title: Photocatalytic degradation of p-chlorophenol by hybrid H₂O₂ and TiO₂ in aqueous suspensions under UV irradiation.
abstract: In this study, TiO2 particles were used as photocatalysts for the degradation of aqueous p-chlorophenol (p-CP) under UV irradiation. The effect of TiO2 dose (0-3 g/L), initial p-CP concentration, H2O2 concentration (2-45 mM), solution pH (4.6-9.5), and UV light intensity on the degradation of p-CP were examined. Four oxidative degradation processes, which utilized UV alone (direct photolysis), H2O2/UV, TiO2/UV, and H2O2/TiO2/UV, were compared in a batch photoreactor with a 100-W high-pressure mercury lamp. The photodegradation of p-CP could be described by the pseudo-first-order kinetics according to the Langmuir-Hinshelwood model. Moreover, the apparent degradation rate constants increased considerably from 3.5 × 10(-)(3) min(-)(1) (direct photolysis) to 19.9 × 10(-)(3) min(-)(1) (H2O2/TiO2/UV system).
authors.affiliation: Department of Chemical Engineering and Materials Science, Yuan Ze University, Chung-Li 32003, Taiwan.
authors.forename: Anh Thu
authors.initials: AT
authors.lastname: Nguyen
authors.affiliation: Department of Chemical and Materials Engineering, Chang Gung University, Kwei-Shan, Taoyuan 33302, Taiwan. Electronic address: rsjuang@mail.cgu.edu.tw.
authors.forename: Ruey-Shin
authors.initials: RS
authors.lastname: Juang
mesh_terms: D002384:Catalysis; D002733:Chlorophenols / Q000528:radiation effects*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010084:Oxidation-Reduction; D010782:Photolysis; D013535:Suspensions; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000528:radiation effects*; D018508:Water Purification / Q000379:methods*
chemical_list: D002733:Chlorophenols; D006861:Hydrogen Peroxide; D013535:Suspensions; D014025:Titanium; D062065:Wastewater; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; C029107:4-chlorophenol
keywords: Hydrogen peroxide; Langmuir–Hinshelwood model; Photocatalytic degradation; Titanium dioxide; UV light; p-Chlorophenol