Preparation And Photocatalytic Performance Of Doped Modified Strontium Titanate

In order to meet social progress and people's needs,excessive use of fossil fuels leads to energy consumption and environmental pollution.Among them,the rapid increase in CO₂ concentration caused serious greenhouse effect,which threatens the survival of mankind.However,CO₂,as a carbon source for chemical synthesis and fuel production,has received widespread attention.Therefore,the forth putting of green and sustainable photo-catalytic reduction of CO₂ technology and of CO₂ as a raw material and convert it into hydrocarbons such as CO or CH₄,so effectively solve environmental and energy problems.SrTiO₃ photocatalytic materials have certain advantages in the photocatalytic reduction of CO₂ due to its unique energy band structure,but its wide band gap of characteristics limits its application.Therefore,for the key scientific issues such as poor separation of photo generated charge and weak surface catalytic ability of SrTiO₃,it was modified by surface modification based on the boric acid salt,rare earth Er³⁺doping and B doping to improve its photo-induced charge separation and give it a surface catalytic effect,and further study its photo catalytic reduction of CO₂performance and mechanism.The main research content is as follows:?1?SrTiO₃ nanocrystals were prepared by solvothermal-calcination method,and SrTiO₃ was surface-modified with borate.The resulting borate-modified SrTiO₃photocatalyst has higher reduced CO₂ activity.The results of hydroxyl radical and electrochemical measurements show that borate is successfully modified on the surface of the material,which is beneficial to the separation of photogenerated electrons and holes.The electrochemical reduction CO₂ test results show that borate-modified SrTiO₃enhance the catalytic ability of the surface to CO₂,thereby improving the photocatalytic reduction of CO₂ activity.?2?Er³⁺doped SrTiO₃ was prepared by solvothermal and calcination method.Using a series of basic characterization methods confirmed the Er³⁺doping did not change the structure and morphology of the samples.In addition,hydroxyl radical tests,photoluminescence spectra and other test results show that Er³⁺doping is conducive to improve the light absorption of the sample and enhance the catalytic ability of the surface to CO₂,thereby improving the photocatalytic reduction CO₂ activity.?3?TiB₂ was used as a special B source and Ti source and B doped SrTiO₃ was successfully prepared by solid phase method.A series of test results confirm that the sample is a layered polyhedron structure.It is also shown that B doping is beneficial to expand the visible light,increase the charge separation and enhance the adsorption and catalytic activity of SrTiO₃ on the CO₂ surface,thus improving the photocatalytic reduction of CO₂ activity.