Study On The Microstructure Material ?InVO₄/TiO₂,Pt-InVO₄/TiO₂? With Photothermocatalytic Effect And Hydrogen Production From Water-splitting

Since Fujishima and Honda reported their discovery on Nature that water can be decomposed to produce H2 with the using of TiO2 semiconductor electrode and metal electrode irradiated by light,photocatalytic technology has attracted lots of attention during forty years.It was realized that light energy can be combined with other energy to improve the utilization efficiency of the catalysts.The study on the photothermal synergetic effect will be able to solve the problems of the modern global energy depletion and the low energy efficiency.As a kind of semiconductor which can be responded to visible light,InVO4 helps the traditional photocatalytic material TiO2 broadening the absorption spectrum about 130 nm,raising the utilization rate of solar energy,realizing the efficient separation of photo-generated carriers in space,and reducing their recombination.Most importantly,it was found that the composite photocatalyst InVO4/TiO2 has a photothermocatalytic effect,which can degrade benzene at the low temperature of 180 ?,and the synergetic efficiency is 12.5%higher than the sum of single photocatalysis and thermocatalysis.In order to further optimize the photocatalytic performance,InVO4/TiO2 was loaded with the noble metal Pt.The new composite Pt-InVO4/TiO2 greatly lowered the temperature to 80 ? at which benzene could be completely degraded,and at the same time,it strengthened the photothermocatalytic synergetic effect of the catalytic system,with the efficiency of 90%higher than the sum of single photocatalysis and thermocatalysis.In addition,the ability of photocatalytic water-splitting over Pt-InVO4/TiO2 was studied to dig out its potential in photocatalytic application area.After a series of experiments,the reaction conductions were optimized and the yield of hydrogen could be as high as 1263 ?mol/g.The innovative points of this paper are as below:(1)The photothermocatalytic effect of InVO4/TiO2 without noble metal doping was discovered for the first time.Benzene could be totally degraded at the temperature of 180 ?,and it is much lower than the one in industrial thermal catalytic reactions.(2)The temperature at which benzene can be totally degraded was greatly lowered to 80 ? after the microscale doping of Pt onto InVO4/TiO2.The synergetic efficiency of Pt-InVO4/TiO2 is about 7.2 times of InVO4/TiO2.(3)The performance of the composite catalyst Pt-InVO4/TiO2 in photocatalytic water-splitting was studied for the first time.The reaction conditions were optimized,and the yield of hydrogen could as high as 1263 ?mol/g in four hours.