Mo-Zn_(0.5)Cd_(0.5)S@NiCo_(2)S_(4)掺杂-异质结体系的制备及其双功能光催化性能研究

Preparation of Mo-Zn_(0.5)Cd_(0.5)S@NiCo_(2)S_(4)Doped-Heterojunction System and Its Bifunctional Photocatalytic Performance

采用溶剂热与水热法制备了Mo-Zn_(0.5)Cd_(0.5)S@NiCo_(2)S_(4)掺杂-异质结光催化剂,系统表征了光催化剂的晶体结构、元素组成、微观形貌和光电性能,通过差分电荷密度的计算并阐释了电子转移方向。结果表明,Mo的掺杂改变了Zn_(0.5)Cd_(0.5)S的晶格和能带结构,异质结的构筑增加了光催化活性位点,加快了电子转移速率。在可见光照射下,通过降解四环素(TC)溶液同时产氢来考察双功能光催化剂的活性。60 min内,TC的降解率可达75%,氢气产量达1146.72μmol/g/h。

The Mo-Zn_(0.5)Cd_(0.5)S@NiCo_(2)S_(4)doped-heterojunction system was prepared by solvent thermal and hydrothermal methods,and the crystal structure,surface composition,microscopic morphology and photovoltaic properties of the photocatalyst were systematically analyzed,and transient photocurrent characterization methods,and the electron transfer direction was elucidated by differential charge calculation.The results showed that the doping of Mo changed the lattice and energy band structure of Zn_(0.5)Cd_(0.5)S,and the construction of heterojunctions increased the photocatalytic active sites and accelerated the electron transfer rate.The photocatalytic activity was investigated by degrading tetracycline(TC)solution with H_(2) evolution under visible light irradiation.The optimal TC degradation of 75%and H_(2) evolution rate of 1146.72μmol/g/h were achieved within 60 min.