Preparation And Application Of Sea Urchin-like Ag/N Doped Black Titanium Dioxide

In recent years,photocatalytic technology has shown broad application prospects in the treatment of environmental pollution and energy problems,and it has been widely studied.Among the most promising semiconductor photocatalyst,titanium dioxide?TiO₂?has been widely studied due to its nontoxicity,low price,mild reaction conditions and high chemical stability.However,TiO₂ has wide band gap energy?3.20eV?,it only absorbs ultraviolet light,while ultraviolet light that accounts for only 5%of the solar spectrum,which greatly limits its application in different fields.To solve these problems,the Ag/N-TiO_2-x is prepared by simple hydrothermal method and combined with a photo-deposition approach,followed by a reduction treatment.The crystal structure,morphology,properties and optical properties of the prepared samples are studied by XRD,Raman,SEM,TEM,XPS,UV-Vis and other characterization methods.Photocatalytic degradation of methyl orange and phenol are carried out under visible light.At the same time,the performance of photocatalytic hydrogen production from samples under simulated sunlight is explored and the photocatalytic mechanism is also proposed.The experimental results show that the N elements and Ti³⁺codoping could narrow the band gap,the optical absorption range of the catalyst is successfully extended to the visible light region and improve the photocatalytic performance,in addition,the as-prepared samples exhibit better photocatalytic activity due to surface plasmon resonance of silver nanoparticles.The photocatalytic degradation efficiency of methyl orange and phenol are 96.4%and 97.7%,respectively.At the same time,photocatalytic hydrogen evolution rate is 186.2 mol h^-1 g^-1,and after five cycles of hydrogen production test,hydrogen production activity of the samples did not decline,still has high stability.