Preparation Of Hollow Spheres Modified TiO₂ Biological Carbon Dots And Their Photocatalytic Properties For Rapid Reduction Of Cr（Ⅵ） In Water Under Pristine PH

Environmental pollution,ecological imbalance,shortage of resources and energy crisis seriously restrict the comprehensive,coordinated and sustainable development of our society and economy.semiconductor photocatalysts convert solar energy into the chemical energy that people need by using the redox properties of their own photogenerated electron holes to realize the degradation of pollutants and the preparation of clean energy.it is a low-cost,high-efficiency and environmentally friendly the treatment of pollutants,which has great application prospects.It is of great significance to use biomass energy to assist the preparation of photocatalytic materials with remarkable effect.But common photocatalysts such as TiO₂ have large band-free width and no visible light activity,and the photogenerated electron holes are easy to recombine.Most of the catalytic reactions show high catalytic activity under strong acid conditions.Acid addition in the catalytic system is easy to introduce new pollutants,resulting in secondary pollution.In this paper,the preparation of the quantum dot C load of TiO₂ hollow ball（TiO₂-HMSs-CDs）without having to adjust pH reaction solution,can be in neutral condition efficient reductive hexavalent chromium in water and adsorption on the catalyst reach the purpose of completely removing hexavalent chromium,and explore its photocatalytic mechanism of the system and improve activity of the main research content is as follows:Hydrothermal carbon sphere precipitate with good morphology and uniform dispersion,and upper carbon quantum dot solution were prepared by simple hydrothermal method using resorcinol as regulator using locally common abandoned olean fruit shell as raw material.Titanium dioxide hollow spheres with good morphology and high crystallinity were prepared by using hydrothermal carbon spheres as templates,using tetrabutyl titanate as titanium source,stirring at simple room temperature and calcining at high temperature to remove carbon spheres.The structure of good morphology increases the specific surface area and enriches the active sites.The c element in the c sphere template and tetrabutyl titanate and the single n element in ammonia water doped TiO₂ at the atomic level to form lattice defects,enhance the separation and transfer of photogenerated electrons,and greatly improve the catalytic activity of the material.The TiO₂-HMSs-CDs with high catalytic activity were further prepared by stirring the upper carbon qds onto the surface of the titanium dioxide hollow spheres.xrd,tem,eds and xps were used to characterize the morphology and structure,composition and structure,optoelectronic properties and so on.C quantum dots on the surface of the material as a sacrificial agent for adsorbing metals in the contaminated solution and for exporting photogenerated electrons to the surface of the material.Finally,the material was used for the reduction of hexavalent chromium under neutral conditions,showing ultrahigh catalytic activity and further exploring its catalytic reduction mechanism.