A new photon kinetic-measurement based on the kinetics of electron-hole pairs in photodegradation of

• 作 者: SHIGWEDHA Nditange HUA Zhao-zh
• 机 构: Laboratory of Environmental Biotechnology,School of Biotechnology,Southern Yangtze University,Wuxi 2
• 出 处: 环境科学学报（英文版）
• 发表日期: 2007年3期
• 关键词: critical photonic time(CPT) photon efficiency UV frequencies regression line tex

Actual textile wastewater and synthesized wastewater containing various textile dyes were photocatalytic degraded by the UVH2O2Fs-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 difierent UV frequencies.the electrons within the semiconductor were excited from the valence band to the conduction band,yielding the formation of electron-hole palrs 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.