Removal of disperse blue textile dye 56 from water using a metal-organic framework of erbium

Abstract

The disperse blue dye 56 (AD56) is of the anthraquinone type and is considered an important source of water pollution due to the discharges generated by the textile industry. An efficient way to eliminate it is using porous materials, for example, metal-organic networks (MOF). In this work, the adsorption of AD56 with an Er MOF was studied and synthesized by microwave-assisted method and using 1,4-benzene dicarboxylic acid (BDC) as an organic ligand. Physicochemical analysis of the Er2BDC3 was carried out by XRD, FTIR, SEM, and UV-Vis spectroscopy to determine the dye concentration. Due to its high porosity, the results show that the MOF can be reused for up to seven adsorption cycles for the AD56 dye. The adsorption process changed the structure of the MOF, obtaining a more pure and stable material in an aqueous medium. The maximum AD56 adsorption capacity obtained was 33.97 mg/g after seven cycles. This material can be used in consecutive adsorption processes and for other anthraquinone dyes.