title: Photooxidation of benzene-structured compounds: influence of substituent type on degradation kinetic and sum water parameters.
abstract: The combined influence of substituent type and UV/H(2)O(2) process parameters on the degradation of four aromatic water pollutants was investigated using modified 3(3) full factorial design and response surface methodology. Degradation kinetics was described by the quadratic polynomial model. According to the applied ANOVA, besides pH and [H(2)O(2)], model terms related with the pollutant structure are found to be significant. Different optimal operating conditions and values of observed degradation rate constants were determined for each of the pollutants indicating that the type of substituent influences the overall process effectiveness over structurally defined degradation pathway. Biodegradability (BOD(5)/COD) and toxicity (TU) were evaluated prior to the treatment and at the reference time intervals t(1/2)(P), t(3/4)(P), t(1/4)(OC) and t(1/2)(OC) corresponding to the real time required to reduce the concentration of parent pollutant and organic content for 1/2, 3/4, 1/4 and 1/2 of initial amount. The observed differences are correlated to the structural differences of studied aromatics.
authors.affiliation: Faculty of Chemical Engineering and Technology, University of Zagreb, Marulicev trg 19, Zagreb 10000, Croatia.
authors.forename: Daria
authors.initials: D
authors.lastname: Juretic
authors.forename: Hrvoje
authors.initials: H
authors.lastname: Kusic
authors.forename: Natalija
authors.initials: N
authors.lastname: Koprivanac
authors.forename: Ana
authors.initials: A
authors.lastname: Loncaric Bozic
mesh_terms: D000704:Analysis of Variance; D001554:Benzene / Q000737:chemistry*; D007700:Kinetics; D008962:Models, Theoretical; D010084:Oxidation-Reduction; D055668:Photochemical Processes; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D014874:Water Pollutants, Chemical; D014867:Water; D001554:Benzene