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TiO2/GO的制备及其室温可见光催化脱硝性能

王淑勤 李晓雪 武金锦

王淑勤, 李晓雪, 武金锦. TiO2/GO的制备及其室温可见光催化脱硝性能[J]. 燃料化学学报. doi: 10.1016/S1872-5813(22)60025-2
引用本文: 王淑勤, 李晓雪, 武金锦. TiO2/GO的制备及其室温可见光催化脱硝性能[J]. 燃料化学学报. doi: 10.1016/S1872-5813(22)60025-2
WANG Shu-qin, LI Xiao-xue, WU Jin-jin. Preparation of TiO2/graphene oxide and their photocatalytic properties at room temperature[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(22)60025-2
Citation: WANG Shu-qin, LI Xiao-xue, WU Jin-jin. Preparation of TiO2/graphene oxide and their photocatalytic properties at room temperature[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(22)60025-2

TiO2/GO的制备及其室温可见光催化脱硝性能

doi: 10.1016/S1872-5813(22)60025-2
基金项目: 国家重点研发计划(2018YFB060420103)和河北省自然科学基金(E2014502111 )资助
详细信息
    通讯作者:

    E-mail: wsqhg@163.com

  • 中图分类号: X511

Preparation of TiO2/graphene oxide and their photocatalytic properties at room temperature

Funds: The project was supported by the National Basic Research Program of China(2018YFB060420103) and National Natural Science Foundation of HeBei Province (E2014502111)
  • 摘要: 采用水热法制备出不同氧化石墨烯(GO)复合比例的TiO2/GO催化剂,并进行了SEM、TEM、XRD、UV-vis、XPS、FT-IR、拉曼光谱、光电流表征分析测试。结果显示,TiO2与TiO2/GO晶型都是锐钛矿型,GO在与钛酸丁酯水热反应制备TiO2/GO时部分被还原成还原氧化石墨烯(RGO),性质更接近于石墨烯,有利于光电子转移。复合材料TiO2/GO晶粒尺寸减小,吸附氧/晶格氧的比例增高,利于NO的氧化,禁带宽度缩小,吸收可见光能力更强,光电子响应能力得到提高。可见光下评价了对复合材料的光催化脱硝性能。GO的复合比例为1.5%时所得催化剂光催化脱硝性能最好。在氨氮比为1∶1时,脱硝效率为88.6%,与水热自制TiO2相比提高了30%,比商用V-Ti-W催化剂的效率提高了40%,且复合材料的抗干扰能力明显优于商用V-Ti-W催化剂。机理分析也表明,NO的氧化速率对光催化脱硝反应进程起到了关键作用,且氨气的存在可以加快对NO2的还原。
  • 图  1  TiO2/GO光催化脱硝反应流程示意图

    Figure  1  TiO2/GO photocatalytic denitration process.

    图  2  不同样品的TEM照片

    Figure  2  TEM images of different samples

    (a)、(b): TiO2/GO-0.5% (c)、(d): TiO2/GO-1.5%

    图  3  不同样品的X射线衍射谱图

    Figure  3  X-ray diffraction patterns of different samples.

    图  4  不同样品的XPS扫描谱图

    Figure  4  XPS scanning spectra of different samples

    (a) full spectrum (b) narrow range scanning spectrum of O element (c) narrow range scanning spectrum of Ti element (d) scanning spectrum of TiO2 and TiO2/GO-1.5%

    图  5  不同样品的拉曼光谱谱图

    Figure  5  Raman spectra of different samples

    图  6  催化剂的UV-vis DRS谱图

    Figure  6  UV-vis DRS spectrum of catalyst (a) UV-vis diffuse reflectance spectrum (b) photon energy spectrum

    图  7  不同样品的光电流谱图

    Figure  7  Photocurrent spectra of different samples

    图  8  催化剂的光催化脱硝

    Figure  8  Effect diagram of photocatalytic denitration of catalyst

    (a) Comparison of photocatalytic effect (b) Influence of molecular sieve and light source

    图  9  不同因素对光催化脱硝效果的影响

    Figure  9  Effects of different factors on photocatalytic denitration

    (a) Atmospheric humidity (b) SO2 concentration (c) Ammonia nitrogen ratio (d) Continuous use times

    图  10  催化剂的一级动力学拟合

    Figure  10  First order kinetic fitting diagram of catalyst

    图  11  光催化脱硝机理示意图

    Figure  11  Schematic diagram of photocatalytic denitration mechanism

    图  12  催化剂氧化速率对比

    Figure  12  Comparison chart of catalyst oxidation rate

    表  1  催化剂表征分析手段

    Table  1  Catalyst characterization and analysis methods

    CategoryManufacturer modelmain parameter
    TEM Tecnai G2 F20 S-TWIN Detection voltage:200 kV
    XRD Dandong Tongda Technology Co., Ltd; TD-3500 Scanning speed 10°/min range 10°–90°
    XPS Thermo Scientific Escalab 250X Radiation source: Al Ka =1361eV
    Roman HORIBA JY:LabRAM HR Evolution Excitation wavelength: 532 nm
    UV-vis Shimadzu:UV2450 Background: BaSO4
    Photocurrent Chi760e electrochemical workstation (Zhongjiao Jinyuan) Three electrode system
    下载: 导出CSV
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  • 收稿日期:  2022-02-28
  • 录用日期:  2022-04-27
  • 修回日期:  2022-03-31
  • 网络出版日期:  2022-05-05

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