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多级孔NH2-MIL-53(Al)的制备及其吸附性能
王林冲,刘 民,郭新闻
大连理工大学化工学院,辽宁 大连 116000
Preparation and Adsorption Properties of Hierarchical Pore NH2-MIL-53(Al)
WANG Linchong, LIU Min, GUO Xinwen
School of Chemical Engineering, Dalian University of Technology, Dalian 116000, China
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摘要 采用构造缺陷法制备多级孔NH2-MIL-53(Al),并采用粉末X射线衍射(XRD)、氮气/氩气物理吸附、扫描电子显微镜(SEM)、热重分析(TG)和傅里叶变换红外光谱(FT-IR)等对其进行表征。结果表明:制备所得的NH2-MIL-53(Al)具有微孔-介孔共存的多级孔结构。改变柠檬酸比例、溶剂比例等实验结果表明,多级孔形成的可能机理为晶化过程中金属源缺失,造成缺陷从而形成介孔。在水溶液中的盐酸四环素吸附实验中,发现多级孔NH2-MIL-53(Al)对盐酸四环素的吸附性能大幅提升,吸附行为符合拟二级动力学模型和Langmuir模型。结合内扩散分析及pH值对吸附性能的影响,推测出可能的吸附机理为外表面吸附由静电作用和π-π相互作用主导同时伴随着内扩散。多级孔NH2-MIL-53(Al)的吸附性能较其它传统吸附剂更为优异,在治理由抗生素导致的水污染中展现出巨大的应用潜力。
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王林冲
刘 民
郭新闻
关键词 NH2-MIL-53(Al)多级孔盐酸四环素吸附机理    
Abstract:The hierarchical pore NH2-MIL-53(Al) was successfully prepared by structural defect method and characterized by powder X-ray diffraction (XRD), nitrogen/argon physical adsorption, scanning electron microscope analysis (SEM), thermogravimetric analysis (TG), Fourier transform infrared spectroscopy (FT-IR). The results showed that NH2-MIL-53(Al) had a hierarchical pore structure composed of micropores and mesopores. To investigate the hypothesis that the lack of a metal source throughout the crystallization process caused flaws and created mesopores, experiments were carried out in which the ratios of citric acid and solvent were changed. In the adsorption experiment of tetracycline hydrochloride in aqueous solution, it was found that the adsorption performance of hierarchical pore NH2-MIL-53(Al) on tetracycline hydrochloride was greatly improved, and the adsorption behavior accorded with the pseudo-second-order kinetic model and Langmuir model. Combined with the internal diffusion analysis and the effect of pH on the adsorption performance, it was inferred that the possible adsorption mechanism was that the external surface adsorption was dominated by electrostatic interaction and π-π stacking with internal diffusion simultaneously. The adsorption performance of hierarchical pore NH2-MIL-53(Al) was better than that of other traditional adsorbents, which showed great potential in treating polluted water caused by antibiotics.
Key wordsNH2-MIL-53(Al)    hierarchical pore    tetracycline hydrochloride    adsorption mechanism   
收稿日期: 2023-04-08     
作者简介: 王林冲(1999—),男,硕士研究生;刘 民(1975—),男,副教授,通讯联系人。E-mail: lium@dlut.edu.cn。
引用本文:   
王林冲,刘 民,郭新闻. 多级孔NH2-MIL-53(Al)的制备及其吸附性能[J]. 化学反应工程与工艺, 2024, 40(2): 97-106.
WANG Linchong,LIU Min,GUO Xinwen. Preparation and Adsorption Properties of Hierarchical Pore NH2-MIL-53(Al)[J]. Chemical Reaction Engineering and Technology, 2024, 40(2): 97-106.
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