Highly enhanced photocatalytic reduction of Cr(VI) on AgI/TiO2 under visible light irradiation: Influence of calcination temperature

Journal of Hazardous Materials
Qi WangYanqing Cong

Abstract

AgI/TiO2 was prepared using a dissolution-precipitation method, followed by calcination at different temperatures (100-700°C). The as-prepared AgI/TiO2 powders were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis-DRS) and electrochemical impedance spectroscopy (EIS). The results revealed that calcination temperature significantly impacted the visible light absorption of AgI/TiO2 along with a shift from metastable γ-AgI to relatively stable β-AgI. We found that highest photocatalytic reduction rate of Cr(VI) and β-AgI content were obtained for a calcination temperature of 350°C. Furthermore, the pseudo-first order rate constant was five times that for a photocatalyst calcined at 100°C. The dramatically enhanced reduction rate of Cr(VI) was attributed to enhanced visible light absorption and greatly reduced charge transfer resistance, which eventually facilitates more efficient separation and easier transfer of photogenerated electron-hole pairs to the catalyst surface. Other experimental conditions were also carefully investigated and optimized with initial AgI loading percentage (5%), catalyst dosage (1.0g/L), coexisting organics (1.0...Continue Reading

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Citations

Jul 10, 2018·ChemSusChem·Maryline NasrMikhael Bechelany
Feb 21, 2018·Environmental Science and Pollution Research International·Pingping WangWei Zhang
Dec 15, 2019·Environmental Science and Pollution Research International·Kazem GodiniJae-Kyu Yang
Mar 7, 2021·Journal of Environmental Management·Sajjad NajaflouGholam Reza Nabi Bidhendi
Nov 28, 2021·Environmental Science and Pollution Research International·Eric Tobechukwu Anthony, Nurudeen Abiola Oladoja

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