Advanced oxidation of alkylphenol ethoxylates in aqueous systems

Fenton Oxidation Kinetics and Intermediates of Nonylphenol Ethoxylates

“…Moreover, these ferrous/ferric ions in the earlier redox reactions reacted with hydroxide ions and formed oxyhydroxide, which accounted for the coagulation capability of Fenton's reagent (Neyens and Baeyens, 2003). Unfortunately, those small flocs contributed very slightly to the removal of NPEOs (Westerhoff et al, 2005 ] = 3) was considered a proper dosage for the removal of NPEOs, in agreement with the studies of nonionic surfactant oxidation (Pagano et al, 2008;Nagarnaik and Boulanger, 2011). However, the optimal ratio determined in this study was lower than the ratio of 15 reported by Lucas and Peres (2009) for the removal of COD from olive mill wastewater.…”

“…Early works on NPEO degradation by Fenton oxidation showed typically limited effectiveness in its removal capacity in comparison with various advanced oxidation processes (Fuente et al, 2010;Nagarnaik and Boulanger, 2011) or with different surfactants (Kitis et al, 1999;Pagano et al, 2008). Effects of operation conditions on the removal of NPEOs by the Fenton oxidation process and their kinetics are still unknown, especially for the degradation intermediates.…”

Oxidative degradation of Triton X-45 using zero valent aluminum in the presence of hydrogen peroxide, persulfate and peroxymonosulfate

“…The elimination of APEO's by chemical, physical and biochemical (activated sludge) treatment systems is rather slow and inefficient [5,6]. Hence, alternative treatment processes such as ozonation and advanced oxidation processes (AOPs) have been investigated [7][8][9]. AOPs involve the production of highly reactive and hence non-selective free radicals such as the hydroxyl radical; HO • and sulfate radical; SO 4 • − , reacting with organic as well as inorganic contaminants almost indiscriminately [9][10][11][12][13][14].…”

Highly active iron-containing silicotungstate catalyst for heterogeneous Fenton oxidation of 4-chlorophenol

“…Advanced oxidation processes (AOPs) based on in-situ generation of highly reactive hydroxyl radicals are known for their capability to mineralize a wide range of organic pollutants [1][2][3]. Among the AOPs, Fenton process using the mixture of hydrogen peroxide (H 2 O 2 ) and ferrous iron (Fe 2+ ) for environmental remediation has been intensively studied for several decades [4][5][6][7][8].…”