Cu^2+).It proved that the adsorption capacity of C-LDH for direct black G and heavy metal ions was improved compared with that before modification.The results of simultaneous adsorption experiments of C-LDH on direct black G and heavy metal ions showed that it was a cooperative adsorption on direct black G and Cr6+ions,but a competitive adsorption on Pb^2+,Cu^2+and Zn^2+ions.According to the thermodynamic and kinetic model analysis of the C-LDH adsorption process,the adsorption process of C-LDH for direct black G,Pb^2+,Cu^2+and Zn^2+ions was more in line with the Freundlich isotherm adsorption model,and the Cr6+ion adsorption process was in accordance with the Langmuir isotherm adsorption model.The adsorption behavior of-LDH to direct black G and heavy metal ions conformed to the quasi-first-order kinetic equation.

关 键 词：镁铝水滑石 有机改性 吸附性能 直接黑G 重金属离子 

分 类 号：O614[理学—无机化学]