PMID- 16047800
OWN - NLM
STAT- MEDLINE
DCOM- 20060206
LR  - 20190715
IS  - 0013-936X (Print)
IS  - 0013-936X (Linking)
VI  - 39
IP  - 12
DP  - 2005 Jun 15
TI  - Development of an E-H2O2/TiO2 photoelectrocatalytic oxidation system for water 
      and wastewater treatment.
PG  - 4614-20
AB  - In this study, an innovative E-H2O2/TiO2 (E-H2O2 = electrogenerated hydrogen 
      peroxide) photoelectrocatalytic (PEC) oxidation system was successfully developed 
      for water and wastewater treatment. A TiO2/Ti mesh electrode was applied in this 
      photoreactor as the anode to conduct PEC oxidation, and a reticulated vitreous 
      carbon (RVC) electrode was used as the cathode to electrogenerate hydrogen 
      peroxide simultaneously. The TiO2/Ti mesh electrode was prepared with a modified 
      anodic oxidation process in a quadrielectrolyte (H2SO4-H3PO4-H2O2-HF) solution. 
      The crystal structure, surface morphology, and film thickness of the TiO2/Ti mesh 
      electrode were characterized by X-ray diffraction and scanning electron 
      microscopy. The analytical results showed that a honeycomb-type anatase film with 
      a thickness of 5 microm was formed. Photocatalytic oxidation (PC) and PEC 
      oxidation of 2,4,6-trichlorophenol (TCP) in an aqueous solution were performed 
      under various experimental conditions. Experimental results showed that the 
      TiO2/Ti electrode, anodized in the H2SO4-H3PO4-H2O2-HF solution, had higher 
      photocatalytic activity than the TiO2/Ti electrode anodized in the H2SO4 
      solution. It was found that the maximum applied potential would be around 2.5 V, 
      corresponding to an optimum applied current density of 50 microA cm(-2) under 
      UV-A illumination. The experiments confirmed that the E-H2O2 on the RVC electrode 
      can significantly enhance the PEC oxidation of TCP in aqueous solution. The rate 
      of TCP degradation in such an E-H2O2-assisted TiO2 PEC reaction was 5.0 times 
      that of the TiO2 PC reaction and 2.3 times that of the TiO2 PEC reaction. The 
      variation of pH during the E-H2O2-assisted TiO2 PEC reaction, affected by 
      individual reactions, was also investigated. It was found that pH was well 
      maintained during the TCP degradation in such an E-H2O2/TiO2 reaction system. 
      This is beneficial to TCP degradation in an aqueous solution.
FAU - Li, X Z
AU  - Li XZ
AD  - Department of Civil and Structural Engineering, The Hong Kong Polytechnic 
      University, Hung Hom, Kowloon, Hong Kong, China. cexzli@polyu.edu.hk
FAU - Liu, H S
AU  - Liu HS
LA  - eng
PT  - Comparative Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Environ Sci Technol
JT  - Environmental science & technology
JID - 0213155
RN  - 0 (Chlorophenols)
RN  - 15FIX9V2JP (titanium dioxide)
RN  - BBX060AN9V (Hydrogen Peroxide)
RN  - D1JT611TNE (Titanium)
RN  - MHS8C5BAUZ (2,4,6-trichlorophenol)
SB  - IM
MH  - Catalysis
MH  - Chlorophenols/*chemistry
MH  - Chromatography, High Pressure Liquid
MH  - Electrochemistry/*methods
MH  - Hydrogen Peroxide/*chemistry
MH  - Hydrogen-Ion Concentration
MH  - Kinetics
MH  - Microscopy, Electron, Scanning
MH  - Oxidation-Reduction
MH  - Titanium/*chemistry
MH  - Waste Disposal, Fluid/*methods
MH  - Water Purification/*methods
MH  - X-Ray Diffraction
EDAT- 2005/07/29 09:00
MHDA- 2006/02/07 09:00
CRDT- 2005/07/29 09:00
PHST- 2005/07/29 09:00 [pubmed]
PHST- 2006/02/07 09:00 [medline]
PHST- 2005/07/29 09:00 [entrez]
AID - 10.1021/es048276k [doi]
PST - ppublish
SO  - Environ Sci Technol. 2005 Jun 15;39(12):4614-20. doi: 10.1021/es048276k.