Enhancement of 4-Chlorophenol Photodegradation with KrCl Excimer UV Lamp by Adding Hydrogen Peroxide

Development of a kinetic model for the UV/H2O2 photodegradation of 2,4-dichlorophenoxiacetic acid

“…The maximum emission of the lamp is at 222 nm. proportionality constant between irradiated mass and energy intensity per mass unit (min) k L a volumetric coefficient for the 2,4-D mass transfer rate (min À1 ) k r apparent first order kinetic constant for the overall photodegradation process of 2,4-D (min À1 ) k 01 first order kinetic constant for the formation of 4CP from 2,4-D (min À1 ) k 02 first order kinetic constant for the formation of 2CP from 2,4-D (min À1 ) k 03 first order kinetic constant for the formation of 2,4-DCP from 2,4-D (min À1 ) k 1 first order kinetic constant for the consumption of 4CP to give HQ (min À1 ) k 2 first order kinetic constant for the consumption of 2CP to give BQ (min À1 ) k 3 first order kinetic constant for the consumption of 2,4-DCP to give P (min À1 ) k 12 first order kinetic constant for the consumption of HQ to give P (min À1 ) k 22 first order kinetic constant for the consumption of BQ to give P (min À1 ) r dif mass transfer rate of 2,4-D (mg L À1 min À1 ) r 24D disappearance rate of 2,4-D (mg L À1 min À1 ) e quantum yield (mg L À1 min À1 W À1 )…”

“…It has been described [17] that they are especially effective to treat organic pollutants, because their emission bands match the dissociation energies of the main organic compounds bonds. They have been employed to remove phenolic compounds and dyes with different kind of lamps (KrCl, XeBr and Cl 2 ) and reactors (batch and flow-through reactors) [18][19][20][21][22][23][24][25][26][27], obtaining the best results with the KrCl excilamp in the flow-through reactor.…”

Degradation and detoxification of industrially important phenol derivatives in water by direct UV-C photolysis and H2O2/UV-C process: A comparative study

“…It has been already demonstrated that dechlorinated and hydroxylated oxidation products including phenol, catechol and hydroquinone and quinones, particularly benzoquinone are being generated during H 2 O 2 /UV-C oxidation of CPs [28], whereas for APEs, a very diverse range of oxidation products from polyethylene glycols [29] to polyethoxylated phenol, tertiary alcohols and APEs with relatively short ethoxy chain [26] have been identified. On the other hand, one can anticipate that simple-structured aliphatic carboxylic acids and aldehydes can be formed as the common degradation products of CPs and APEs by UV-C photolysis and AOPs.…”

Photodegradation of 2-methyl-4-chlorophenol in a KrCl exciplex flow-through photoreactor: a kinetic study

“…These kinds of lamps have been applied for the 4-chlorophenol oxidation [10,12,16] and recently the effect of UV radiation of discontinuous KrCl and XeBr photodegradation of 4-chlorophenol-2-methylphenoxyacetic acid was studied [17].…”

“…Recently, new UV sources called excimer lamps or excilamps have been developed and efficiently used alone [9][10][11] or in combination with hydrogen peroxide [12,13].…”