| In recent years,carbon materials and carbon-nitrogen materials have been widely used in photocatalysis,electrocatalysis,electrode materials,which are attributed to simple preparation stage and strong adsorption capacity,however low visible light utilization and poor conductivity restrict their application.Therefore,searching a suitable material doped in them is a good choose to develop new carbon materials and new catalysts of carbon and nitrogen materials.In this study,g-C3N4-agar 3D aerogel was prepared by heating and cooling polymerization.g-C3N4-PANI composite photocatalyst was prepared by in-situ polymerization.3D RGO-PANI was prepared by simple green one-step hydrothermal method.X-ray diffractometry,fourier transform infrared spectroscopy,transmission electron microscopy,field emission scanning electron microscopy,X-ray energy spectroscopy,X-ray photoelectron spectroscopy,N2 adsorption and desorption,UV-visible diffuse reflectance spectroscopy,the time-resolved and steady-state photoluminescence spectroscopy,photocurrent response,electrochemical impedance spectroscopy were used to characterize the crystal structure,chemical structure,morphology,specific surface area,band structure,optical property and electrochemical property of the photocatalyst;degradation of the target simulated wastewater such as ciprofloxacin hydrochloride,oxytetracycline,methylene blue,and rhodamine B by simulated visible light were used to evaluate the photocatalytic performance of the prepared catalysts.This study provides a new idea and is beneficial to graphite-like phase carbonized nitrogen and graphene photocatalysts in development of antibiotic and dye wastewater treatment applications.The main research contents and conclusions are as follows:?1?Study on the preparation,characterization and photocatalytic activity of g-C3N4-agar aerogel composites:The g-C3N4-agar hybrid aerogel was obtained by a heating-cooling polymerization process with agar and g-C3N4 powder as the raw material,which showed outstanding adsorption properties due to its three-dimensional network structure.Under the synergistic effect of adsorption and photocatalytic degradation,the hybrid aerogels could effectively remove organic pollutants from wastewater.The optimized 60%g-C3N4-agar sample exhibited preferable simulated-sunlight photocatalytic degradation efficiency towards the methylene blue and ciprofloxacin,as well as excellent recycle performance.?2?Preparation,characterization and photocatalytic properties of g-C3N4-polyaniline?PANI?composites:g-C3N4-PANI composites were synthesized by in-situ polymerization under ice bath using g-C3N4 and aniline as raw materials.The experimental results show that the degradation efficiency of g-C3N4-agar have been greatly improved than that of pure g-C3N4.There are stronger photocurrent responses of g-C3N4-PANI,in addition,the addition of PANI also greatly enhances the absorption of visible light,which are also the reasons for the improvement of photocatalytic performance.Among them,the composite photocatalyst with mass fraction of 5%PANI has the best degradation performance.In addition,the photocatalytic hydrogen production performance of 5%PANI was investigated.The maximum hydrogen production in the fourth hour of photocatalytic hydrogen production reached a maximum of163.21?mol·h-1·g-1.?3?Study on preparation,characterization and photocatalytic activity of 3D RGO-PANI aerogel materials:Graphene was prepared by modified Hummers method,polyaniline was prepared by chemical redox polymerization,and then 3D RGO-PANI was prepared by one-step hydrothermal method.The pore structure,mechanical properties and adsorption properties of the sample are regulated by adjusting the ratio of graphene to polyaniline,the temperature of hydrothermal reduction,and the reaction time.The experimental results show that the graphene:polyaniline=1:1 prepared at 150?for 24 h has the best degradation performance while the graphene:polyaniline=3:2 for the best oil absorption performance. |
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