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https://hdl.handle.net/2440/51535
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Type: | Journal article |
Title: | Optimisation of an annular photoreactor process for degradation of Congo Red using a newly synthesized titania impregnated kaolinite nano-photocatalyst |
Author: | Chong, M. Lei, S. Jin, B. Saint, C. Chow, C. |
Citation: | Separation and Purification Technology, 2009; 67(3):355-363 |
Publisher: | Elsevier Science BV |
Issue Date: | 2009 |
ISSN: | 1383-5866 1873-3794 |
Statement of Responsibility: | Meng Nan Chong, Shaomin Lei, Bo Jin, Chris Saint and Christopher W.K. Chow |
Abstract: | In this study, an annular photocatalytic reactor (APR) system was designed and operated to optimise the photocatalytic degradation of Congo Red (CR) using a newly synthesized titania impregnated kaolinite photocatalyst (TiO2/K). The design parameters of the APR: reactor configuration, mass transfer, mixing and hydrodynamics were discussed. The influences of the operation parameters: pH, critical TiO2/K loading, aeration rate and initial CR concentration on the photocatalytic performances were studied in a batch operation mode. Results showed that the initial pH was the most crucial operation parameter that significantly affected both the adsorption and photocatalytic reactions in the APR-TiO2/K system. The point of zero charge for TiO2/K was found to shift towards pH 9.5. The complete degradation of 40 ppm CR was attained in 4 h. Possible intermediates and by-products during the CR degradation were identified using the LC/MS technique. The TiO2/K reactivation study showed that the TiO2/K particles are highly stable and have a modest improvement in photoactivity for every recycle trial up to at least five cycles. The overall results revealed that the APR-TiO2/K system has promising application for the development of a technically feasible and cost-effective industrial water and wastewater treatment process. © 2009 Elsevier B.V. |
Keywords: | Photocatalysis TiO2 Congo Red Kaolinite Annular reactor Degradation |
DOI: | 10.1016/j.seppur.2009.04.001 |
Description (link): | http://www.elsevier.com/wps/find/journaldescription.cws_home/600251/description#description |
Published version: | http://dx.doi.org/10.1016/j.seppur.2009.04.001 |
Appears in Collections: | Aurora harvest 5 Chemical Engineering publications Environment Institute publications |
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