A new photon kinetic-measurement based on the kinetics of electron-hole pairs in photodegradation of textile wastewater using the UV-H2O2FS-TiO2 process.
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 adopted to obtain constant rates of dyes decomposition. It was theorized that, by 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 which are the pre-requisites for photocatalysis. 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 to measure the photocatalytic activities. The CPTs varied with the frequencies of the UV spectral areas. The derivatization of CPT from the first-order kinetic law was presented.
Shigwedha
Nditange
N
Laboratory of Environmental Biotechnology, School of Biotechnology, Southern Yangtze University, Wuxi 214036, China.
Hua
Zhao-Zhe
ZZ
Chen
Jian
J
D004396:Coloring Agents / Q000737:chemistry*; D004583:Electrons; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007220:Industrial Waste; D007700:Kinetics; D008956:Models, Chemical; D016877:Oxidants / Q000737:chemistry; D017785:Photons; D013783:Textile Industry; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*
D004396:Coloring Agents; D007220:Industrial Waste; D016877:Oxidants; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D006861:Hydrogen Peroxide; D014025:Titanium