Zn_xCd(1-x)S/TiO_2异质结复合纤维的制备及其光催化性能

Preparation and photocatalytic activity of Zn_xCd(1-x)S/TiO_2 heterostructures composite fibers

通过静电纺丝和水热法联用成功制备了ZnxCd1-xS/TiO2纳米纤维。利用XRD、SEM、UV-vis、EDS、BET等分析测试手段对样品的结构、光学性能及形貌进行表征。用罗丹明B(RB)模拟有机污染物进行了光催化降解实验。结果表明,在TiO2纳米纤维上长了一层致密地ZnxCd1-xS颗粒,形成了ZnxCd1 xS/TiO2异质结复合纤维,且其光谱响应范围拓宽至可见光区,与纯TiO2纳米纤维相比,可见光催化活性明显提高。当水热时间为24 h时,ZnxCd1-xS/TiO2复合纤维的光催化活性最高,RB溶液在可见光下降解1 h,脱色率达到90.87%,并且该样品易于分离、回收和再利用。

ZnxCd1-xS/TiO2 nanofibers were successfully synthesized by the combination of electrospinning technique and hydrothermal method.These nanofibers were characterized for the structural,optical,and morphological properties by XRD,SEM,UV-vis,EDS and BET.The result showed that ZnxCd1-xS nanoparticles could tightly grow on the TiO2 nanofibers surface and thus ZnxCd1-xS/TiO2 heterostructures composite materials were successfully obtained.The UV-vis analysis indicated that the absorption spectrum of the sample was extended to the visible light region.Compared with pure TiO2 fibers,ZnxCd1-xS/TiO2 nanofibers exhibited enhanced photocatalytic activity in the decomposition of Rhodamine B（RB） under visible light.When the hydrothermal time was 24 h,the decoloration rate of the sample could reach 90.87% in one hour,which owed the best photlcatalytic activity,and was easily separated,removed from the system after reaction and reuse.