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ZIF-8/g-C3N4复合材料光催化深度氧化NO性能的研究

尹晓荷 庞吉胜 娄晨思 史雨翰 朱鹏飞 王传义

尹晓荷, 庞吉胜, 娄晨思, 史雨翰, 朱鹏飞, 王传义. ZIF-8/g-C3N4复合材料光催化深度氧化NO性能的研究[J]. 燃料化学学报. doi: 10.19906/j.cnki.JFCT.2022046
引用本文: 尹晓荷, 庞吉胜, 娄晨思, 史雨翰, 朱鹏飞, 王传义. ZIF-8/g-C3N4复合材料光催化深度氧化NO性能的研究[J]. 燃料化学学报. doi: 10.19906/j.cnki.JFCT.2022046
YIN Xiao-he, PANG Ji-sheng, LOU Chen-si, SHI Yu-han, ZHU Peng-fei, WANG Chuan-yi. Photocatalytic performance of ZIF-8/g-C3N4 composite for deep oxidation of NO[J]. Journal of Fuel Chemistry and Technology. doi: 10.19906/j.cnki.JFCT.2022046
Citation: YIN Xiao-he, PANG Ji-sheng, LOU Chen-si, SHI Yu-han, ZHU Peng-fei, WANG Chuan-yi. Photocatalytic performance of ZIF-8/g-C3N4 composite for deep oxidation of NO[J]. Journal of Fuel Chemistry and Technology. doi: 10.19906/j.cnki.JFCT.2022046

ZIF-8/g-C3N4复合材料光催化深度氧化NO性能的研究

doi: 10.19906/j.cnki.JFCT.2022046
基金项目: 国家自然科学基金(22006097)和陕西省重点研发计划(2022SF–250)项目资助
详细信息
    通讯作者:

    Tel:18392586563, E-mail: zhupengfei@sust.edu.cn

  • 中图分类号: TQ034

Photocatalytic performance of ZIF-8/g-C3N4 composite for deep oxidation of NO

Funds: The project was supported by National Natural Science Foundation of China (22006097) and the Key Research and Program of Shaanxi Province(2022SF–250)
  • 摘要: 采用热聚合法和原位沉积法分别制备g-C3N4、ZIF-8及不同质量比的ZIF-8/g-C3N4复合光催化材料,通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)等表征手段对其结构性质进行表征。表征结果表明,合成的ZIF-8/g-C3N4复合材料没有破坏ZIF-8与g-C3N4原始的晶体结构与形貌,且ZIF-8与g-C3N4形成了异质结,ZIF-8/g-C3N4复合材料的BET比表面积比g-C3N4提高了30多倍。光催化氧化去除NO结果表明,12.5%-ZIF-8/g-C3N4的NO氧化去除效率最佳,且不生成有毒中间产物NO2,具有最优异的光催化活性,对于NO的氧化去除率可达55.1%。机理研究表明,基于g-C3N4的异质结构不仅抑制了光生载流子的复合,而且由于g-C3N4与ZIF-8之间的协同作用,促进了可见光的吸收以及反应物分子NO的吸附,从而提高了复合材料对NO的光催化氧化性能。
  • 图  1  ZIF-8、g-C3N4和ZIF-8/g-C3N4的XRD图

    Figure  1  XRD patterns of ZIF-8, g-C3N4 and ZIF-8/g-C3N4

    图  2  ZIF-8、g-C3N4和ZIF-8/g-C3N4的傅立叶红外光谱图

    Figure  2  FTIR patterns of ZIF-8, g-C3N4 and ZIF-8/g-C3N4

    图  3  ZIF-8、g-C3N4和ZIF-8/g-C3N4的紫外-可见漫反射光谱图

    Figure  3  UV-Vis DRS of ZIF-8, g-C3N4 and ZIF-8/g-C3N4

    图  4  g-C3N4和ZIF-8/g-C3N4的光电流响应图(a)与电化学阻抗谱图(b)

    Figure  4  Photocurrent responses (a) and EIS (b) of g-C3N4 and ZIF-8/g-C3N4

    图  5  g-C3N4和ZIF-8/g-C3N4的光催化活性:NO去除率(a, c);NO2的生成量(b);ZIF-8/g-C3N4光催化去除NO的循环活性图(d)

    Figure  5  (a, c) Photocatalytic performance of different photocatalyst samples for removal of NO under visible light irradiation; (b) corresponding amount of NO2 generated over different photocatalyst samples; (d) Cyclic experiment of ZIF-8/g-C3N4 photocatalytic removal of NO

    图  6  g-C3N4(a, e)、ZIF-8(b, f)、12.5%-ZIF-8/g-C3N4(c, g)和PM-12.5%-ZIF-8/g-C3N4(d, h)的SEM图像(a ~ d)与TEM图像(e ~ h)和12.5%-ZIF-8/g-C3N4的EDS元素分布图(i~ l)

    Figure  6  SEM (a ~ d) and TEM (e~ h) images of g-C3N4(a, e), ZIF-8(b, f), 12.5%-ZIF-8/g-C3N4(c, g) and PM-12.5%-ZIF-8/g-C3N4(d, h); Elements mappings (i ~ l) of 12.5%-ZIF-8/g-C3N4

    图  7  ZIF-8、g- C3N4和12.5%-ZIF-8/g- C3N4的N2吸附-脱附曲线(a)和BJH孔径分布图(b)

    Figure  7  N2 adsorption-desorption curves (a) and BJH pore size distributions (b) of ZIF-8, g- C3N4 and 12.5%-ZIF-8/g- C3N4

    图  8  ZIF-8、g-C3N4和12.5%-ZIF-8/g-C3N4的XPS全谱(a)及高分辨Zn 2p(b)、C 1s(c)和N 1s(d)谱图

    Figure  8  XPS profiles of ZIF-8, g-C3N4 and 12.5%-ZIF-8/g-C3N4. (a) Full scan; (b) Zn 2p; (c) C 1s; (d) N 1s

    图  9  g-C3N4、12.5%-ZIF-8/g-C3N4和PM-12.5%-ZIF-8/g-C3N4的荧光光谱图

    Figure  9  PL spectra of g-C3N4, 12.5%-ZIF-8/g-C3N4 and PM-12.5%-ZIF-8/g-C3N4

    图  10  ZIF-8和g-C3N4的禁带宽度图(a)、莫特-肖特基图(b)及ZIF-8/g-C3N4光催化去除NO机理图

    Figure  10  (a) The band gaps and (b) Mott-Schottky plots of ZIF-8 and g-C C3N4; (c) Possible mechanism of photocatalytic NO removal over ZIF-8/g-C3N4

    表  1  制备ZIF-8/g-C3N4纳米复合材料的原料配比

    Table  1  Raw material ratio for preparing ZIF-8/g-C3N4 nanocomposite

    Zinc acetate2-methylimidazoleName
    0.5 mmol2 mmol6.25%-ZIF-8/g-C3N4
    1 mmol4 mmol12.5%-ZIF-8/g-C3N4
    2 mmol8 mmol25%-ZIF-8/g-C3N4
    3 mmol12 mmol37.5%-ZIF-8/g-C3N4
    4 mmol16 mmol50%-ZIF-8/g-C3N4
    下载: 导出CSV

    表  2  ZIF-8,g-C3N4和12.5%-ZIF-8/g-C3N4纳米复合材料的比表面积、孔体积和孔径

    Table  2  Specific surface areas, pore volumes and pore sizes of g-C3N4,ZIF-8 and 12.5%-g-C3N4/ZIF-8

    SampleBET specific surface area
    (m2·g−1)
    Pore volume
    (cm3·g−1)
    pore size
    (nm)
    ZIF-81244.200.05732.301
    g-C3N48.070.047928.8231
    ZIF-8/g-C3N4260.250.04882.7986
    下载: 导出CSV
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  • 收稿日期:  2022-04-22
  • 录用日期:  2022-06-01
  • 修回日期:  2022-05-31
  • 网络出版日期:  2022-06-23

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