Advanced Oxidation Processes for Organic Contaminant Destruction Based on the Fenton Reaction and Related Chemistry

Enhancement of Fenton oxidation for removing organic matter from hypersaline solution by accelerating ferric system with hydroxylamine hydrochloride and benzoquinone

“…As the pH increases, the ferric ions undergo extensive hydrolysis, transforming into amorphous ferric oxyhydroxides (Pignatello et al, 2006). The first two steps in Reaction (11) are slow, and the precipitated species cannot be readily redissolved (Pignatello et al, 2006). Moreover, the precipitated species was much less reactive than the ions (Neyens and Baeyens, 2003;Pignatello et al, 2006).…”

“…The process depends on the in situ production of hydroxyl radicals, which can effectively destroy and mineralize many organic contaminants in water (Kwon et al, 1999;Tang and Huang, 1996). Generally, the efficiency of an advanced process is related to the amount of hydroxyl radicals (OH U ) produced during the treatment (Pignatello et al, 2006). OH U production is mainly dependent on ferric system reactions (Reactions (2) and (3)), which constitute the rate-limiting step in the whole Fenton process (Neyens and Baeyens, 2003;Pignatello et al, 2006).…”

“…Generally, the efficiency of an advanced process is related to the amount of hydroxyl radicals (OH U ) produced during the treatment (Pignatello et al, 2006). OH U production is mainly dependent on ferric system reactions (Reactions (2) and (3)), which constitute the rate-limiting step in the whole Fenton process (Neyens and Baeyens, 2003;Pignatello et al, 2006). The Fenton (Reaction (1)) and Fenton-like reactions for U OH generation are strongly dependent on water pH.…”

“…The Fenton (Reaction (1)) and Fenton-like reactions for U OH generation are strongly dependent on water pH. Oxidative degradation of organic contaminants by Fenton reactions usually gives optimal results at a pH of approximately 3 (Lu et al, 2005;Pignatello et al, 2006). The Fe 3 + catalyst begins to precipitate above pH 3 in the form of relatively inactive hydrous oxyhydroxides, while ferric system reactions are inhibited at a pH level of less than 3 (Grebel et al, 2010;Zhang et al, 2014).…”

Study of the degradation performance (TOC, BOD, and toxicity) of bisphenol A by the photo-Fenton process

“…Advanced oxidation processes (AOPs), especially the photo-Fenton process, can be applied to remove BPA from water resources or industrial wastewater. AOPs can be used before or after conventional treatment plants in order to eliminate CECs and even to reach total mineralization when ideal conditions are provided (Pignatello et al 2006 ;Oller et al 2011 ;Rizzo 2011 ;Pérez-Moya et al 2014 ).…”