Synthesis and Efficient Visible Light Photocatalytic Hydrogen Evolution of Polymeric g-C3N4 Coupled with CdS Quantum Dots
Synthesis and Efficient Visible Light Photocatalytic Hydrogen Evolution of Polymeric g-C3N4 Coupled with CdS Quantum Dots
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CdS量子点耦合聚合物g-C3N4的合成及高效可见光催化析氢
DOI：
10.1021/jp3041692
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发表时间：
2012-06-28
影响因子：
3.7
通讯作者：
Feng, Pingyun
中科院分区：
文献类型：
--
作者：
Ge, Lei;Zuo, Fan;Feng, Pingyun
通过化学浸渍法合成了新型硫化镉量子点（QD）耦合的石墨相氮化碳（g - C3N4）光催化剂，并利用X射线衍射、透射电子显微镜、紫外 - 可见漫反射光谱、X射线光电子能谱、傅里叶变换红外光谱和光致发光光谱对其进行了表征。在甲醇水溶液中以铂作为助催化剂，研究了不同硫化镉负载量下硫化镉含量对可见光光催化析氢速率的影响。g - C3N4和硫化镉量子点的协同作用使得光生载流子能够有效分离，从而提高了材料的可见光光催化产氢活性。确定硫化镉量子点的最佳含量为30 wt%，在可见光照射下相应的析氢速率为17.27 μmol·h⁻¹，约为纯g - C3N4的9倍。提出了硫化镉/ g - C3N4复合材料可能的光催化机制，并通过光致发光光谱和光电化学曲线进行了验证。
Novel CdS quantum dot (QD)-coupled graphitic carbon nitride (g-C3N4) photocatalysts were synthesized via a chemical impregnation method and characterized by X-ray diffraction, transmission electron microscopy, ultraviolet-visible diffuse reflection spectroscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and photoluminescence spectroscopy. The effect of CdS content on the rate of visible light photocatalytic hydrogen evolution was investigated for different CdS loadings using platinum as a cocatalyst in methanol aqueous solutions. The synergistic effect of g-C3N4 and CdS QDs leads to efficient separation of the photogenerated charge carriers and, consequently, enhances the visible light photocatalytic H-2 production activity of the materials. The optimal CdS QD content is determined to be 30 wt %, and the corresponding H-2 evolution rate was 17.27 mu mol.h(-1) under visible light irradiation, similar to 9 times that of pure g-C3N4. A possible photocatalytic mechanism of the CdS/g-C3N4 composite is proposed and corroborated by photoluminescence spectroscopy and photoelectrochemical curves.