Kinetics of photocatalytic degradation of aniline in water over TiO_2 supported on porous nickel

摘要

The photocatalytic degradation of aniline was studied in annular photoreactor, with 2 * 6 W (E_(max) = 365 nm) UV lamp as light source, borosilicate glass as wave filter and titanium dioxide immobilized on porous nickel as catalysts. Parameters such as the initial concentration, flow rate, initial pH, dissolved oxygen, electrolyte, hydrogen peroxide addition, temperature and external potential bias affecting the degradation rate of aniline were studied. The results showed that photocatalysis is an effective process for the degradation of aniline. The activated energy for the photocatalytic degradation of aniline is 6.13 kJ mol~(-1). The initial quantum yield is 1.89% for aniline 1.10 * 10~(-4) mol l~(-1). Total mineralization requires a much longer illumination time than the disappearance of anilines. The external potential bias can largely improve the efficiency of photocatalytic degradation of aniline. The degradation kinetic of aniline can be described by Langmuir-Hinshelwood equation.