Abstract
Magnetic Zr–based metal organic framework (UiO-66) @Polypyrrole (magnetic UiO-66@Ppy) was prepared to eliminate Cr(VI) from water. SEM and TEM results clearly revealed that the magnetic UiO-66@Ppy was a core-double-shell structure with the core of Fe3O4, inner shell UiO-66, and outer shell Ppy. The introduction of zirconium MOFs UiO-66 effectively prevented the agglomeration of polypyrrole and provided more available adsorption sites, the surface area increased from 9.57 m2/g (Ppy) to 10.57 m2/g (Fe3O4@Ppy) and 52.49 m2/g (magnetic UiO-66@Ppy). The magnetic UiO-66@Ppy possessed a high adsorption capacity of 259.1 mg/g in removing Cr(VI) from water. Adsorption kinetics followed the pseudo-second-order model. The removal of Cr(VI) involved the following mechanisms: (1) electrostatic attraction and ions exchange, the HCrO4− was adsorbed on the surface of magnetic UiO-66@Ppy by the protonated N(PpyN+) and Cl−; (2) reduction, Cr(VI) was reduced to Cr(III) by the reductive functional group(-NH-); (3) chelation, Cr(III) was immobilized on adsorbent by amine groups.
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Funding
The Guangzhou Science and Technology Project (grant number 201904010319) helped the collection of data, the Social Development Fund of Guangdong Province (grant number 2017A020216018) helped the analysis of data,Chongqing Science and Technology Commission of China (cstc2019jcyj-msxmX0647) and Science and Technology Research Program of Chongqing Municipal Education Commission China (KJQN201801324) and Foundation for High-level Talents of Chongqing University of Arts and Sciences (R2018CH11) helped the interpretation of the data.
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TTZ contributed to the conception of the study, performed the experiment, contributed significantly to analysis and manuscript preparation, and performed the data analyses and wrote the manuscript; QWL, XZ, HJL, and WC helped perform the analysis with constructive discussions. All authors read and approved the final manuscript.
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Zhou, T., Liang, Q., Zhou, X. et al. Enhanced removal of toxic hexavalent chromium from aqueous solution by magnetic Zr-MOF@polypyrrole: performance and mechanism. Environ Sci Pollut Res 28, 13084–13096 (2021). https://doi.org/10.1007/s11356-021-12341-x
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DOI: https://doi.org/10.1007/s11356-021-12341-x