Solar Light Induced Glass-Supported Zinc Oxide Catalyzed Degradation of Allura Red AC in Aqueous Solution
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HEMICAL KINETICS AND CATALYSIS
Solar Light Induced Glass-Supported Zinc Oxide Catalyzed Degradation of Allura Red AC in Aqueous Solution Tapan Kumar Sahaa,*, Subarna Karmakera, Sanjay Debnatha, and Md. Imran Ali Biswasa aDepartment
of Chemistry, Jahangirnagar University, Savar, Dhaka, 1342 Bangladesh * e-mail: [email protected]
Received January 20, 2020; revised January 20, 2020; accepted March 11, 2020
Abstract—The glass-supported zinc oxide (ZnO)-catalyzed photodegradation of Allura Red AC (AR) was studied in aqueous solution as function of solar light irradiation time, solution pH, amount of ZnO, initial dye concentration, some inorganic anions (SO24 − , CO32 − , Cl‒, NO3− ), and hydrogen peroxide. The maximum rate of AR degradation was observed in the acidic solution at pH 3. The degradation rate of AR increased with increased dosage of the ZnO, and decreased with increased initial concentration of the dye solution. The presence of NO3− ion increased the photodegradation rate while, SO24 − , CO32 − , and Cl‒ decreased the reaction rate. The addition of H2O2 showed a synergistic effect on dye degradation. However, mannitol and ethylenediaminetetraacetic acid (EDTA) significantly reduced the photodegradation of AR indicating hydroxyl radicals played a key role in dye degradation process. Hence, these results confirm that the glass-supported ZnOcatalyzed photodegradation can be used to clean dye-contaminated industrial wastewater. Keywords: azo dye, photocatalytic degradation, glass-supported ZnO, scavengers DOI: 10.1134/S0036024420130233
INTRODUCTION The survival, growth and sustenance of life including humans and other living organisms require water which is the most abundant compound on earth covering about 70% of the world’s premises. The principal sources of this vital asset are lakes, ponds, rivers, mineral ground water, sea, rain water etc [1–3]. The consumption and pollution of water has immensely increased in the last few decades due to the rapid raise of industrialization, populace, urbanization and acceleration of agricultural practice [4]. Dyes are one of the major water pollutants that enter into the water body from textile, paper, pharmaceutical, paints, food products, cosmetics and leather industries. Estimation shows that about 10000 colorants are industrially produced, of which around 7 × 105 tons are of synthetic type produced every year. In fact, as much as 200000 tons of these pigments and dyes are supplied into the influent waste stream per year at the time of production as well as dyeing operation and sometimes the amount comprises up to (10–50)% [5–10]. Synthetic azo dyes are complex aromatic compounds containing (–N=N–) groups and are designed to persist sunlight, oxidizing agents, soap, and difficult to degrade having large half-life [11–13]. As a result of the chemical stability and resistance to biodegradability, these complex organic compounds lead to environmental pollution. They are known to
give rise intense health hazard by molding up toxic and carcinogenic chemicals [14, 15].
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