物理化学学报 >> 2015, Vol. 31 >> Issue (6): 1015-1024.doi: 10.3866/PKU.WHXB201504143

热力学,动力学和结构化学 上一篇    下一篇

TiO2-SA纳米光催化材料接枝动力学、结构及性能

张巧玲1, 李磊1, 刘有智1, 魏冰1, 郭加欣1, 冯玉杰2   

  1. 1 中北大学超重力化工过程山西省重点实验室, 太原030051;
    2 哈尔滨工业大学城市水资源与水环境国家重点实验室, 哈尔滨150090
  • 收稿日期:2015-01-26 修回日期:2015-04-10 发布日期:2015-06-05
  • 通讯作者: 张巧玲 E-mail:2654428235@qq.com.cn
  • 基金资助:

    山西省自然科学基金(2012011008-2)和哈尔滨工业大学城市水资源与水环境国家重点实验室开放基金(QA201401)资助项目

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).

摘要:

采用后处理表面改性法在纳米TiO2表面接枝水杨酸(SA)(TiO2-SA), 分别考察了超声搅拌、溶剂、物料比、pH值及温度等因素对接枝过程及光催化材料性能的影响, 并研究了接枝反应动力学. 通过傅里叶变换红外(FT-IR)光谱、X射线光电子能谱(XPS)、X射线衍射(XRD)等对TiO2-SA纳米光催化材料进行了结构表征, 并提出了结构模型. 通过接触角测定、同步热分析(热重-差示扫描量热法(TG-DSC))、紫外-可见漫反射光谱(UV-VisDRS)、扫描电子显微镜(SEM)对光催化材料进行了性能表征. 结果表明, 水杨酸改性纳米TiO2可以提高疏水性及分散性, 减缓在溶剂中的沉降速度, 并能稳定吸附在油-水界面, 实现了光谱响应范围向可见光的拓展. 在紫外光照射下, TiO2-SA表现出优异的光催化降解硝基苯性能.

关键词: 二氧化钛, 水杨酸, 分散性, 结构模型, Pickering 乳液

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