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Application of UV LED/TiO2 Heterogeneous Photocatalysis for Removal of Methyl Orange Dye from Carbonate Contaminated Textile Wastewater
Authors: Smolný Marek | Trousil Vojtěch | Palarčík Jiří | Cakl Jiří
Year: 2017
Type of publication: ostatní - článek ve sborníku
Name of source: 5th European Conference on Environmental Applications of Advanced Oxidation Processes : book of abstracts
Publisher name: Vysoká škola chemicko-technologická v Praze
Place: Praha
Page from-to: 211
Titles:
Language Name Abstract Keywords
eng Application of UV LED/TiO2 Heterogeneous Photocatalysis for Removal of Methyl Orange Dye from Carbonate Contaminated Textile Wastewater Heterogeneous photocatalysis is one of the AOPs which has been widely investigated and used for degradation of the organic pollutants in textiles wastewaters. Thus the present contribution concerns the influence of some inorganic salts on (i) methyl orange adsorption on the catalyst surface and (ii) its photocatalytic degradation. The UVA-LED photocatalytic experiments were carried out in a batch mode dispersion type reactor with Degussa P-25 titanium dioxide as a photocatalyst. Various carbonates and bicarbonates (sodium, potassium and ammonium) were selected as additives at different concentrations and at different pH’s to determine the impact of their presence on the sorption as well as on the photocatalytic treatment. Decomposition of model dye molecules was monitored by means of spectrophotometry, total organic carbon analyses (TOC), chemical oxygen demand (COD), and zeta-potential measurements. The COD, TOC and spectrophotometric data provided a description of the thermodynamics and kinetics of the dye degradation process, while electrokinetic measurements allowed assessment of the nature of internal interactions. The results indicated significant dependence of both reaction rate and catalyst zeta potential on pH, dye concentration and addition of inorganic carbon compounds. The possible photocatalytic mechanisms were also discussed in terms of the radical production and sorption and charge induced effects. Heterogeneous Photocatalysis; UV LED; Titanium dioxide; Methyl Orange; Textile Wastewater

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