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Wang J.,Nanjing University of Technology | Wang J.,Nanjing Beilida New Materials System Engineering Co. | Lu C.,Nanjing University of Technology | Xiong J.,Nanjing Beilida New Materials System Engineering Co.
Applied Surface Science | Year: 2014

Environmental pollution has an evidently adverse impact on the buildings that are constructed by the glass fiber reinforced cement (GRC) materials. In the present work, the stable, neutral TiO2/SiO2 hydrosols were prepared by using the Ti(SO4)2 as titanium source, HNO3 as peptizing agent, and SiO2 as stabilizer through a simple and low cost process. The morphologies and structures of TiO 2/SiO2 hydrosol were further characterized by the TEM, SEM, XRD, and FTIR measurement. In the synthetic hydrosol, lots of nanoparticles with the diameters in the range of 10-20 nm can be observed. TiOSi band were formed, as observed from the FTIR spectrum. The Na2O·SiO 2 was detected from the SEM. After drying the TiO2/ SiO2 hydrosol, the XRD shown that the TiO2 has an anatase structure and the SiO2 is amorphous. The TiO2/SiO 2 hydrosol can be compactly coated on the GRC surface due to the existence of Na2O·SiO2 binder and exhibited high photocatalytic activity and stability in the degradation of Rhodamine B. © 2014 Elsevier B.V.

Wang J.,Nanjing University of Technology | Wang J.,Nanjing Beilida New Materials System Engineering Co. | Wang M.,Nanjing Beilida New Materials System Engineering Co. | Xiong J.-R.,Nanjing Beilida New Materials System Engineering Co. | Lu C.-H.,Nanjing University of Technology
Xinxing Tan Cailiao/New Carbon Materials | Year: 2015

Two kinds of graphene prepared by a high-temperature exfoliation and a solvothermal method were used as supports of a TiO2 catalyst (P25) from Degussa, Inc to prepare TiO2/graphene composites. The photocatalytic activities of the composites were evaluated by their degradation of Rhodamine B in aqueous solutions under visible light. Results indicate that the composites prepared by high-temperature exfoliation have much higher photocatalytic activities than those produced by the solvothermal method or the unsupported P25. Both the adsorption capacity of Rhodamine B on the composites and their light absorption characteristics are independent of the kind of graphene used. The activity increases with exfoliation temperature and reduction degree of the graphene regardless of the methods and conditions used, indicating that a high degree of reduction of graphene can inhibit the recombination of electron-hole pairs generated by light irradiation by increasing electron transfer from TiO2 to the graphene layer. ©, 2015, Xinxing Tan Cailiao/New Carbon Materials. All right reserved.

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