Photocatalytic degradation of an anionic dye in aqueous solution by visible light responsive zinc oxide-termite hill com
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Photocatalytic degradation of an anionic dye in aqueous solution by visible light responsive zinc oxide‑termite hill composite Adeyinka S. Yusuff1 · Kazeem A. Bello2 · Temitayo M. Azeez2 Received: 18 July 2020 / Accepted: 13 August 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract The present study investigated the photocatalytic potential of zinc oxide-termite hill composite (ZnO-TH) for anionic dye (acid blue 113, AB113) degradation in aqueous solution. The composite photocatalyst was prepared using the sol–gel method. The material properties were characterized using techniques such as gas sorption, scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and titration for the determination of the surface charge. The photocatalytic conditions effect on AB113 dye degradation efficiency was examined at a fixed irradiation time of 60 min. It was identified that the optimum values of the initial dye concentration, aqueous solution pH and photocatalyst loading were 25 mg/L, 3.0 and 1.2 g/L, respectively. At these optimum conditions, the maximum decolorization efficiency was found to be 92.21%. AB113 dye was almost completely mineralized after 60 min of visible light irradiation in the presence of the ZnO-TH composite. The photocatalyst showed good stability after being reused for five times. Keywords Photocatalysis · Acid blue 113 · Photodegradation · Kinetics · Mineralization
* Adeyinka S. Yusuff [email protected] 1
Laboratory of Chemical Reaction Engineering and Catalysis, Department of Chemical and Petroleum Engineering, College of Engineering, Afe Babalola University, Ado‑Ekiti, Nigeria
2
Laboratory of Material Science and Renewable Energy, Department of Mechanical and Mechatronic Engineering, College of Engineering, Afe Babalola University, Ado‑Ekiti, Nigeria
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Reaction Kinetics, Mechanisms and Catalysis
Introduction Textile industry wastewater is acquainted with a considerable amount of used dyes, surfactants and dissolved toxic heavy metals [1]. Indiscriminate release of this colored solution poses a threat to the environment. Conventional methods for treating textile effluents such as biological, adsorption, precipitation, coagulation-flocculation, sedimentation and membrane are not adequately effective in achieving complete separation of the contaminants from effluents. As a result, the treated solution from these processes could not meet the required discharge limits [2, 3]. Thus, various advanced oxidation processes (AOPs) have been developed aiming to achieve complete degradation of non-biodegradable contaminants of water and industrial effluents into harmless products (CO2 and H2O) [1]. One of the most promising AOPs for the destruction of recalcitrant water-soluble pollutants is heterogeneous photocatalysis via a combination of semiconductors and ultraviolet (UV) light [4]. In photocatalysis, UV light and semiconducting materials are often used to initiate the oxidation–reduction reaction that would gene
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