Rapid degradation of p -arsanilic acid with simultaneous arsenic removal from aqueous solution using Fenton process

Efficient conversion of dimethylarsinate into arsenic and its simultaneous adsorption removal over FeCx/N-doped carbon fiber composite in an electro-Fenton process

“…Only recently, the Fenton process (Fe 2þ /H 2 O 2 ) alone or assisted by plasma has started to be used to treat organoarsenic compounds (p-arsanilic acid and roxarsone) by fast oxidation of organoarsenic and efficient immobilization of inorganic arsenic at the same time (Hu et al, 2015b;Xie et al, 2016). Although the target arsenic species could be removed with high efficiency (oxidation and then adsorption by iron precipitate), Fe (III) directly added into the reaction solution is hard to recover and may cause secondary pollution (by arsenate-bearing ferric oxyhydroxides).…”

Photooxidation of p-Arsanilic Acid in Aqueous Solution by UV/Persulfate Process

“…Previous works [15] reported the cleavage of As-C bond during photolysis, generating aniline at circumneutral conditions, which could be sequentially oxidized to nitrobenzene [21,32,33]. The generation of benzenediol sulfate could result from sulfonation of dihydrobenzene formed both by direct p-ASA photolysis [13,14] or its oxidation of by SO 4 • − . Ring-open products-for example, aldehydes and carboxylic acids-with low molecular weight have been reported as the intermediates in AOPs treatment of aromatic compounds [28,32,34].…”

“…Photochemical degradation plays an important role in transformation of arsenic compounds in aqueous systems and efficient decomposition of p-ASA via UV irradiation has been previously reported [13][14][15][16][17]. However, rapid degradation of p-ASA during UV irradiation treatment is accompanied with a weak decrease of total organic carbon (TOC) [13][14][15], an indicator of the severity of organic pollution [18], suggesting a negligible mineralization and the accumulation of aromatic by-products [13,19] with questionable toxicity. Improved photochemical treatments are therefore needed for the p-ASA containing agriculture effluents.…”

Application of Sono–photo-Fenton process for degradation of phenol derivatives in petrochemical wastewater using full factorial design of experiment

“…Also, the auto decomposition of H 2 O 2 to water and oxygen and the reaction of H 2 O 2 with hydroxyl radicals instead of pollutant molecules were happened [23,24]. The optimum amount of H 2 O 2 offered by Model was 500 mg/L for the removal of COD.…”