层状结构硫化物KSb5S8用于可见光催化降解甲基橙的研究

Visible light driven photoderadation of KSb5S8 with layered crystal structure for MO

采用硫脲自助熔方法制备光催化材料KSb5S8,通过X射线多晶衍射对其进行结构表征,并将其用于降解甲基橙(MO)溶液的研究。光催化降解MO溶液实验表明,当溶液的pH=2时,KSb5S8对MO溶液的降解率远高于g-C3N4,在20min内其降解率可达到99%,且符合一级动力学模型。光催化活性自由基捕获实验表明,空穴(h+)是主要的氧化活性物种。光催化循环实验表明,KSb5S8具有较高的光催化稳定性。

The synthesis of KSb5S8 via a self-flux method and its photodegradation of methyl orange(MO)solution under visible light irradiation were reported.The crystal structure of KSb5S8 was characterized by powder-X ray diffraction.In contrast to the state-of-art layered g-C3N4,KSb5S8 had preferable photocatalytic performance over MO solution,and the photodegradation ratio could be reached to 99%within 20min at pH=2,the corresponded photodegradation dynamic reaction could be evaluated by the pseudo-first-order model.Trapping experiments revealed that hole(h+)acted as an critical role in the photocatalytic reaction.Further,cycling running experiments indicated that KSb5S8 embraced relatively high photocatalytic stable performance.A substantial guidance was offered to design,and discovered novel efficient sulfide photocatalyst with layered crystal structure.