Photo-degradation of sugar processing wastewater by copper doped bismuth oxyiodide: Assessment of treatment performance and kinetic studies. (15th September 2022)

• Record Type: Journal Article
• Authors: Tekin, Gülen; Ersöz, Gülin; Atalay, Süheyda
• Is Part Of: Journal of environmental management. Volume 318(2022)
• Publication Date: 2022-09-15
• Subjects: Advanced oxidation processes -- Bismuth oxyiodide -- Kinetic modelling -- Photo-Fenton oxidation -- Sugar industry wastewater; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2022.115432
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: In this study, photo-Fenton-like oxidation method was evaluated for synthetic sugar industry wastewater using visible-light driven Cu–BiOI photocatalyst. Reaction conditions including initial pH, catalyst loading, initial hydrogen peroxide (H2 O2 ) concentration, and temperature, were optimized. At these optimized conditions, the total saccharide concentration (TSC) and total organic carbon (TOC) removals were 56.20% and 30.67%, respectively whereas the maximum TSC and TOC removal reached up to 93.35% and 74.72% respectively by decreasing initial sucrose concentration. The kinetic study showed that the reaction order for sucrose and TOC oxidation was determined as 2 for pseudo-homogeneous power law models with respect to sucrose concentration and TOC, respectively.For heterogeneous models, Langmuir-Hinshelwood model based on the mechanism of adsorbed pollutant and oxidant on different catalytic sites was the best fit for oxidation of sucrose and other organic intermediates. According to the catalyst characterization studies, incorporation of copper was successful and Cu–BiOI possesses high photocatalytic activity accomplished by acid-assisted synthesis method. Highlights: A greener process was applied for treatment of sugar industry wastewater. Highest TSC and TOC removals reached 93.35% and 74.72%, respectively. Catalytic activity of Cu–BiOI was attributed to its unique micro-flower structure. Oxidation reactions were represented by homogeneous and heterogeneous models.