Enhanced Photo–Fenton Removal Efficiency with Core-Shell Magnetic Resin Catalyst for Textile Dyeing Wastewater Treatment

Abstract

Heterogeneous photo–Fenton reactions have been regarded as important technologies for the treatment of textile dyeing wastewaters. In this work, an efficient core-shell magnetic anion exchange resin (MAER) was prepared through in situ polymerization and used to remove reactive brilliant red (X-3B) in a UV–Fenton system. The MAER exhibited satisfactory removal efficiency for X-3B because of its highly effective catalytic activity. More than 99% of the X-3B (50 mg/L) was removed within 20 min in the UV–Fenton reaction. This is because the uniformly dispersed core-shell magnetic microsphere resin could suppress the aggregation of Fe3O4 nanoparticles and, thus, enhance the exposure of Fe reaction sites for catalytic reaction with H2O2. The good adsorption capacity of MAER also played an important role in promoting contact between X-3B and reactive radicals during the reaction. Mechanism research showed that hydroxyl radical (•OH) was the main reactive radicals for the removal of X-3B in the MAER UV–Fenton system. The MAER can be easily separated by a magnet after catalytic reactions. Moreover, the matrix effects of different substrates (Cl−, NO3−, SO42−, and humic acid) were investigated. The results showed that SO42− could be beneficial to improve the removal of X-3B but that the others decrease the removal. The MAER UV–Fenton also removed significant amounts of total organic carbon (TOC) for the X-3B solution and an actual textile dyeing industrial wastewater. The heterogeneous oxidation system established in this work may suggest prospects for practical applications in the treatment of textile dyeing wastewater.

An Optimization Study of Advanced Fenton Oxidation Methods (UV/Fenton–MW/Fenton) for Treatment of Real Epoxy Paint Wastewater

“…When the color removal efficiencies were examined, a removal rate between 75 and 95% was observed. This finding coincides with the data in other scientific reports [54,55].…”

Recent Strategies for the Remediation of Textile Dyes from Wastewater: A Systematic Review

“…The two major approaches for the degradation of dyes present in textile water are Fenton and photo-Fenton [65,66]. These processes are carried out by using a Fenton reagent, namely H 2 O 2 , and a soluble iron (II) salt mixture [67][68][69].…”

The Beneficial Role of Nano-Sized Fe3o4 Entrapped in Ultra-Stable Y Zeolite for the Complete Mineralization of Phenol by Heterogeneous Photo-Fenton Under Solar Light

“…However, their strong aggregation in neutral or acidic solutions, as the main drawback, must be prevented (Minella et al, 2014). As a result, different types of Fe 3 O 4 -based systems have been studied, often in elaborate catalytic formulations (Zhong et al, 2021;Gong et al, 2019).…”

“…Finally, the materials obtained according to the impregnation procedure were subjected to thermal treatment under a reducing atmosphere at different temperatures, to obtain a different Fe 3 O 4 content and study its role as a catalyst in the photo-Fenton oxidation of phenol under solar light. The formation of iron-containing magnetic phases provides an additional advantage to the catalyst, as it allows its easy separation from the reaction medium and contributes to the realization of an efficient process (Zhong et al, 2021;Gong et al, 2019). The catalysts were fully characterized from the structural, compositional, textural and magnetic points of view.…”