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Molecules 2017, 22(2), 337;

A Photocatalytic Rotating Disc Reactor with TiO2 Nanowire Arrays Deposited for Industrial Wastewater Treatment

Department of Mechanical Engineering, University of Hong Kong, Hong Kong, China
School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510000, China
Sinopec Fushun Research Institute of Petroleum and Petrochemicals (FRIPP), China Petroleum & Chemical Corporation, Fushun 113006, China
Authors to whom correspondence should be addressed.
Academic Editor: Michael K. H. Leung
Received: 12 December 2016 / Revised: 6 February 2017 / Accepted: 14 February 2017 / Published: 22 February 2017
(This article belongs to the Special Issue Solar Photocatalysis)
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A photocatalytic rotating disc reactor (PRD-reactor) with TiO2 nanowire arrays deposited on a thin Ti plate is fabricated and tested for industrial wastewater treatment. Results indicate that the PRD-reactor shows excellent decolorization capability when tested with methyl orange (>97.5%). Advanced oxidation processes (AOP), including photocatalytic oxidation and photolytic reaction, occurred during the processing. Efficiency of the AOP increases with reduction in light absorption pathlength, which enhanced the photocatalytic reaction, as well as by increasing oxygen exposure of the wastewater thin film due to the rotating disc design. It is found that, with a small dosage of hydrogen peroxide, the mineralization efficiency of industrial biodegraded wastewater can be enhanced, with a superior mineralization of >75% total organic carbon (TOC) removal. This is due to the fact that the TiO2 photocatalysis and hydrogen peroxide processes generate powerful oxidants (hydroxyl radicals) that can strongly improve photocatalytic oxidation efficiency. Application of this industrial wastewater treatment system is benefited from the TiO2 nanowire arrays, which can be fabricated by a mild solvothermal method at 80 °C and under atmospheric pressure. Similar morphologies and microstructures are found for the TiO2 nanowire arrays deposited on a large metal Ti disc, which makes the wastewater treatment process more practical and economical. View Full-Text
Keywords: TiO2 nanowire arrays; photocatalytic rotating reactor; wastewater treatment TiO2 nanowire arrays; photocatalytic rotating reactor; wastewater treatment

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Li, F.; Szeto, W.; Huang, H.; Li, J.; Leung, D.Y.C. A Photocatalytic Rotating Disc Reactor with TiO2 Nanowire Arrays Deposited for Industrial Wastewater Treatment. Molecules 2017, 22, 337.

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