Preparation And Properties Of Novel Photocatalytic Materials

TiO₂ is a classic semiconductor material.It has the advantages of low in price,easy to access,stability,non-polluting,etc.Graphene is an emerging carrier material with high electrical conductivity.If the two are combined,they can effectively promote the separation of photo-generated carriers,reduce the band gap and improve the photocatalytic activity.In this paper,a TNTs/rGO catalyst with nanotube structure is prepared by a concentrated alkali-hydrothermal method;A Ni-Co-TiO₂/rGO photocatalytic material with nickel-cobalt bimetal as the active component is prepared by displacement-hydrothermal method.The catalyst is characterized by TEM,XRD,BET and other testing methods.TNTs/rGO catalysts with pure graphene doped percentages of 0.5%,1%,1.5%,and2%and pure TNTs are prepared by the concentrated alkali-hydrothermal method.The effects of different doping percentages on the hydrogen production from TNTs/rGO catalysts by photocatalytic hydrolysis are studied.It can be seen from the experimental results that a certain amount of doping of graphene effectively improves the hydrogen production capacity of TiO₂ photocatalytic hydrolysis,and when the doping percentage is1.0%,the hydrogen production rate is three times that of pure TNTs materials.The results show that the introduction of graphene further increases the specific surface area of the catalyst,and improves the dispersibility and electron conduction efficiency of TiO₂nanotubes.Ni-Co-TiO₂/rGO nano-photocatalytic materials with a molar ratio of Ti to Ni-CO of1:3,1:2,and 1:1 are prepared by a hydrothermal method.Cyclic voltammetry is used to test the photocatalytic activity of methanol with different molar ratios.The experimental results show that when the molar ratio of the two is 1:2,the peak current density of the oxidation peak is 17.48mA?cm^-2,the initial potential of the oxidation peak is the lowest,and the catalytic activity is the strongest.The results show that TiO₂ is tightly wrapped on the surface of Ni-CO alloy balls,which can accelerate electron conduction and improve photocatalytic activity.