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        Efficient adsorptive elimination of organic pollutants from aqueous solutions on ZIF-8/MWCNTs-COOH nanoadsorbents: Adsorption kinetics, isotherms, and thermodynamic study

        Xinling Zhang,Ning Yuan,Shuo Xu,Yi Li,Qibao Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-

        The removal of organic pollutants was examined by new zeolitic imidazolate framework-8/carboxyl-functionalized multi-walled carbon nanotubes (ZIF-8/MWCNTs-COOH) nanoadsorbents, which were preparedvia controlling the reaction sequence of MWCNTs-COOH with the precursors of ZIF-8. Structuralmorphology and chemical composition characterizations confirmed the successful preparation of ZIF-8/MWCNTs-COOH nanoadsorbents. The obtained samples manifested a preferable adsorption capacityfor Congo red with the maximum adsorption capacity of 1185.58 mg g1 with an adsorption removal rateof 97.93% at equilibrium adsorption. Further analyses indicated that the adsorption process conformed tothe pseudo-second-order kinetic model and Langmuir adsorption isotherm. The thermodynamic analyseswere depicted as endothermic, entropy-increasing, and spontaneous. The effects of pH value, interferingions, and dosage on the adsorption properties were systematically explored. The nanoadsorbent can beexpediently reused for eight cycles without a prominent reduction in adsorption activity. The improvedperformance and high reusability can be ascribed to the increasing specific surface, the presence of electrostaticinteraction, hydrogen bonding, and p–p interaction between ZIF-8/MWCNTs-COOH and organicmolecules. In addition, the prepared composites also showed a better adsorption performance for tetracyclinewith the equilibrium adsorption capacity of 471.22 mg g1 compared to pure ZIF-8 and MWCNTs-COOH.

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