Chemical Industry and Engineering Progress ›› 2021, Vol. 40 ›› Issue (3): 1517-1526.DOI: 10.16085/j.issn.1000-6613.2020-0805

• Materials science and technology • Previous Articles     Next Articles

Preparation and properties of graphite/TinO2n-1 composites

WU En’hui1,2(), LI Jun1,2, HOU Jing1,2, HUANG Ping1,2, XU Zhong1,2, JIANG Yan1,2, LUO Binyang1   

  1. 1.Panzhihua University, Panzhihua 617000, Sichuan, China
    2.Sichuan Engineering Laboratory for Solar Energy Utilization Technology Integrated, Panzhihua 617000, Sichuan, China
  • Received:2020-05-12 Online:2021-03-17 Published:2021-03-05
  • Contact: WU En’hui

石墨/TinO2n-1复合材料的制备及性能

吴恩辉1,2(), 李军1,2, 侯静1,2, 黄平1,2, 徐众1,2, 蒋燕1,2, 罗彬杨1   

  1. 1.攀枝花学院,四川 攀枝花 617000
    2.四川省太阳能利用技术集成工程实验室,四川 攀枝花 617000
  • 通讯作者: 吴恩辉
  • 作者简介:吴恩辉(1984—),男,博士,副教授,研究方向为钒钛磁铁矿综合利用及钒钛功能材料。E-mail:wuenhui1026@126.com
  • 基金资助:
    四川省科技计划(2019ZYD026);攀枝花市科技计划(2017CY-G-12);攀枝花大学科技园发展有限责任公司种子基金“双创”项目(2019-02);国家级大学生创新实验训练计划(201811360051)

Abstract:

Under atmospheric pressure, the graphite/TinO2n-1 composites were prepared by an carbothermal reduction process of anatase titanium dioxide powders using graphite reductant. The variation of valence state of titanium was investigated by X-ray diffractometer (XRD) in the carbothermal reduction process, and morphology, structure and element composition of the specific reduced sample was analyzed by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The XRD results indicated that the graphite/TinO2n-1 composites with different n value could be obtained with controlling different reduction conditions, and the order of phase transition was TiO2(anatase), TiO2(rutile), Ti9O17, Ti8O15, Ti6O11, Ti5O9 and Ti4O7. The minimum resistivity of the reduced samples was 0.1465Ω·cm, which was prepared at 1250℃ for 20min with the graphite/TiO2 mass ratio of 5∶10. The adsorption capacity of graphite/TinO2n-1 composites in methylene blue (MB) bleaching was enhanced in comparison with graphite powers, and the removal efficiency was 1.40~3.20 times of graphite. Under visible light irradiation, the graphite/TinO2n-1 composites were confirmed to have photocatalytic activity for the degradation of methylene blue (MB) though a little lower than that of anatase TiO2. The maximum apparent rate constant k of the graphite/TinO2n-1 composites was 0.0047min-1.

Key words: TinO2n-1, composites, reduction, preparation, adsorption, degradation

摘要:

在常压下,以钛白粉为原料,石墨为还原剂,采用碳热还原法制备了石墨/TinO2n-1复合材料。采用XRD系统分析了碳热还原过程中钛的价态变化规律;采用XPS、SEM、TEM分析了特定样品的形貌、结构和元素组成。XRD分析结果表明,控制不同的还原条件,可以得到不同n值的石墨/TinO2n-1复合材料,且还原过程的物相转变顺序为:TiO2(锐钛型)、TiO2(金红石型)、Ti9O17、Ti8O15、Ti6O11、Ti5O9和Ti4O7。在还原温度为1250℃,还原时间为20min,碳钛比为5∶10的条件下所制备的石墨/TinO2n-1复合材料的电阻率最低,其值为0.1465Ω·cm。吸附/光降解实验表明,石墨/TinO2n-1复合材料对亚甲基蓝的吸附能力比纯石墨显著增强,吸附去除率为纯石墨的1.40~3.20倍;石墨/TinO2n-1复合材料对亚甲基蓝具有光催化降解活性,但是其光降解能力低于锐钛型TiO2;复合材料的催化降解速率常数最大值为0.0047min-1

关键词: TinO2n-1, 复合材料, 还原, 制备, 吸附, 降解

CLC Number: 

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