Defect engineering, exposed crystal facets, and Z-scheme mechanism are promising strategies to greatly promote photocatalytic performance. Herein, the ZnFe 2 O 4 (ZFO) with Ag-doping, oxygen vacancies and different exposed crystal facets was firstly prepared by a facile hydrothermal strategy. Subsequently, the MoS 2 flowers were in-situ grown on the surface of the prepared Ag-doping ZFO (Ag-ZFO) for fabricating MoS 2 /Ag-ZFO Z-scheme heterojunction by hydrothermal strategy. Due to the synergistic effects of defect engineering (Ag-doping and oxygen vacancies), exposed crystal facets, and Z-scheme mechanism, the photocatalytic activity for tetracycline degradation was evidently improved. More importantly, the prepared MoS 2 /Ag-ZFO (T) also show excellent photocatalytic performance under real environment water. This work offers a new insight for future design and development of highly active photocatalysts.
Ying Li,Kang Liu,Xin Li,Xuan Jin,Jinze Lyu,Yuebing Xu,Haiyan Zhu,Gang Shi
It is difficult for metal-modified semiconductor nanotubes to obtain surface-enhanced Raman scattering (SERS) substrates through long-range ordered 3D assembly, which adversely affects both Raman signal enhancement and Raman signal uniformity. Here, ZnFe 2 O 4 nanotubes with Ag nanoparticles modified on the inner and outer walls are induced to grow on the surface of the ordered Si pyramid by ZnO nanonedles as sacrificial templates. In this way, the composite nanotubes (Ag/ZnFe 2 O 4 ) are assembled into dandelion flower-like 3D aggregates with a periodic arrangement of hexagonal close packing. This 3D ordered SERS substrate based on Ag/ZnFe 2 O 4 nanotubes has excellent anti-reflective performance and carrier separation ability, which is conducive to the enhancement of Raman signal. When the SERS substrate is used as a sensor, it can achieve the single molecule (10 −13 M) detection level of Rhodamine 6 G, the enhancement factor (EF) is 3.14 × 10 9 , and the linear fit (R 2 ) of quantitative analysis is as high as 0.998 from 10 −13 to 10 −4 M. Meanwhile, the long-range ordered arrays on the SERS substrate can ensure the signal uniformity of sensor, which relative standard deviation (RSD) is as low as 3.37 %. In addition, the photocatalytic self-cleaning capability of SERS substrate ensures that the sensor can be reused. Finally, the mechanism of the photogenerated carrier migration of Ag/ZnFe 2 O 4 and its contribution to Raman signal enhancement were analyzed.
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