Effects of exogenic chloride on oxidative degradation of chlorinated azo dye by UV-activated peroxodisulfate

Gallic Acid Accelerates the Oxidation Ability of the Peracetic Acid/Fe(III) System for Bisphenol A Removal: Fate of Various Radicals

“…As shown in Figure S5a, Cl – had a negligible impact on BPA degradation. Although •OH could react with Cl – to form ClOH – ( k = 4.3 ± 0.4 × 10 9 M –1 s –1 ), ClOH – dissociated back to •OH and Cl – with a k of 6.1 ± 0.8 × 10 9 M –1 s –1 . − Therefore, BPA could be further removed by regeneration radicals, resulting in little inhibition in the presence of Cl – . HA showed a slight inhibitory effect when its concentration was less than 10 mM.…”

Kinetic and mechanistic insights into the degradation of clofibric acid in saline wastewater by Co2+/PMS process: a modeling and theoretical study

“…Moreover, the same dual effect of Cl − was observed for 4-chloro-2-nitrophenol removal in saline wastewater by Co 2+ /PMS, 20 whereas an opposite dual effect (promoting then inhibitory) was obtained on chlorinated azo dye oxidation in the UV/PS system. 36 However, CA degradation efficiency gradually increased with added Cl − in the PMS/Cl − system (Fig. S3b † ).…”

“…44 Interestingly, chloride ions undergo oxidization by SO 4 ˙ − to produce chlorine radicals that form chlorinated aromatic by-products ( P2 and P3 ) by nucleophilic addition. Peng et al 36 also indicated chlorine atoms of chlorinated azo dyes might be partially released as inorganic ions, which undergo subsequent rechlorination. Alternatively, SO 4 ˙ − initially reacts with CA, which led to CA dechlorination, followed by oxidization of the intermediate by SO 4 ˙ − to generate chlorinated by-products ( P4 ).…”

Biochar/α‐Fe2O3/γ‐Fe2O3 Heterjunction Composite for Photocatalytic Removal of Amino Black

“…[1,2] The removal of azo dye from wastewater is a long-term task, which has attracted widespread attention from chemists. [3][4][5][6] Several approaches have aimed to remove toxic azo dye in wastewater, including absorption, [7,8] biodegradation, [9][10][11][12] and chemical degradation. [13][14] Beyond that, the photodegradation method using metal oxides is useful for degrading organic dye into environmentally friendly products, [15] including TiO 2 , [16] ZnO, [17] CdS, [18] SnO, [19] Fe 2 O 3 [20] etc.…”