Solar photocatalytic thin film cascade reactor for treatment of benzoic acid containing wastewater

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)1125-1135
Journal / PublicationWater Research
Volume37
Issue number5
Publication statusPublished - Mar 2003
Externally publishedYes

Abstract

A solar photocatalytic cascade reactor was constructed to study the photocatalytic oxidation of benzoic acid in water under various experimental and weather conditions at HKUST. Nine stainless steel plates coated with TiO2 catalyst were arranged in a cascade configuration in the reactor. Photolytic degradation and adsorption were confirmed to be insignificant total organic carbon (TOC) removal mechanisms. A turbulent flow pattern and, hence, improved mixing in the liquid film were achieved due to the unique cascade design of the reactor. The photoinduced consumption of oxygen during reactions was demonstrated in a sample experiment. The proposed rate equations provided good fits to 90 data points from 17 experiments. The regression results showed that the TOC removal rates averaged over 30min intervals did not illustrate significant dependence on TOC0 and that Imean was more important in affecting the photocatalytic process within the ranges of the data examined. The percentage removal of TOC in 7l of 100mg/l (or 100ppm) benzoic acid solutions increased from 30% to 83% by adding 10ml of hydrogen peroxide solution (30wt%). Hydrogen peroxide was also shown to enhance the efficiency of the degradation process at elevated temperatures. Ortho-, meta- and para-hydroxybenzoic acids were identified by HPLC analysis as the intermediates of benzoic acid during reactions without the addition of hydrogen peroxide solutions. © 2002 Elsevier Science Ltd. All rights reserved.

Research Area(s)

  • Cascade, Peroxidation, Photocatalysis, Solar, Titanium dioxide (TiO2)

Citation Format(s)

Solar photocatalytic thin film cascade reactor for treatment of benzoic acid containing wastewater. / Chan, Alex H.C.; Chan, Chak K.; Barford, John P.; Porter, John F.

In: Water Research, Vol. 37, No. 5, 03.2003, p. 1125-1135.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal