title: [Effects and mechanisms of inorganic anions in water on degradation of LAS by UV/H2 O2 combination process].
abstract: Experiments are carried out to study the effects and mechanisms of inorganic anions in water on the degradation of linear alkyl benzene sulfonate (LAS) in UV/H2 O2 process. The results show that UV/H2 O2 process could remove LAS effectively, and the rate of photodegradation follows first-order reaction kinetics model. Under the condition that H2 O2 concentration was 8 mg x L(-1) and a 14 W low pressure mercury vapor discharge lamp irradiated samples, the first-order photodegradation rate constant of LAS in distilled water and tap water were 0.018 0 min(-1) and 0.012 2 min(-1) respectively. NO3-, Cl-, SO4(2-) and HCO3- have inhibitory action on LAS photodegradation. The higher inorganic anions concentration was, the stronger inhibitory action. When their concentrations were 5, 10 and 15 mmol x L(-1) respectively, their inhibitory action order was HCO3- > NO3- > Cl- > SO4(2-) all the time. It was anions synthetical effect that caused photodegradation rate constant of LAS in tap water lower than distilled water.
authors.affiliation: College of Chemistry and Life Science, Shenyang Normal University, Shenyang 110034, China. crystalpan78@126.com
authors.forename: Jing
authors.initials: J
authors.lastname: Pan
authors.forename: Tie-Heng
authors.initials: TH
authors.lastname: Sun
authors.forename: Hai-Bo
authors.initials: HB
authors.lastname: Li
mesh_terms: D017738:Alkanesulfonic Acids / Q000737:chemistry* / Q000302:isolation & purification; D000838:Anions / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry* / Q000494:pharmacology; D010777:Photochemistry; D010782:Photolysis / Q000187:drug effects / Q000528:radiation effects; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods*; D014881:Water Supply / Q000032:analysis
chemical_list: D017738:Alkanesulfonic Acids; D000838:Anions; D014874:Water Pollutants, Chemical; C030641:alkylbenzyl sulfonic acid; D006861:Hydrogen Peroxide