Preparation and tetracycline degradation of hollow hydrangeous MoS2/ZnS/ZnO heterojunction materials
Hollow hydrangea spheroidal MoS2/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 MoS2/ZnS/ZnO heterojunction materials was discussed.The catalytic degradation mechanism of MoS2/ZnS/ZnO heterojunction materials and tetrycline degradation process were studied.The results show that the hollow spheroidal MoS2/ZnS/ZnO heterojunction mate-rials 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 photoge-nerated electrons and holes to ZnO CB and MoS2 VB respectively,effectively separate photogenerated e-lectron holes.Under the irradiation of the solar simulator for 2 h,the hollow hydrangea MoS2/ZnS/ZnO heterojunction synthesized at 8 h showed the highest degradation rate of tetracycline,reaching 91%.
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