Visible light assisted Fenton oxidation of tartrazine using metal doped bismuth oxyhalides as novel photocatalysts. (15th December 2018)

• Record Type: Journal Article
• Authors: Tekin, Gülen; Ersöz, Gülin; Atalay, Süheyda
• Is Part Of: Journal of environmental management. Volume 228(2018)
• Page Start: 441
• Page End: 450
• Publication Date: 2018-12-15
• Subjects: Advanced oxidation -- Bismuth oxyhalide -- Food dye -- Green catalyst -- Photocatalysis -- Visible light; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2018.08.099
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: This research focused on the abatement of the model food dye, tartrazine, using visible light photo-Fenton oxidation with novel bismuth oxyhalide catalysts. Bismuth-oxyhalide and metal doped bismuth oxyhalide catalysts (BiOCl, Cu-BiOCl, and Fe-BiOCl) were synthesized via the facile co-precipitation method. The catalysts were characterized by SEM-EDX, XRD, BET, and DRS analyses and the results showed that Cu-BiOCl possess a unique flower-like nanostructure with narrow band gap (2.53 eV) which enhanced its visible light photocatalytic activity remarkably which was proven by catalyst screening experiments. A detailed experimental study was carried out to investigate the effects of operating parameters on the degradation and decolorization of the dye and from this the optimum values were determined as 0.25 g/L for photocatalyst loading, 100 W for visible light power, 6 for initial pH, 6 mM for initial H2 O2 concentration, and temperature of 70 °C. Approximately 91% degradation, 95% decolorization, and 59% TOC reduction were obtained at optimum conditions. The results for the kinetic study showed that the degradation and decolorization reactions are in the pseudo-first order and obey the simplified Langmuir-Hinselwood kinetic model. The activation energies were calculated as 86.54 and 69.39 kJ/mol for degradation and decolorization, respectively. Highlights: Green chemistry-based method for food dye abatement was employed. Facile synthesis for efficient, reusable visible light photocatalysts. Unique flower-like nanospherical photocatalyst was synthesized. High degradation and decolorization obtained up to 90–95% at mild conditions. A non-complex reaction kinetic model was fitted.