title: Effects of operational parameters on decolorisation of C.I. Reactive Black 5 in UV/TiO(2) system.
abstract: This study utilises a UV/TiO(2) system to decolorise C.I. Reactive Black 5 (RB5). The effects of TiO(2) dosage, pH, RB5 concentration and light power on the decolorisation efficiency using the UV/TiO(2) system were determined. IO(4)(-) was employed as an oxidant to increase the photodegradation efficiency of UV/TiO(2). The decolorisation rate constants (k) of RB5 in the UV/TiO(2) system are consistent with pseudo-first-order kinetics. The k values of 0.1, 0.5, 1.0 and 2.0 g/l TiO(2) were 0.53, 0.52, 0.69 and 0.68 h(-1), respectively. The rate constant increases with decreasing pH from 10 to 4. The decolorisation rate approximates linear relationship with RB5 concentration, as given by k=1.05[1/RB5](0.98); it varies nonlinearly with light power, as given by k=0.178[power](0.63). The experimental results reveal that the rate of decolorisation obtained using UV/TiO(2)/IO(4)(-) exceeds that obtained using UV/TiO(2).
authors.affiliation: Department of Chemical and Materials Engineering, National Kaohsiung University of Applied Sciences, 415 Chien Kung Road, Kaohsiung 807, Taiwan. chunghsinwu@yahoo.com.tw
authors.forename: C H
authors.initials: CH
authors.lastname: Wu
authors.forename: C Y
authors.initials: CY
authors.lastname: Kuo
authors.forename: P K A
authors.initials: PK
authors.lastname: Hong
mesh_terms: D004396:Coloring Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D009282:Naphthalenesulfonates / Q000737:chemistry*; D010504:Periodic Acid; D013997:Time Factors; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D004396:Coloring Agents; D009282:Naphthalenesulfonates; D014874:Water Pollutants, Chemical; D010504:Periodic Acid; C009495:titanium dioxide; C009288:metaperiodate; D014025:Titanium; C063421:Remazol black B