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Review
. 2021 Mar;28(11):13084-13096.
doi: 10.1007/s11356-021-12341-x. Epub 2021 Jan 25.

Enhanced removal of toxic hexavalent chromium from aqueous solution by magnetic Zr-MOF@polypyrrole: performance and mechanism

Tingting Zhou  1   2 , Qianwei Liang  1   3 , Xin Zhou  1   2 , HanJin Luo  4   5   6 , Wei Chen  7
Affiliations
Review

Enhanced removal of toxic hexavalent chromium from aqueous solution by magnetic Zr-MOF@polypyrrole: performance and mechanism

Tingting Zhou et al. Environ Sci Pollut Res Int. 2021 Mar.

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.

Keywords: Adsorption; Cr(VI); Magnetic UiO-66; Mechanism; Ppy.

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