Study On Au-Cu Alloy,CeO₂ And TiO₂ Nanorods Modified TiO₂ Nano Hollow Boxs And Its Performance

Among all the catalytic materials,TiO₂ is considered to be the most promising semiconductor catalyst because of its unique photoelectric characteristics,high catalytic activity,non-toxicity,stable photochemical properties,and low cost.However,the disadvantages of low visible light utilization rate,rapid recombination of photogenerated carriers（e^-/h⁺）,large band gap（3.2 e V for anatase TiO₂）and low quantum efficiency hindered the practical application of TiO₂ catalysis.Therefore,to make up for the defects of TiO₂ and improve its catalytic performance is a subject of great research significance.In order to solve the above-mentioned problems,the surface modification of the Ti O2 nano hollow boxs were carried out by metal deposition,semiconductor compounding and construction of surface heterojunction.Three new types of nano-catalyst materials were prepared,and their photocatalytic activity and adsorption performance were studied.First,the precursor Ti OF₂ was prepared by solvothermal method,and then the TiO₂ nano hollow boxs（THB）was prepared by hydrothermal method and calcination method.THB was modified by Au-Cu alloy deposition,CeO₂composite and TiO₂ nanorod growth,and their photocatalytic and adsorption properties were studied.And the possible reaction mechanism was speculated.The main research contents of the paper are as follows:First,using HAuCl₄ and anhydrous CuSO₄ as raw materials,Au-Cu alloys with different mass ratios were successfully deposited on the surface of TiO₂ nano hollow boxs（Au-Cu/THB）by deposition precipitation method,and the photocatalytic and adsorption properties of organic dyes were studied.The results show that the photocatalytic activity and adsorption performance of Au-Cu/THB were greatly improved.Among them,under simulated sunlight,the catalyst Au-Cu4:3/THB indicated the photodegradation rate of Rh B was up to 99.4%in 150 minutes,which was3.0 times that of THB.Moreover,the Rh B adsorption rate of the catalyst Au-Cu4:3/THB was 98.6%which was 6.1 times higher than that of THB.Au-Cu/THB catalyst has good selective adsorption for cationic dyes.Second,using tetrabutyl titanate and Ce（NO₃）₃·6H₂O as raw materials,through the calcination method and the impregnation method,CeO₂ and TiO₂ nano hollow boxs composite catalytic material（CeO₂-THB）was prepared and carried out,and its characterization and photocatalytic performance were tested.The experimental results show that under simulated sunlight,when the content of Ce（NO₃）₃·6H₂O was 3%,the efficiency of photocatalytic degradation of Rh B by catalyst 3%CeO₂-THB within 120min is about 88%,which is about 4.4 times that of pure THB.This shows that the combination of CeO₂ and THB can effectively improve the photocatalytic performance.Third,using tetrabutyl titanate and oleic acid as raw materials,TiO₂ nanorods were grown on the surface of the TiO₂ nano hollow box with highly exposed{001}surface by the seed growth method,and the TiO₂ nanorods and TiO₂ nano hollow boxes catalyst（TN-THB）were obtained,and tested its photocatalytic performance.The experimental results show that under simulated sunlight,the degradation rate of Rh B photocatalytic degradation of TN1.00-THB is about 99.9%in 90 minutes compared with THB.This indicated that the growth of TiO₂ nanorods greatly improves the photocatalytic activity of TiO₂ nano hollow boxs.