Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 457, Issue -, Pages 134-141Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2014.05.060
Keywords
Microwave-assisted synthesis; Temperature-programed hydrothermal treatment; Ag-ZnO-TiO2; Photocatalysis; Rhodamine B
Categories
Funding
- National Natural Science Foundation of China [21376126]
- Natural Science Foundation of Heilongjiang Province, China [B201106]
- Scientific Research of Heilongjiang Province Education Department, China [12511592]
- Government of Heilongjiang Province Postdoctoral Grants, China [LBH-Z11108]
- Open Project of Green Chemical Technology Key of Laboratory of Heilongjing Province College, China
- Postdoctoral Researchers in Heilongjiang Province of China Research Initiation Grant Project [LBH-Q13172]
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By the microwave-assisted synthesis, the nano-composite Ag/ZnO-TiO2 was prepared under cetyl trimethyl ammonium bromide (CTAB). The composition, structure and morphology were well-characterized by X-ray diffraction (XRD), diffuse reflectance (UV-vis/DRS), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and N-2 adsorption-desorption measurement. The results showed that the product AggnO-TiO2 synthesized by microwave-assisted contained part ZnTiO3 and Zn2TiO4 excepting ZnO wurtzite, and silver species existing in Ag/ZnO-TiO2 was metallic Ag-0. Compared with the Ag/ZnO-TiO2 synthesized by temperature-programed hydrothermal treatment, the product Ag/ZnO-TiO2 prepared by microwave-assisted method not only showed the improved morphology, and the BET specific surface area and pore volume were enlarged in varying degrees, but also had a stronger response in the visible area. Moreover, photocatalytic properties of the as-nanocomposites Ag/ZnO-TiO2 were tested by the different modes including ultraviolet, visible light, simulated sunlight and microwave-assisted irradiation photocatalytic degradation of Rhodamine B (RhB). The results showed that the photocatalytic activities of the product Ag/ZnO-TiO2 of microwave-assisted synthesis were much higher than that of P25, ZnO and other samples. In addition, the as-nanocomposite Ag/ZnO-TiO2 showed good degradation for different structure dyes including crystal violet, methylene blue and methyl orange under UV light irradiation. Furthermore, the product Ag/ZnO-TiO2 prepared by microwave-assisted method still has certain stability under ultraviolet light after three cycles experiment. According to the capture experimental results, we proposed the possible mechanism of the photodegradation about organic pollutants in the aqueous system. (C) 2014 Elsevier B.V. All rights reserved.
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