用于吸附甲基橙的阳离子水溶性柱[5]芳烃修饰沸石的制备与表征
Preparation and Characterization of Cationic Water-Soluble Pillar[5]arene-Modified Zeolite for Adsorption of Methyl Orange.
作者信息
Yang Yunhan, Yang Junli, Du Yao, Li Canhua, Wei Keke, Lu Jiajia, Chen Wen, Yang Lijuan
机构信息
School of Chemistry & Environment, Key Laboratory of Intelligent Supramolecular Chemistry at the University of Yunnan Province, National and Local Joint Engineering Research Center for Green Preparation Technology of Biobased Materials, Yunnan Minzu University, Kunming 650500, P. R. China.
Key Laboratory of Medicinal Chemistry for Natural Resources, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China.
出版信息
ACS Omega. 2019 Oct 18;4(18):17741-17751. doi: 10.1021/acsomega.9b02180. eCollection 2019 Oct 29.
A novel quaternary cationic pillar[5]arene-modified zeolite (WPA5/zeolite) was prepared via charge interaction between the cationic WPA5 and natural zeolite and characterized by scanning electron microscopy (SEM), Fourier transform infrared absorption spectroscopy, X-ray diffraction, solid-state nuclear magnetic resonance, and thermogravimetric (TG) analysis. The effects of zeolite particle size, WPA5 concentration, adsorption time, initial concentration, and pH on the removal of methyl orange (MO) were studied. The SEM and XRD results revealed a strong interaction between WPA5 and natural zeolite, and the modified composites showed novel microscopic morphology and structural properties. TG analysis indicated excellent thermal stability of the composite. MO was removed via electrostatic adsorption, and the removal efficiency was 84% at an initial concentration of 100 mg/L. Increase in the initial dye concentration enhanced the adsorption capacity of WPA5/zeolite and decreased the removal of MO. Based on the adsorption kinetics, the pseudo-second-order model ( = 0.998) described the kinetic behavior of MO on WPA5/zeolite. In addition, UV and fluorescence spectra revealed that MO and WPA5 are complexed by a 1:1 complex ratio, and the binding constant between them was 12 595 L·mol. NMR and molecular docking also verified their interaction. Therefore, the potential application of the prepared composite includes removal of organic anionic dyes.
通过阳离子WPA5与天然沸石之间的电荷相互作用制备了一种新型的季铵盐阳离子柱[5]芳烃修饰沸石（WPA5/沸石），并通过扫描电子显微镜（SEM）、傅里叶变换红外吸收光谱、X射线衍射、固体核磁共振和热重（TG）分析对其进行了表征。研究了沸石粒径、WPA5浓度、吸附时间、初始浓度和pH对甲基橙（MO）去除率的影响。SEM和XRD结果表明WPA5与天然沸石之间存在强烈的相互作用，改性复合材料呈现出新颖的微观形态和结构特性。TG分析表明该复合材料具有优异的热稳定性。MO通过静电吸附被去除，在初始浓度为100 mg/L时去除效率为84%。初始染料浓度的增加提高了WPA5/沸石的吸附容量，但降低了MO的去除率。基于吸附动力学，准二级模型（ = 0.998）描述了MO在WPA5/沸石上的动力学行为。此外，紫外和荧光光谱表明MO与WPA5以1:1的络合比络合，它们之间的结合常数为12595 L·mol。核磁共振和分子对接也证实了它们之间的相互作用。因此，制备的复合材料的潜在应用包括去除有机阴离子染料。
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