Renovation and Reuse of Reactive Dyeing Effluent by a Novel Heterogeneous Fenton System Based on Metal Modified PTFE Fibrous Catalyst/H₂O₂

Abstract

Cu-Fe bimetallic grafted polytetrafluoroethylene (PTFE) fiber complexes were prepared and optimized as the novel heterogeneous Fenton catalysts for the degradation of reactive dyes under UV irradiation. Cotton fabrics were dyed with three reactive dyes, namely, Reactive Red 195, Reactive Yellow 145, and Reactive Blue 222, in tap fresh water using exhaustion process. The spent dyeing effluents were then collected and degraded with the optimized Cu-Fe bimetallic grafted PTFE fiber complex/H 2 O 2 system. The treated dyeing effluents were characterized and reused for the dyeing of cotton fabrics through the same process. The effect of reuse process number on quality of the dyed cotton fabrics was examined. The results indicated that the Cu-Fe bimetallic modified PTFE fiber complex with a Cu/Fe molar ratio of 2.87 was found to be the most effective fibrous catalyst, which enhanced complete decolorization of the treated dyeing effluents with H 2 O 2 in 4 h. However, the TOC removal for the treated dyeing effluents was below 80%. The dyeing quality was not affected for three successive cycles. The increase in residual TOC value influences fourth dyeing cycle. Further TOC reduction of the treated effluents is needed for its repeated reuse in more than three dyeing cycles.

Heterogeneous Fenton catalysts for the abatement of organic pollutants from aqueous solution: a review

“…This efficiency depends more on the Cu/Fe molar ratio, which was found to be optimal at 2.87. Li et al 160 used grated Cu-Fe bimetallic PTFE ber complexes with a Cu/Fe molar ratio of 2.87 for the degradation of reactive red 195, reactive yellow 145, and reactive blue 222 under UV irradiation. Complete decolourization and a higher amount of mineralization were observed in the optimal operating conditions.…”

Isomorphous substitution of Cr by Fe in MIL-101 framework and its application as a novel heterogeneous photo-Fenton catalyst for reactive dye degradation

“…In recent years, the active heterogeneous Fenton catalysis is gradually replacing the homogeneous system by immobilized Fe ions on the polymer substrates. 31 Fe substituted MOFs used as heterogeneous photo-Fenton catalysts in degradation of reactive dyes have not yet been reported. Therefore, in this study we examine the Fenton and photo-Fenton catalytic activities of Fe-Cr-MIL-101 in degradation of reactive red dye 195 (RR195).…”

Immobilized fungal consortium‐GR: a novel textile effluent treatment alternative for removal of azo dyes and other pollutants

“…2,3 Some 2% of dyes consumed are released to water bodies in textile effluents (TE). 4,5 Owing to the amount of pollution caused by this industry, it is classified into Red category. Textile wastewater contains a variety of chemicals which are carcinogenic, including toxic heavy metals, biocides, pentachlorophenol, chlorine and amines.…”