Novel heterogeneous photocatalysts prepared with waste wool and Fe³⁺ or Cu²⁺ ions for degradation of CI Reactive Red 195: a comparative study

Abstract

In order to reuse waste wool, two transition metal ions, Fe 3+ and Cu 2+ , were coordinated to with it to prepare a series of metal-wool complexes as new heterogeneous Fenton photocatalysts for the degradation of a typical azo dye, CI Reactive Red 195, in aqueous solution. The effect of the initial metal ion concentration and temperature on the reaction was investigated. Furthermore, the catalytic performance of the resulting metalwool complexes was evaluated with respect to the dye decoloration efficiency at different pH levels under visible irradiation. The results demonstrated that increasing the initial metal ion concentration and temperature enhanced ion coordination to produce complexes of increased metal content. The obtained Fe-wool showed a higher metal content than the Cu-wool. The light adsorption performance in the UV and visible regions of Cu-Fe-wool is stronger than that of Fe-wool or Cu-wool. Furthermore, Cu-Fe-Wool was found to have a higher catalytic activity than the other two complexes under visible irradiation, especially in the alkaline pH range. Coloration Technology Society of Dyers and Colourists 200

Comparative study of four different flavonoid compounds‐containing plant extracts functionalised waste wool for accelerating aqueous chromium(VI) reductive removal

“…The band of the disulphide bond was found to be located between 1000 and 1200 cm −1 . 63,64 In addition to these peaks of wool fibre, several typical peaks including 1728, 1640 and 1033 cm −1 (stretching vibration of OH, CH, C=O and C=C) of flavonoids, especially anthocyanins 25 were clearly observed in the spectrum of fresh LRM-e-W. There was a characteristic adsorption band between 500 and 950 cm −1 , which was attributed to the vibration modes of benzene rings of anthocyanin.…”

The progress and prospect for sustainable development of waste wool resources

“…The complex can be used as catalyst for degradation CI reactive Red 19; The Cu-Fe-wool has higher catalytic activity under visible irradiation Cui et al [43][44][45] Heavy metals Wool Compared with the effectiveness of several low-cost adsorbents, wool was the most effective adsorbent for removing Cr(VI); a two-step mechanism for removal of Cr(VI) using wool.…”

Rapid decolorisation of dyeing wastewater by FeIII(2,2′:6′,2″‐terpyridine)activated peroxymonosulphate

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“…In recent years, various iron‐based catalysts have been developed for the degradation of dyes, phenols, drugs and pesticides 12 . The Fenton reaction is limited by pH, and needs to take place under acidic circumstances 13 . At the same time, iron sludge also needs to be cleaned 14 .…”