| With the development of pharmaceutical technology,antibiotics have been generous used in the treatment of human and animal sickness because of their good effect and quick effect,which makes them become new environmental pollutants,which is a hidden danger to the ecosystem and human health and safety.Photocatalytic oxidation technology has been used in the degradation of organic wastewater due to its low final cost,simple operation and wide application.The traditional single group of photocatalyst is mainly represented by Ti O2,which has many problems in photocatalytic degradation of organic wastewater,such as low visible light response,wide energy gap and not easy to recycle.Therefore,some researchers have supported Ti O2 and g-C3N4 and other single component catalysts on other materials to improve their photocatalytic performance,such as Ti O2/Si O2,Ti O2/Zn O and Ti O2/Cd S,etc.However,they all have defects such as poor stability,prone to solidarity and low heteroatom dispersion,which restrict their application in wastewater treatment.It is of great important and application value to research a photocatalyst with high response to visible light,good photocatalytic effect,easy retrieve and good stability for the degradation treatment of organic wastewater.The specific research work of this paper is to prepare Fe-MOF by thermal solvent method,and on this basis,Fe/Zn-MOF,CNTs/Fe/Zn-MOF-700 and Gr/Fe/Zn-MOF-700 composites were prepared by in-situ synthesis and external doping,respectively.The photocatalytic activity of ciprofloxacin by the above materials was evaluated and the possible reaction mechanism was proposed.The main tasks are as below:（1）Fe-MOF material was prepared by thermal solvent method,and composite photocatalyst containing Fe3C was prepared by high temperature annealing using this as sacrificial template.The influence of temperature on the performance of composite photocatalyst was explored by adjusting annealing temperature.The morphology,composition,crystal form and specific surface area of the catalyst were analyzed by various characterization techniques.The catalyst with the best degradation effect of ciprofloxacin was selected through experiments to determine the best synthesis conditions of the catalyst,and then the stability of Fe-MOF composite catalyst was evaluated through cycle performance test.（2）Fe/Zn-MOF composite catalyst was prepared by modification of Fe-MOF with doping of Zn element.The change rule of the photocatalytic activity of the composite material was explored by changing the molar ratio of Fe and Zn and adjusting the annealing temperature.The morphology,composition,crystal shape,specific surface area and surface element composition of the catalyst were analyzed by modern characterization technology.The optimum synthesis conditions of the catalyst were determined by experiments,and the stability of Fe/Zn-MOF composite catalyst was evaluated.The photocatalytic mechanism of Fe/Zn-MOF-700 on ciprofloxacin was analyzed in terms of visible light response,active group and band gap structure.（3）CNTs/Fe/Zn-MOF-700 and Gr/Fe/Zn-MOF-700 catalysts were prepared by mixing Fe/Zn-MOF-700 with carbon nanotubes and graphene as templates,and loading Fe/Zn-MOF-700 on carbon nanotubes and graphene by high temperature annealing under the protection of nitrogen.The morphology and contents of the catalyst were characterized by the characterization technique,and the most active catalyst for ciprofloxacin was selected by the photocatalytic experiment,and the reasons for the change of the degradation effect of the composite catalyst for the degradation of ciprofloxacin were analyzed. |
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