Degradation of Orange G by UV/TiO2/IO4 ‾process: Effect of operational parameters and estimation of electrical energy consumption

Indian Journal of Chemical Technology

article

Hayet Chamekh¹  Fatiha Ahmedchekkat¹  Nour El Houda Souames¹ 

[1] Laboratory of Anticorrosion-Materials, Environment and Structure ,(LAMES-E1061500), Chemical Engineering Department, Faculty of Technology, University of 20 Août 1955-Skikda;Laboratoire de Recherche sur la Physico-Chimie des Surfaces et Interfaces ,(LRPCSI), University of 20 Août 1955-Skikda

关键词: Energy consumption;    Hybrid advanced oxidation process;    Hydroxyl radicals;    Iodate radicals;    Orange G;    Periodate;    Article;   

DOI  :  10.56042/ijct.v30i3.62814

学科分类：化学（综合）

来源: National Institute of Science Communication and Information Resources

【 摘 要 】

In the present study, the degradation of an azo dye Orange G (OG) by the UV/TiO2/periodate (IO4‾) process has been investigated. OG was totally disappears within 10 min by the UV/TiO2/IO4‾compared to UV alone, UV/TiO2 or UV/IO4‾. A synergistic effect has been obtained when combining the UV/TiO2 and the UV/IO4‾systems, resulting in positive interactions between both processes. Experiments conducted with specific hydroxyl radical scavengers, show that despite the inhibition effect observed, complete degradation has been achieved beyond 10 min, demonstrating that the degradation is not only initiated by hydroxyl radical, but also by other reactive entities; the involvement of iodate radical is confirmed with the use of chromium species as a competitor with periodate ions for the photogenerated electron at the conduction band. The operating parameters influencing the degradation process such as initial dye concentration, initial periodate concentration, light intensity/wavelength and initial pH solution have been explored. The presence of inorganic ions such as chloride, bromide, sulphate, carbonate and bicarbonate ions in the irradiated solution show reverse effects depending on the concentration used. The OG degradation in different water matrices is found to be sensitive to the presence of different species and their nature. Chemical oxygen demand (COD) has been partially removed after 10 min of treatment, and then this COD abatement stabilized, indicating the strength of the by-products from dye degradation by the UV/TiO2/IO4‾ system during the treatment time. The electrical energy consumption is estimated at 2.21kWhm‾3/Order. The results obtained indicate that the UV/TiO2/IO4‾ process could be used as a hybrid process to the treatment of dye contaminated water.

【 授权许可】

CC BY-NC-ND