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Effect of Chemical Treatment on TiO 2 Particles by IMPS
Author(s) -
Yin Feng,
Lin Yuan,
Lin RuiFeng,
Li XuePing,
Xiao XuRui
Publication year - 2002
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20020201011
Subject(s) - photocurrent , chemistry , photodegradation , photocatalysis , cathodic protection , anode , photoelectrochemistry , reaction rate constant , reaction mechanism , analytical chemistry (journal) , photochemistry , inorganic chemistry , electrode , kinetics , electrochemistry , catalysis , environmental chemistry , materials science , organic chemistry , optoelectronics , physics , quantum mechanics
The photodegradation reaction rate of CHCl 3 , in TiO 2 particulate suspension was improved significantly by HCl‐treatment. The effect of HCl‐treatment on the photocatalytic activity of TiO 2 was studied in a PEC cell by using Intensity‐Modulated Photocurrent Spectroscopy (IMPS). The magnitude of photocurrent response and the characteristic frequencies of the upper and lower semicircles in the complex plane of IMPS response were analyzed, and the cathodic and anodic reaction processes of photogenerated holes and electrons were discussed. The increases in the cathodic and anodic photocurrent response and in the time constants of both cathodic and anodic reaction processes indicate that HCl‐treatment leads to the improvement of the photocatalytic activity of TiO 2 and a change of the photocatalytic kinetic mechanism.