Study Of Photocatalytic Chip And Device Integration Based Nanorod Array

With the rapid development of modern society,it is inevitable to cause serious pollution to human and ecological environment.Antibiotic had made a significant contribution to treat disease since it was discovered.However,it caused serious environmental pollution on account of loose policy and abuse in daily life,which made human in low concentration of antibiotics for a long time and caused a serious threat to human health.So,the treatment of antibiotic pollution becomes one of the main problems.At present,In order to efficiently remove the remaining antibiotics in environmental water,the current technology is mainly dependent on activated carbon adsorption,coagμLation-flotation,μLtrasound degradation,and membrane bioreactor.These methods are still confronted with the difficμLty of long time-consuming,energy consumption and poor efficiency.Clearly,there is a strong demand for fast and inexpensive method for the removal of antibiotics from contaminated water.Therefore,new governance technologies need to be explored urgently.Semiconductor photocatalysis has attracted intense attentions due to their wide application to environmental remediation,especially for organic pollutants degradation.ZnO possessed a broadband gap（3.2eV）was extensively researched as a semiconductor photocatalysis at home and abroad due to its many advantages such as fast electronic transmission,high photocatalytic efficiency,cheap and friendly environment.ZnO nanomaterials have many features and are easy to prepare.In the numerous ZnO nanostructures,one-dimensional nano-rod structure has efficient electron transport capability,which is the first choice in the field of treatment of environmental pollution as photocatalyst.In this paper,ZnO nanorod array,ZnO@ZnS core-shell nanorod array and ZnO@ZnS@Bi₂S₃ core-shell-shell nanorod array were synthesized by using the method of wet and heat synthesis.The as-synthesized methods and conditions of those materials,the effect of the enhanced ZnO@ZnS core-shell nanorod array on the photocatalytic treatment environment and photothermal conversion performance of ZnO@ZnS@Bi₂S₃core-shell-shell nanorod array were mainly studied.The research is carried out from the following aspects:（1）In this design,p-Si wafers were chosen as a substrate to fabricate nanorod arrays.Well-aligned ZnO nanorod arrays were grown on Si wafers by a two-step way including a seed layer growth and nanorods growth.Firstly,A seed layer of ZnO was grown on the Si substrate through calcination of Zn（CH₃COO）₂.In this paper,the influence of different concentration of seed solution for ZnO nanorod arrays was studied systematically.Finally,mixed solution（Zn（NO₃）₂/HMTA）as a growth solution was used to prepare Well-aligned ZnO nanorod arrays,and the influence of different concentration of growth solution for ZnO nanorod arrays was also investigated systematically.Studies have shown that the best concentration of seed solution is 5mmol/L,calcination temperature 130℃and the best concentration of growth solution is 50 mmol/L.（2）Due to using ZnO nanorod array as a precursor template,a layer of ZnS was covered by surface replacement of ZnO to ZnS through adding thioacetamide solution providing S^2-.Finally,the enhanced chip photocatalyst-ZnO@ZnS nanorods array was come true.In this paper,the effects of different concentrations of thioacetamide solution and different reaction time for the morphology and catalytic property of the enhanced photocatalyst were studied systematically.Studies have shown that the optimal concentration of thioacetamide solution is 30 mmol/L and the reaction time is 4 h.（3）Tetracycline hydrochloride,a most widely used antibiotics,was utilized as a simulated pollutant.To investigate the photocatalytic performances of as-synthesized nanorods array chip,we carried out a series of control experiments.Studies have indicated that as-synthesized ZnO@ZnS nanorods array chip exhibits significantly enhanced photocatalytic performances.Degradation efficiency reached 80.9%within illuminating 140 min and degradation rate kept at 0.0119 min^-1.The research shows that the degradation rate increased by 35%after the integration of the chip with a device that made full use of the chip photocatalyst.（4）Bi₂S₃ had strong photothermal conversion performance was coated on the surface of ZnS of ZnO@ZnS nanorod arrays.A photothermal conversion material with strong full spectrum absorption was prepared in this study.The photodegradation of Rhodamine B solution showed that the photocatalytic performance of ZnO@ZnS@Bi₂S₃ was obviously weakened.