Heterogeneous photo-Fenton oxidation of reactive azo dye solutions using iron exchanged zeolite as a catalyst

• Published in: Microporous and mesoporous materials 2008-11, Vol.115 (3), p.594-602
• Main Authors: Tekbaş, Mesut, Yatmaz, H. Cengiz, Bektaş, Nihal
• Format: Article
• Language: English
• Subjects: Advanced oxidation; Azo-dyes; Catalysis; Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Heterogeneous catalysis; Ion-exchange; Photo-Fenton; Photochemistry; Physical chemistry of induced reactions (with radiations, particles and ultrasonics); Porous materials; Surface physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Zeolite; Zeolites: preparations and properties
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2008.03.001

The heterogeneous photo-Fenton-type oxidation of reactive azo dye solutions has been investigated in a quartz batch reactor using artificial UVA as a light source. Fe-exchanged zeolite has been used as a heterogeneous catalyst in the process. The effect of various process variables on decolorization performance of the process was evaluated by examining temperature, pH, H 2O 2 dosage, catalyst loading, initial dye concentration and light intensity. The optimal operational parameters were found as follows: 35 °C, pH as solution pH 5.2, 15 mmol H 2O 2 dosage, 1 g/L catalyst loading. Stability and reuse of the catalyst were also tested. Mineralization and comparison with homogenous photo-Fenton process were evaluated by analyzing color removal and total organic carbon (TOC) values.