高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (9): 2896.doi: 10.7503/cjcu20210255

• 物理化学 • 上一篇    下一篇

双功能复合材料g-C3N4/CdS/Ni催化光解水产氢和5-羟甲基糠醛氧化性能

李晨晨, 那永()   

  1. 哈尔滨工业大学化工与化学学院, 哈尔滨 150001
  • 收稿日期:2021-04-16 出版日期:2021-09-10 发布日期:2021-09-08
  • 通讯作者: 那永 E-mail:yongna@hit.edu.cn
  • 基金资助:
    国家自然科学基金(21603046);黑龙江省自然科学基金(YQ2019B003)

g-C3N4/CdS/Ni Composite as a Bifunctional Photocatalyst for H2 Generation and 5-Hydroxymethylfurfural Oxidation

LI Chenchen, NA Yong()   

  1. School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,China
  • Received:2021-04-16 Online:2021-09-10 Published:2021-09-08
  • Contact: NA Yong E-mail:yongna@hit.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21603046);the Nature Science Foundation of Heilongjiang Province, China(YQ2019B003)

摘要:

采用高温煅烧法、 原位生长法和光还原法分三步制备出双功能复合光催化剂g-C3N4/CdS/Ni. 材料中CdS的引入可以增强光生电子和空穴的分离效率, Ni可以进一步提高光致产氢速率. 在以三乙醇胺(TEOA)为电子给体的水溶液中对所制备的材料进行了催化产氢性能测试, 并对材料中CdS的含量进行了优化. 结果表明, 25% (质量分数)CdS负载量的复合材料催化产氢性能最佳, 其催化产氢速率为4134.5 μmol·g-1·h-1, 是 g-C3N4/Ni催化产氢速率的115倍. 且Ni是一种良好的质子催化剂. 在此基础上, 以5-羟甲基糠醛(HMF)替代TEOA作为体系的电子给体, 其可以被选择性地催化氧化为增值化学品2, 5-二甲酰基呋喃(DFF). 当体系中HMF的转化率为82.3%, DFF的选择性为69.4%时, DFF的产率(57.2%)达到最高, 体系中H2的产量为 51.8 μmol/g. g-C3N4/CdS/Ni复合材料可以在同一体系中进行催化光致产氢和HMF的选择性氧化.

关键词: 光催化, 选择性氧化, 5-羟甲基糠醛, 2, 5-二甲酰基呋喃, 氢气

Abstract:

The bifunctional photocatalyst g-C3N4/CdS/Ni was synthesized by high temperature calcination, in situ growth method and photoreduction method in three steps. The introduction of CdS in this composite can enhance the separation rate of photogenerated holes and electrons. And the loading of Ni can further improve the photoinduced hydrogen production rate. In addition, the photocatalytic hydrogen evolution reaction was carried out in triethanolamine(TEOA, hole sacrificial agent) aqueous solution and the optimal CdS content of the composite was determined. Experiments showed that the composite with 25%(mass fraction) CdS exhibited the best photocatalytic activity and the Ni was a good cocatalyst for hydrogen production. The highest H2 gene- ration rate catalyzed by g-C3N4/25CdS/Ni composite was 4134.5 μmol·g-1·h-1, which was 115 times higher than that of g-C3N4/Ni composite. Subsequently, the TEOA in this system was replaced by 5-hydroxymethylfurfural(HMF). HMF can be selectively oxidized to the value-added chemical 2,5-diformylfuran(DFF). When the conversion of HMF was 82.3% and the selectivity of DFF was 69.4%, the yield of DFF was up to the highest(57.2%). At the same time, the yield of H2 in this system was 51.8 μmol/g. In summary, g-C3N4/CdS/Ni composite can catalyze photoinduced H2 evolution and HMF selective oxidation in the same system.

Key words: Photocatalysis, Selective oxidation, 5-Hydroxymethylfurfural, 2, 5-Diformylfuran, Hydrogen

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