Preparation Of Carbon, Nitrogen And Sulfur Doped Black TiO₂(B) Nanorods And Their Visible Light Catalytic Performance

In recent years,the development of industry and the progress of technology have provided a lot of convenience for human life.The improvement of high-tech means has made human life enter a new era.Green chemistry has become an important goal for many researchers.At present,semiconductor materials are the most popular and stable catalyst materials.Scientists use the photocatalytic properties of semiconductor materials to degrade pollutants.Among many semiconductor catalysts,TiO₂ has a high catalytic activity,and it is more in line with the requirements of green chemistry.It is non-toxic and harmless,with a low manufacturing cost,and it is more suitable for mass production and practical life.Even so,TiO₂ still has many problems to be solved.For example,due to its narrow band gap,it can only be absorbed in the area of ultraviolet light,and its absorption capacity is low under solar light,which is not conducive to practical use.At the same time,it has a strong ability of electron and hole recombination,which greatly shortens the life of photoborne carriers.This series of problems make the photocatalytic performance of TiO₂ low and inhibit its use.So solving the above two problems is an important task for many scientific research groups.This paper focuses on the modification of TiO₂ and the preparation of black C,N,S co-doped titanium dioxide B phase structure by means of hydrothermal co-doping and in-situ reduction self-doping of NaBH₄.In order to characterize the catalysts,XRD,XPS,uv-vis and other characterization methods were used to analyze the catalysts.At the same time,in order to explore its photocatalytic performance,a series of performance tests were carried out to analyze the possible mechanism of the catalyst according to the conclusions obtained.The main research of this paper includes:?1?With tetrabutyl titanate as carbon source and cysteine as doped element source,single crystal C,N and S doped TiO₂ nanorods were prepared by hydrothermal method.The degradation rates of RhB and phenol were 90%and 92%,respectively.The efficiency of photocatalytic reduction Cr?VI?was 95%,and the hydrogen production efficiency was 149.65 mol h^-1 g^-1.?2?As the degradation efficiency of TiO₂ nanorods doped with single crystal C,N and S is still not superior,the in-situ reduction method of NaBH₄ is adopted to realize the self-doping of Ti³⁺.The black monocrystalline C,N,S doped TiO₂ nanometer was prepared to improve its photocatalytic performance.The optimal calcination temperature was 400 ?,and the materials obtained had excellent photocatalytic performance,including RhB with a degradation efficiency of 96%,phenol with a degradation efficiency of 95%,Cr?VI?with a reduction efficiency of 96%,and hydrogen production efficiency of 158 mol h^-1 g^-1.