Format

Send to

Choose Destination
Chemosphere. 2017 Oct;185:574-581. doi: 10.1016/j.chemosphere.2017.07.071. Epub 2017 Jul 14.

Photoelectrocatalytic degradation of methylene blue using F doped TiO2 photoelectrode under visible light irradiation.

Author information

1
Engineering Research Center for Nanophotonics & Advanced Instrument, Ministry of Education, School of Physics and Materials Science, East China Normal University, Shanghai, 200062, China.
2
Engineering Research Center for Nanophotonics & Advanced Instrument, Ministry of Education, School of Physics and Materials Science, East China Normal University, Shanghai, 200062, China. Electronic address: enie@phy.ecnu.edu.cn.
3
Engineering Research Center for Nanophotonics & Advanced Instrument, Ministry of Education, School of Physics and Materials Science, East China Normal University, Shanghai, 200062, China; Shanghai Industrial Technology Institute, Shanghai, 201206, China.

Abstract

Photoelectrocatalysis (PEC) has attracted great interest due to cost effectiveness and high efficiency in water treatment. In this study, F doped TiO2 (F-TiO2) photoelectrodes with honeycomb like morphology were prepared, and the PEC performance was investigated. F-TiO2 particles that showed enhanced absorption of visible light were synthesized via a sol-gel method. F-TiO2 particles were anchored onto the surface of F-doped SnO2 glass by a screen-printing method to prepare the F-TiO2 photoelectrodes. The PEC performance of the F-TiO2 photoelectrodes was investigated via the degradation of methylene blue (MB) under visible light irradiation. The results show that the F-TiO2 photoelectrodes exhibited an excellent PEC performance that was affected by the F doping content, applied bias and solution pH. A maximum decolorization percentage of 97.8% was achieved by the FT-15 photoelectrode, with a 1.4 V bias at pH 9.94 after 4.0 h of visible light irradiation. The high PEC performance of the F-TiO2 photoelectrodes is mainly ascribed to the efficient separation of electron-hole (e--h+) pairs and the creation of active radicals such as hydroxyl radicals (OH). The PEC decolorization kinetic data were analyzed using the first-order kinetic model and the Langmuir-Hinshelwood (L-H) model. The data indicates that the PEC degradation of MB molecules mainly occurred on the surface of the F-TiO2 photoelectrodes, and the MB molecules were discolored mainly by h+ (41.5%) and OH (46.5%). In addition, 8.2% of the MB molecules were discolored by other oxidative species, and 3.8% of the MB molecules were discolored by self-sensitized oxidation.

KEYWORDS:

Degradation mechanism; F doped TiO(2); Methylene blue; Photoelectrocatalysis

[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center