空心绣球状MoS_(2)/ZnS/ZnO异质结材料的制备及太阳光下降解四环素的研究

Preparation and tetracycline degradation of hollow hydrangeousMoS_(2)/ZnS/ZnO heterojunction materials

采用水热法制备绣球状ZnO纳米微球,再以其为晶核,通过原位生长及氨的渗入腐蚀成功制备了空心绣球状MoS_(2)/ZnS/ZnO异质结光催化材料。采用SEM、TEM、XRD、XPS、BET及UV-VIS对样品的形貌、组织结构、成分、比表面积及光吸收等性能进行了表征。探讨了空心绣球状MoS_(2)/ZnS/ZnO异质结材料的形成机制,研究了空心绣球状MoS_(2)/ZnS/ZnO异质结材料催化降解机理及四环素的降解过程。结果表明:尺寸均一、比面积大的空心绣球状MoS_(2)/ZnS/ZnO异质结材料不仅能实现宽窄带隙材料的有效杂化,促进材料对太阳光中可见光的利用,还能使光生电子及空穴分别转移至ZnO CB和MoS_(2)VB中,有效地分离了光生电子空穴,光催化性能最佳。在太阳光模拟器的照射下反应2 h之后,8 h合成的空心绣球状MoS_(2)/ZnS/ZnO异质结材料对四环素的降解效果最好,降解率高达91%。

Hollow hydrangea spheroidal MoS_(2)/ZnS/ZnO heterojunction photocatalytic materials were successfully prepared by in-situ growth and ammonia infiltration by using hydrangea ZnO nanospheres as crystal nuclei.The morphology,microstructure,composition,surface area and light absorption of the samples were characterized by SEM,TEM,XRD,XPS,BET and UV-VIS absorption.The formation mechanism of hollow hydrangea spheroidal MoS_(2)/ZnS/ZnO heterojunction materials was discussed.The catalytic degradation mechanism of MoS_(2)/ZnS/ZnO heterojunction materials and tetrycline degradation process were studied.The results show that the hollow spheroidal MoS_(2)/ZnS/ZnO heterojunction materials with uniform size and large specific area can not only realize the effective hybridizing of wide and narrow band gap materials,promote the utilization of visible light in sunlight,but also transfer photogenerated electrons and holes to ZnO CB and MoS_(2) VB respectively,effectively separate photogenerated electron holes.Under the irradiation of the solar simulator for 2 h,the hollow hydrangea MoS_(2)/ZnS/ZnO heterojunction synthesized at 8 h showed the highest degradation rate of tetracycline,reaching 91%.