Selective adsorption of aromatic acids by a nanocomposite based on magnetic carboxylic multi-walled carbon nanotubes and novel metal-organic frameworks
作者： Wen-kui Li , Hai-xia Zhang , Yan-ping Shi
DOI: 10.1016/J.APSUSC.2017.04.202
关键词: Selective adsorption 、 Nanocomposite 、 Zeolite 、 Carbon nanotube 、 Inorganic chemistry 、 Adsorption 、 Desorption 、 Imidazolate 、 Metal-organic framework 、 Chemistry
摘要: A novel magnetic adsorbent was designed and synthesized for adsorption determination of hazardous aromatic acids (AAs) based on the zeolite imidazolate frameworks Eu (ZIF-Eu), Fe3O4 carboxyl multi-walled carbon nanotubes (MWCNTs-COOH). ZIF-Eu fabricated first time, nanoparticles were encapsulated in MWCNTs-COOH, which made separation procedure simple easy-realizable. Adsorption experiments indicated that had superior affinity selectivity to adsorbates with multi-ring, multi-carboxylic electron-withdrawing group substituted structures, it can achieve selective AAs from mixture, mechanism evaluated attributed intermolecular π-π electron-donor-acceptor (EDA) hydrogen-bonding interactions. Seven different substituents selected as target investigate influences critical experimental conditions efficiencies. isotherms kinetics investigated Dubinin-Ashtakhov model pseudo-second-order could well describe nanocomposite. thermodynamics study suggested reactions spontaneous, endothermic thermodynamically favorable. In addition, desorption AAs, reusability evaluated, confirmed recyclability adsorbent.
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