Review on the Removal of Dyes by Photodegradation Using Metal-Organic Frameworks Under Light Irradiation

Abstract

Metal–organic frameworks are coordination network/polymer with organic ligands containing potential voids. MOFs are a class of porous polymeric material, consisting of metal ions linked together by organic bridging ligands. Different Metal-organic framework compounds of Zn, Fe, Al, Cr, Co, and Cd have been successfully synthesized using different synthesis method   under ambient conditions by   different scholars. The photocatalytic activity of these MOFs was investigated by the degradation of different organic dyes (such as: MO, MB, DTBP, Orange G., RhB, RBB, and phenol) in aqueous solution under light irradiation. These MOFs exhibits a promising photocatalytic activity for efficient dye degradation under UV –visible light depending on their band gap differences. The effect of electron acceptors (H₂O_2, KBrO₃ and (NH₄)₂S₂O₈) addition on the photocatalytic performance of MIL-53(Fe) on MB dye was also evaluated. The photocatalytic performance of this MOF was enhanced by the presence of electron scavengers by prolonging the hole-electron recombination. As a photocatalyst, the most remarkable feature of MOFs is the observation of reverse shape selectivity in which large molecules that cannot access the interior of the micropores are degraded significantly faster than those others that can enter into the pores.

Keywords: Metal organic frameworks, photodegradation, photocatalysts, dyes, electron scavengers, and reverse   shape/size selectivity.

DOI: 10.7176/CMR/12-1-03

Publication date: January 31^st 2020