Study On The Degradation Of Formaldehyde In Car By Activated Carbon Fiber Loaded With Copper-doped BiVO₄ Composite Photocatalyst

With China’s sustained and rapid economic and social development,to maintain the high speed hinder growth,by the end of March 2017,the country has more than 200million vehicles for the first time,up to 200192782,accounting for 66.67%of the total motor vehicles.American AnnArbor environment group in view of the pollution of the environment inside the car of relevant studies have shown that the concentration of harmful substances in the air inside the car indoor environment of 5¹0 times,people in the car a long time,can feel the eyes,nose,throat uncomfortable,serious will feel fatigue,dizziness,headache,etc.Therefore,air pollution control is imperative.Photocatalytic technology has the advantages of low energy consumption,normal temperature and atmospheric pressure,high degradation efficiency,and many kinds of organic compounds.By the sun,photocatalysis oxide semiconductor materials to many organic pollutants into harmless small molecules,so the photocatalytic technology is very suitable for the purification of the air inside the car.Prepared by hydrothermal method of Cu doped BiVO₄ photocatalytic materials,through orthogonal test to determine the optimal preparation process parameters and process parameters according to the optimal scheme of the preparation of Cu-BiVO₄catalytic material,and were characterized by crystal phase and morphology analysis.According to the comparative analysis and experimental conditions,this paper finally adopted the powder sintering method to load Cu-BiVO₄ on activated carbon fiber.Finally,through the experimental design,combined with the actual situation,Cu-BiVO₄/ACF photocatalytic film was used for the degradation of formaldehyde in the vehicle,and the adsorption and degradation effect of Cu-BiVO₄/ACF photocatalytic film was studied.The study concluded that:（1）The optimum technological parameters of Cu-BiVO₄ catalyst were obtained by orthogonal test.They are,the hydrothermal temperature was 180℃,the Cu doping content was 1%,the pH value was 7 and the hydrothermal time was 8 h.Among them,the hydrothermal temperature and the Cu doping amount have a great influence on the catalytic activity of the catalyst.（2）X-ray diffraction（XRD）and scanning electron microscopy（SEM）show that Cu-BiVO4 powder is the best monoclinic system with better photocatalytic performance and higher crystallinity.And its particle size is small,about 26.26nm.What’s more,it is a quadrilateral granular,dispersed evenly,and the particles are evenly distributed on the surface with amorphous granules.（3）Based on the comparison between the load carrier and the load method and the actual application conditions,the paper finally selects the activated carbon fiber as the load matrix,and the powder sintering method is the load method.（4）In the design,the formaldehyde concentration in the car was tested by blank test,the ACF test and the arrangement of the Cu-BiVO₄/ACF test.Comparison shows that the arrangement of Cu-BiVO₄/ACF interior formaldehyde consistent decline in state,through the analysis of the initial stage of ACF to formaldehyde adsorption process is the main reason why the car formaldehyde concentration lower,with the adsorption time,the degradation of Cu-BiVO₄/ACF degradation plays a leading role to the car free formaldehyde,eventually in the test of time,the formaldehyde concentration of 0.37 mg/m³ dropped to 0.09 mg/m³,show that Cu-BiVO₄/ACF photocatalytic film has good catalytic degradation effect on the car formaldehyde.