In_(2)S_(3)/MgIn_(2)S_(4)异质结光催化材料的制备及其性能

Preparation and photocatalytic properties of In_(2)S_(3)/MgIn_(2)S_(4) heterojunction photocatalysts

通过溶剂热法以In_(2)S_(3)花球和MgIn_(2)S_(4)前驱体为原料制备了In_(2)S_(3)/MgIn_(2)S_(4)异质结光催化剂。通过XRD、SEM、DRS和电化学测试等表征所制备样品的晶体结构、形貌、光学和光电化学特性。用可见光降解甲基橙测定了In_(2)S_(3)/MgIn_(2)S_(4)异质结光催化剂的光催化活性。实验结果表明,In_(2)S_(3)/MgIn_(2)S_(4)异质结构有效提高了MgIn_(2)S_(4)的可见光吸收能力和光生电子-空穴分离能力,使得光催化降解效果明显增强。当In_(2)S_(3)与MgIn_(2)S_(4)的质量比为0.03∶1时,In_(2)S_(3)/MgIn_(2)S_(4)-2具有最高的光催化活性。可见光照射40min后,In_(2)S_(3)/MgIn_(2)S_(4)-2对甲基橙的降解率达到96.1%。经过4次循环实验,异质结材料仍能保持较好的光催化活性,表明其具有良好的重复利用性。

In_(2)S_(3)/MgIn_(2)S_(4) heterojunction photocatalysts were prepared by the solvothermal method using In_(2)S_(3) flower spheres and MgIn_(2)S_(4) precursors as raw materials.The crystal structure,morphology,optical and photoelectrochemical properties of the prepared samples were characterized by XRD,SEM,DRS and electrochemical measurements.The photocatalytic activity of In_(2)S_(3)/MgIn_(2)S_(4) heterojunction photocatalysts was determined by visible-light degradation of methyl orange.The experimental results showed that In_(2)S_(3)/MgIn_(2)S_(4) heterostructure effectively enhanced the visible-light absorption and photogenerated electron-hole separation of MgIn_(2)S_(4),which greatly improved the photocatalytic degradation performance.In_(2)S_(3)/MgIn_(2)S_(4)-2 had the highest photocatalytic activity when the mass ratio of In_(2)S_(3) to MgIn_(2)S_(4) was 0.03∶1.The degradation of methyl orange by In_(2)S_(3)/MgIn_(2)S_(4)-2 reached 96.1%,after 40 min of visible-light irradiation.After four cycling experiments,the heterojunction material can still retain good photocatalytic activity,indicating that it possesses good reusability.