Decolorization kinetics of Procion H-exl dyes from textile dyeing using Fenton-like reactions

Photo-degradation of di azo dye Bismarck Brown by advanced photo-Fenton process: Influence of inorganic anions and evaluation of recycling efficiency of iron powder

“…The complete degradation takes place efficiently in the presence of UV light. This can be accounted to the photo-reduction process of aqueous Fe 3+ to Fe 2+ (rate determining step in the dark) takes place at a faster rate (Ntampegliotis et al, 2006):…”

“…For the treatment of wastewater containing dye, traditional methods such as flocculation, carbon adsorption, reverse osmosis and activated sludge processes have difficulties in the complete destruction of dye pollutants and has further disadvantage of generating secondary pollution. Photo-Fenton process based on the generation of hydroxyl radicals in situ is proved to be effective way for the removal of organic pollutants in wastewater treatment (Neamtu et al, 2003;Ntampegliotis et al, 2006;Zhao et al, 2004). However the removal of sludge containing iron ions at the end of wastewater treatment is expensive and requires large amount of chemicals and needs extra manpower.…”

Removal of Hg0 and simultaneous removal of Hg0/SO2/NO in flue gas using two Fenton-like reagents in a spray reactor

“…In addition, related results show that increasing Fe 3+ or Cu 2+ concentration will increase the yield of Å OH produced by Fentonlike reagents by the following reactions (3)-(8) [17][18][19][20][21][22]24,25].…”

“…The results [17][18][19][20][21][22] show that in Fenton-like reaction process, adding excess H 2 O 2 may result in the consumption of ÁOH, which can be described by the following reaction (15). The reaction (15) with a very high reaction rate (the rate constant is up to 2.7 Â 10 7 M À1 s À1 ) will inhibit removal of Hg 0 by the consumption of ÁOH and H 2 O 2 when the excess H 2 O 2 is added to the reaction system.…”

“…Fenton-like reagents can generate hydroxyl free radicals ( Å OH) with very strong oxidizing to remove organic pollutants in wastewater, and have received widespread attention because of having strong oxidizing, simple process and no secondary pollution [17][18][19][20][21][22]. In the field of flue gas purification, Lu et al [16] firstly used Fenton-like reagent (Fe 3+ /H 2 O 2 ) to remove Hg 0 from flue gas in a simple bubble reactor, and preliminarily studied the effects of several parameters such as solution pH, residence time, solution volume on removal of Hg 0 .…”