PROFESSOR K.Y. CHAN
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Electrochemical Generation of Green Oxidants
Oxidation processes are used for disinfection and environmental remediation.
Hydroxyl radicals, ozone, and hydrogen peroxide are amongst the most powerful oxidants. They are also environmentally benign compared to chlorine oxidants which can generate harmful residues. Due to their high reactivity, hydroxyl radicals and ozone can only be generated in-situ.
An attractive concept of in-situ simultaneous synthesis of ozone and hydrogen peroxide in an electrochemical reactor is proposed in this project. The combined use of ozone with hydrogen peroxide, subsequently generating hydroxyl radicals is especially effective for treating pollutants that are resistant to conventional methods.
The proposed development of materials and electrochemical configurations can lead to powerful environmental technology for treating drinking water, waste water and pollutants in a wide range of applications.
[1] Y. Cui, Y. Wang, B. Wang, H. Zhou, K. Y. Chan, and X. Y. Li, “Electrochemical Generation of Ozone in a Membrane Electrode Assembly Cell with Convective Flow”, J. Electrochem. Soc , 156 (2009) E75-E80.
[2] H. Wang, K. Y. Chan*, X. Y. Li*, and S. K. So, “Electrochemical degradation of 4-chlorophenol at nickel-antimony doped tin oxide electrode”, Chemosphere, 65 (2006) 1087.
[3] Y. H. Wang, K. Y. Chan*, and S. A. Cheng, “Synthesis of ozone from air via a polymer-electrolyte-membrane cell with a doped tin oxide anode”, Green Chemistry, 8 (2006) 568.
[4] Y. H. Wang, S. A. Cheng, K. Y. Chan*, and X. Y. Li, “Electrolytic Generation of Ozone on Antimony and Nickel doped Tin Oxide Electrode”, J. Electrochem. Soc., 152(11) (2005) D197.
[5] S. A. Cheng, K. Y. Chan, and W. K. Fung, “Device for and Method of Generating Ozone”, US Patent Application 2004/0226829 A1, published Nov. 18, 2004.
[6] S. A. Cheng and K. Y. Chan, “Electrolytic generation of ozone on an antimony doped tin dioxide coated electrode”, Electrochem. Solid State Letts., 7(3) (2004) D4-D6.
[7] S. A. Cheng, W. K. Fung, K. Y. Chan, and P. K. Shen, “Optimizing Electron Spin Resonance Detection of Hydroxyl Radical in Water”, Chemosphere, 52 (2003) 1797