Electrospinning Preparation Of Heterostructure Titanium Dioxide-based Composite Photocatalyst And Its Photocatalytic Performance

With the rapid development of the industrialization of contemporary society,the country's comprehensive strength has been greatly improved.However,behind this was the cost of sacrificing the environment,the environmental pollution has becoming more and more serious,and the ecological environment on which human beings depend has suffered severe damage.Nowadays,the demand for fresh air,clear water and clean environment has becoming more and more urgent.The improvement of the country's economic strength has led to a significant improvement in the standard living of the people,and people's awareness of environmental protection has gradually increased.Since the 18th National Congress of the Communist Party of China,the leadership of the Party Central Committee,represented by General Secretary Xi Jinping,has attached great importance to the improvement of the ecological environment.He has repeatedly stressed that"it must not be at the expense of the ecological environment in exchange for the temporary development of the economy",repeatedly on different occasions.Regarding the protection of the ecological environment,the General Secretary repeatedly emphasized that it is necessary to“calculate long-term accounts,calculate overall accounts,and calculate consolidated accounts”.All of this reflects the inextricable relationship between the ecological environment and people's lives.A polluted environment can cause great damage to human body tissues and can cause a variety of diseases.The annual losses caused by environmental pollution are enormous,and the manpower and material resources behind the pollution problems are countless.Therefore,there is an urgent need for an efficient,fast,and non-polluting technology to repair the already damaged ecological environment,to make the forests become sullen again,to re-dye the earth into green,to make the sky blue again,and to make the rivers clear again.Let the grasslands re-green,make the ecological environment better and better,and contribute to the blueprint for building a beautiful China.Photocatalytic technology is a green technology that can reasonably convert the light energy in nature into a chemical energy.It can completely convert organic pollutants in liquid?water?,gaseous?air?and solid?soil?into water,carbon dioxide and inorganic salts.Over the years,it has played a leading role in the construction of ecological and environmental civilization.The choice of photocatalyst is the most important part of the photocatalytic technology and plays a direct role in determining the photocatalytic effect.There are a wide variety of materials that can be used as photocatalysts,and the semiconductor materials stand out among many materials because of their economic,stable and harmless properties.The n-type semiconductor titanium dioxide?TiO₂?has attracted much attention in the semiconductor photocatalytic materials studied due to its morphology controllability,chemical-physical stability,non-toxicity,strong oxidation and strong reducibility.However,since it has a wide band gap?3.2eV?and thus absorption of the solar light source range was limited,it was difficult to have high photocatalytic performance.In addition,the form of TiO₂ is mostly in the form of a powder,which causes its recycling to become a major problem.In view of the defects of TiO₂,the advanced electrospinning technology was modified by other methods,and different series of composite photocatalyst materials were synthesized and their photocatalytic properties under visible light irradiation were explored.The first series is the combination of TiO₂ and ferric oxide?Fe₂O₃?.Firstly,Fe₃O₄/TiO₂ composite fibers doped with ferroferric oxide?Fe₃O₄?were prepared by electrospinning technique.Then,the Fe₂O₃/TiO₂ fibers were synthesized by subsequent sintering.The effects of different sintering temperatures on the performance of the sample photocatalysts were analyzed,and the photoelectric properties of the photocatalysts were tested accordingly.The prepared Fe₂O₃/TiO₂ photocatalyst enhanced the utilization range of TiO₂ for light source,and the addition of Fe₂O₃ made the material have certain flexibility and magnetic properties.However,since the photocatalytic performance of the photocatalyst after the composite of Fe₂O₃ was poor,therefore,we conducted a second series of studies on the combination of TiO₂ and carbon nitride?g-C₃N₄?.Synthetic?tetrabutyl titanate?TBOT/PVP nanofibers were firstly synthesized by flexible electrospinning technology,followed then by by the means of sintering to one-step synthesized the g-C₃N₄/TiO₂.G-C₃N₄/TiO₂ not only adjusted the response range of TiO₂to the light source,but also effectively promoted the separation of photogenerated carriers and improved the photocatalytic performance of the material.In this paper,electrospinning technology was used as the main preparation technology,and different series of modified visible light-responsive TiO₂-based composite phootocatalysts were synthesized.Our work provided a useful reference for the preparation of other photocatalytic nanomaterials in combination with electrospinning technology in the future.