Preparation And Photocatalytic Of Hollow Boxes TiO₂ With Non-Metal And Metal Doped

As a one of the most well researched promising semiconductor photocatalytic star materials in recent ten years,TiO2 has been widely applied in the study field at present and real life,owing to its light utilization rate low(only absorb ultraviolet light),big forbidden band width,light generated carriers recombination rate high,limiting the widespread application in related fields of TiO2.Therefore,in this thesis,strategy for fabrication of TiO2 photocatalyst with enhanced photocatalytic activity was studied by N,S-codoped and Ti3+ self-doped and C doped/coated.The main research contents are as follows:Section 1: Due to its rich carbon and polyhydroxy aldehyde compound and donor electronic sugar molecules properties,the glucose was used to prepared C doped/coated TiO2 materials by one-pot hydrothermal.Explore the influence of hydrothermal temperature and C doping/coating amount for catalyst morphology and photocatalytic performance.Research results indicate that the hydrothermal temperature is too high,the structure of hollow nanoboxes is easy to collapse and broken,C doping/coating amount is lager lead to the catalyst obvious agglomeration.Therefore,the suitable temperature and doping/coating amount can improve photocatalytic activity of TiO2,the photodegradation rate constant of optimal catalyst(T24-0.15)is 2.4 times than TiO2.Section 2: N,S-co-doped hollow nanoboxes TiO2(denoted as TNS)photocatalytic materials was fabricated by calcination treatment of precursors TiOF2 at different temperature,and study the influence of temperature for TNS formation process.It was found that the phase transformation slows down of TiOF2 to anatase TiO2 after add methionine,and N,S-co-doped TiO2 showed obvious visible light photocatalytic activity.The TNS400 catalyst of photocatalytic degradation rate was studied,and its degradation rate and degradation rate constant were 1.5-2 times and 1.7-2 times respectively,compare with TiO2.Section 3: Ti3+ self-doped hollow nanoboxes TiO2 materials was synthesized by hydrothermal treatment the mixed ethanol solution of TiOF2 and zinc powder.This method prepared photocatalytic materials were found to show considerable visible light photocatalytic activity.The Ti3+/TiO2-0.25 catalyst was visible illumination 120 min and the degradation rate reach 96% and degradation rate constant was 1.9 times of TiO2.