Effect of doping parameters on photocatalytic degradation of methylene blue using Ag doped ZnO nanocatalyst
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Effect of doping parameters on photocatalytic degradation of methylene blue using Ag doped ZnO nanocatalyst Sunil G. Shelar1,2 · Vilas K. Mahajan2 · Sandip P. Patil3 · Gunvant H. Sonawane2 Received: 19 February 2020 / Accepted: 30 March 2020 © Springer Nature Switzerland AG 2020
Abstract The aim of this study is the synthesis, characterization and photocatalytic degradation of ZnO and Ag doped ZnO nanocatalysts of various compositions synthesized by using co-precipitation method. The nanocatalysts were annealed at the 723.15 K temperature. The obtained nanocatalysts were characterized in concerns their crystalline structure using X-ray diffraction, morphology using scanning electron microscopy (SEM) and electron dispersive X-ray spectroscopy (EDS) in concern with their composition. Photocatalytic activity of nanocatalyst was tested by applying it for photocatalytic degradation of Methylene Blue under different experimental conditions. The photocatalytic activity found to increase with the increase of dopant concentration. Keywords Hexagonal ZnO · Photocatalytic activity · Methylene blue
1 Introduction Dyes play an important role in waste water effluents because they are discharged in large quantity from various manufacturing industries. They create severe environmental problems due to the presence of organic and inorganic chemicals in it. It creates the attention of many research workers due to the presence of potentially carcinogenic pollutants in contaminated water. Various approaches have been implemented to decontaminate these effluents [1]. Semiconductor photocatalysis is one of the most important photocatalytic processes has a great potential to the contribution of environmental problems. The important aspect of photocatalysis is selection of semiconductor material such as ZnO as an efficient photocatalyst because of its inexpensiveness, chemical stability, nontoxicity, higher efficiency and provides photo- generated holes with high oxidizing power due to their wide band
gap energy for the degradation of wide range of organic chemicals and synthetic dyes [2–4]. Photocatalysis is a promising technique for solving many current environmental issues [5, 6]. Semiconductor adsorbents offer the potential for elimination of organic pollutants [7]. TiO2 and ZnO are by far the most widely studied transition oxide semiconductors for photochemical and photoelectrochemical applications [8, 9]. Thus they become a sort of common model for research. It is a relatively abundant and stable material, with a more relatively good deal of resistance to photocorrosion than that of other commonly studied oxides. For photocatalysis, ZnO has also been considered as a suitable alternative for TiO2 due to the band-gap energy of ZnO is similar to that of TiO2, the most used and typical photocatalytic material, so it hypothetically has the same photocatalytic ability as ZnO and it exhibits better performance in the degradation of organic dye molecule in both acidic and basic media [10].
* Gunvant H. Sonawane, drgunvantsonawane@gm
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