Kinetics of photocatalytic degradation of aniline in water over TiO2 supported on porous nickel

The photocatalytic degradation of aniline was studied in annular photoreact or, with 2x6W (E-max,,= 365 nm) W lamp as light source, borosilicate glass as wave filter and titanium dioxide immobilized on porous nickel as catalys ts. Parameters such as the initial concentration, flow rate, initial pH, di ssolved oxygen, electrolyte, hydrogen peroxide addition, temperature and ex ternal potential bias affecting the degradation rate of aniline were studie d. The results showed that photocatalysis is an effective process for the d egradation of ani line. The activated energy for the photocatalytic degrada tion of aniline is 6.13 kJ mol(-1). The initial quantum yield is 1.89% for aniline 1.10 x 10(-4) mol l(-1). Total mineralization requires a much longe r illumination time than the disappearance of anilines. The external potent ial bias can largely improve the efficiency of photocatalytic degradation o f aniline. The degradation kinetic of aniline can be described by Langmuir- Hinshelwood equation. (C) 2000 Elsevier Science S.A. All rights reserved.