Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (6): 1015-1024.doi: 10.3866/PKU.WHXB201504143

• THERMODYNAMICS, KINETICS, AND STRUCTURAL CHEMISTRY • Previous Articles     Next Articles

Grafting Dynamics, Structures and Properties of Nano TiO2-SA Photocatalytic Materials

ZHANG Qiao-Ling1, LI Lei1, LIU You-Zhi1, WEI Bing1, GUO Jia-Xin1, FENG Yu-Jie2   

  1. 1 Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, North University of China, Taiyuan 030051, P. R. China;
    2 State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, P. R. China
  • Received:2015-01-26 Revised:2015-04-10 Published:2015-06-05
  • Contact: ZHANG Qiao-Ling E-mail:2654428235@qq.com.cn
  • Supported by:

    The project was supported by the Natural Science Foundation of Shanxi Province, China (2012011008-2) and Open Project of State Key Laboratory of UrbanWater Resource and Environment, Harbin Institute of Technology, China (QA201401).

Abstract:

Salicylic acid (SA) was successfully grafted onto nano-TiO2 surfaces (TiO2-SA) by post-treatment surface modification. The effects of ultrasound stiring, solvents, material ratio, pH value, and temperature on the grafting process and photocatalytic material properties were investigated, and the grafting reaction kinetics was determined. The structures of the materials were determined using Fourier transform infrared (FT- IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). A structural model was proposed. The properties of the photocatalytic material were examined using contact angle analysis, simultaneous thermogravimetry-differential scanning calorimetry (TG-DSC), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), and scanning electron microscopy (SEM). Compared with bare TiO2, the modified TiO2 had good hydrophobicity and dispersion properties, a lower sedimentation velocity in solvents, better adsorption stability at oil-water interfaces, and extended visible light absorption. The TiO2-SA gave excellent photocatalytic performances in nitrobenzene degradation under ultraviolet-light irradiation.

Key words: Titanium dioxide, Salicylic acid, Dispersion, Structure model, Pickering emulsion

MSC2000: 

  • O643