三元金属硫化物-石墨相氮化碳异质结催化剂的制备及光催化性能

发布时间：2018-12-12 22:26

【摘要】：以双氰胺、醋酸锌、钼酸铵、醋酸镉和硫化钠为原料,采用水热法合成了一系列Zn-Mo共掺杂CdS(Zn-Mo-CdS),并与g-C_3N_4组成异质结催化剂(Zn-Mo-CdS/g-C_3N_4)。采用X射线衍射光谱(XRD)、紫外-可见(UV-Vis)光谱、电感耦合等离子体-原子发射光谱(ICP-AES)、电化学阻抗谱(EIS)、X光电子能谱(XPS)等分析手段对制备的催化剂进行了表征。结果表明,Zn-Mo-CdS与g-C_3N_4之间紧密结合并形成异质结,促进界面电荷迁移,抑制光生电子-空穴对的复合。以可见光下降解染料罗丹明B(Rh B)为探针反应考察了催化剂性能。结果表明,Zn-Mo-CdS/g-C_3N_4异质结催化剂的光催化性能与单纯g-C_3N_4、Zn-Mo-CdS及双金属硫化物/g-C_3N_4异质结催化剂相比均有大幅度提高,质量比m(Zn-Mo-CdS)/m(g-C_3N_4)=4:1时制备的异质结催化剂表现出最大的降解速率常数,是单纯g-C_3N_4和Zn-Mo-CdS的30倍和10倍。不仅Zn-Mo-CdS,其他三元金属复合硫化物如Mo-Ni-CdS和Ni-Sn-CdS与g-C_3N_4之间也能有效构筑异质结,促进电子-空穴对的分离和催化性能提升。
[Abstract]:A series of Zn-Mo co-doped CdS (Zn-Mo-CdS) were synthesized by hydrothermal method from dicyandiamide, zinc acetate, ammonium molybdate, cadmium acetate and sodium sulfide. The heterojunction catalyst (Zn-Mo-CdS/g-C_3N_4) was formed with g-C_3N_4. X-ray diffraction (XRD) (XRD), UV-Vis (UV-Vis), inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and electrochemical impedance spectroscopy (EIS),) were used. The catalysts were characterized by X-ray photoelectron spectroscopy (XPS). The results show that Zn-Mo-CdS and g-C_3N_4 bind closely and form heterojunctions which promote the interface charge transfer and inhibit the photogenerated electron-hole pair recombination. The catalytic activity of Rhodamine B (Rh B) was investigated by using visible light as probe. The results showed that the photocatalytic activity of Zn-Mo-CdS/g-C_3N_4 heterojunction catalyst was significantly higher than that of g-C _ 3N _ 3C _ 3N _ 4C _ 3N _ 4H _ n-Mo-CdS and bimetallic sulfide / g-C_3N_4 heterojunction catalysts. When the mass ratio m (Zn-Mo-CdS) / m (g-C_3N_4) is 4:1, the heterojunction catalyst exhibits the maximum degradation rate constant, which is 30 and 10 times higher than that of g-C_3N_4 and Zn-Mo-CdS alone. Not only other ternary metal sulfides such as Zn-Mo-CdS, such as Mo-Ni-CdS and Ni-Sn-CdS, but also g-C_3N_4 can effectively construct heterojunctions and promote the separation and catalytic performance of electron-hole pairs.
【作者单位】：辽宁石油化工大学化学化工与环境学部;
【基金】：辽宁省自然科学基金(2015020590) 辽宁省普通高等学校创新创业教育改革试点专业建设项目资助~~
【分类号】：O643.36

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