Environmental catalysis and materials

A new photon kinetic-measure based on the kinetics of electron-hole pairs in photodegradation of textile wastewater using the UV-H2O2FS-TiO2 process

SHIGWEDHA Nditange , HUA Zhao-zhe , CHEN Jian


Received March 23, 2006,Revised May 29, 2006, Accepted , Available online

Volume 19,2007,Pages 367-373

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Actual textile wastewater and synthesized wastewater containing various textile dyes were photocatalytic degraded by the UV-H2O2FS-TiO2 process in an annular-flow photocatalytic reactor. In this process, a photon kinetic-measure was adapted as a result of observing constant rates of dyes decomposition. It was theorized that, on illumination at different UV frequencies, the electrons within the semiconductor were excited from the valence band to the conduction band, yielding the formation of electron-hole pairs at the constant rate. CPT (critical photonic time) exposure required to cause 90% of vibrations between the double and single bonds along the molecular chain of the dyes to be oxidized, was taken and used as a measure of the photocatalytic activities. The CPTs varied according to the frequencies of the UV spectral areas. The derivatization of CPT from the first-order kinetic law is presented.

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