Hydrothermal synthesis of Ag 2 MoO 4 with photocatalytic activity for rhodamine B degradation
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RESEARCH
Hydrothermal synthesis of Ag2MoO4 with photocatalytic activity for rhodamine B degradation Ahmat Gulpiya 1 & Zhi Su 1
&
Hui Pan 1
Received: 27 April 2017 / Revised: 26 November 2017 / Accepted: 12 January 2018 # Australian Ceramic Society 2020
Abstract The cubic Ag2MoO4 photocatalyst was prepared with a solvothermal method using ethanol as a solvent. The morphology and structure of the obtained materials were analyzed by using X-ray diffraction and transmission electron microscopy. The effect of different heat treatment conditions on the visible-light response of Ag2MoO4 was studied by UV-Vis spectroscopy. The obtained Ag2MoO4 materials were applied as photocatalysts for the degradation of rhodamine B (RhB), and the degradation process was analyzed by using Fourier transform infrared spectroscopy (FTIR). The material synthesized at 100 °C for 12 h exhibited the best photocatalytic activity, with degradation of RhB reaching 95.0% within 60 min. The RhB degradation process had a short halflife and an average activation energy of 32.7 kJ/mol. The results of the photocatalytic experiments were in good agreement with the material characterization results. Keywords Ag2MoO4 . Photocatalytic activity . Rhodamine B . Degradation
Introduction As environmental pollution continues to become an increasingly serious problem, there is a great demand for technologies and materials that can address environmental pollution issues [1, 2]. photocatalytic technology has attracted considerable attention in the fields of clean air and water purification research, as many organic pollutants and inorganic pollutants can be degraded under irradiation in the presence of an appropriate photocatalyst [3–5]. In recent years, various molybdate semiconductor materials, such as Bi 2 MoO 6 , PbMoO 4 , and CaMoO4, have been developed owing to their excellent structural characteristic and good catalytic activities in photocatalytic degradation studies [6–9]. Ag2MoO4 is a p-type semiconductor catalyst and various methods have been reported for the synthesis of Ag2MoO4 materials with different structures [10–13]. J.C et al. [14] reported a vibrating ball milling method to prepared stoichiometric Ag2MoO4 materials. Maria T Fabbro et al. [15] have obtained β-Ag2MoO4 microcrystals by using a surfactant in a co-precipitation method with ethanol * Zhi Su [email protected] 1
College of Chemistry and Chemical Engineering, Xinjiang Normal University, Urumqi, China
as the solvent. Li et al. [16] reported the use of PVP as a precursor in the synthesis of cube-like Ag-Ag2MoO4 materials using by via a facile microwave-assisted hydrothermal method. The preparation of sample by hydrothermal-solvothermal method is simple, the product was of high purity and good desperation, and the morphology and size of the sample are easy to control. Therefore, in this study, Ag2MoO4 materials were prepared by a solvothermal method using ethanol as a solvent at a constant temperature. The effect of varying the synthesis on the morphology and structure of the samples
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