Abstract
Heterostructure Ag/AgCl/Bi2MoO6 nanocomposites as visible-light-driven photocatalyst for rhodamine B (RhB) degradation were prepared by precipitation and sonochemical-assisted deposition method. The phase, morphology, oxidation state of element and optical properties of heterostructure Ag/AgCl/Bi2MoO6 nanocomposites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and UV-visible spectroscopy. In this research, the pure sample prepared by simple hydrothermal method was orthorhombic phase of Bi2MoO6 nanoplates with smooth surfaces. Upon being loaded with Ag/AgCl by sonochemical-assisted deposition method, AgCl and Ag nanoparticles were deposited on the surface of Bi2MoO6 nanoplates. The UV-visible spectra of Ag/AgCl/Bi2MoO6 nanocomposites show visible light absorption higher than pure Bi2MoO6 nanoplates. The enhanced photocatalytic efficiency of Ag/AgCl/Bi2MoO6 nanocomposites was investigated through rhodamine B (RhB) degradation under visible light irradiation and compared with those of the Bi2MoO6 nanoplates and AgCl/Bi2MoO6 nanocomposites. The photocatalytic efficiency of heterostructure Ag/AgCl/Bi2MoO6 nanocomposites in degrading RhB under visible light irradiation is higher than those of Bi2MoO6 nanoplates and AgCl/Bi2MoO6 nanocomposites. The photocatalytic efficiency of Ag/AgCl/Bi2MoO6 nanocomposites in degrading RhB is 99.70% under visible light irradiation within 30 min.
Highlights
Contamination of organic pollutants in water released from textile, medicine, plastic and other industries is one of the most serious problems for environmental sustainable development and human health [1-5]
The X-ray diffraction (XRD) pattern of the pure Bi2MoO6 sample synthesized by simple hydrothermal method represents the sharp diffraction peaks at 2θ = 10.92o, 28.27o, 32.20o, 32.62o, 33.13o, 36.03o, 46.21o, 46.71o, 47.20o, 55.58o, 56.23o and 58.48o
The XRD pattern of heterostructure AgCl/Bi2MoO6 nanocomposites shows new diffraction peaks at 2θ = 27.83o, 32.23o and 46.27o which can be indexed to (111), (200) and (220) planes of cubic AgCl phase which is in accordance with those of the JCPDS No 31-1238 [23], indicating the formation of AgCl and Bi2MoO6 with a good crystallinity
Summary
Contamination of organic pollutants in water released from textile, medicine, plastic and other industries is one of the most serious problems for environmental sustainable development and human health [1-5]. The material has been widely used in many potential applications such as gas sensing, ion-conductive, luminescent, dielectric and catalytic application [2, 11, 12] It is an excellent photocatalyst for degradation of organic pollutants and water splitting under visible light irradiation [2, 11-13]. Ag/AgCl coupled with semiconductor photocatalyst such as Ag/AgCl/WO3 [17], Ag/AgCl/ZnTiO3 [18], Ag/AgCl/Bi2Zr2O7 [19] and Ag/AgCl/ZnCo2O4 [20] shows enhanced photocatalytic activity for dye degradation under visible light irradiation due to an integration of the synergetic effect of suitable size plasmonic Ag/AgCl and strong coupling effect between Ag@AgCl and semiconductor photocatalyst [13, 16, 18, 20, 21]. Active radicals of the process were investigated in this research
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