PMID: 15224756Jul 1, 2004Paper

Photoelectrocatalytic production of active chlorine on nanocrystalline titanium dioxide thin-film electrodes

Environmental Science & Technology
Maria Valnice B ZanoniMarc A Anderson

Abstract

The production of chlorine and hypochlorite is of great economical and technological interest due to their large-scale use in many kinds of commercial applications. Yet, the current processes are not without problems such as inevitable side reactions and the high cost of production. This work reports the photoelectrocatalytic oxidation of chloride ions to free chlorine as it has been investigated by using titanium dioxide (TiO2) and several metal-doped titanium dioxide (M-TiO2) material electrodes. An average concentration of 800 mg L(-1) of free chlorine was obtained in an open-air reactor using a TiO2 thin-film electrode biased at +1.0 V (SCE) and illuminated by UV light. The M-doped electrodes have performed poorly compared with the pure TiO2 counterpart. Test solutions containing 0.05 mol L(-1) NaCl pH 2.0-4.0 were found to be the best conditions for fast production of free chlorine. A complete investigation of all parameters that influence the global process of chlorine production by the photo electrocatalytic method such as applied potential, concentration of NaCl, pH solution, and time is presented in detail. In addition, photocurrent vs potential curves and the reaction order are also discussed.

References

Mar 1, 1994·Environmental Science & Technology·D H Kim, M A Anderson

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Citations

Jul 4, 2012·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Thomas BergerRoberto Gómez
Sep 20, 2016·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Olushola Sunday AyandaBhekumusa J Ximba
Jul 10, 2019·Environmental Science & Technology·Robert BrüninghoffGuido Mul

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