Study Of ACF/TiO₂as Packaging Photocatalytic Composite Materials

This article mainly discusses wooden activated carbon fibers are prepared using Chinese Fir (Cunninghamia Lanceolata) as raw material, by phenol liquefaction technology, melt spinning, as well as curing and activation using CO2, and with activated carbon fibers as the support, activated carbon fibers loaded nano-TiO2(ACF/TiO2) photocatalytic material is obtained by sol-gel method. The effects of activation temperature, activation time, and flow rate of CO2on iodine adsorption properties and the yield rate under different activation temperatures are studied, the field emission SEM, XRD, Raman, BET analyzer to investigate the characteristics of activated carbon fibers. The effects of alcohol, deionized water, dip-coating time, TiO2impregnation solution concentration on loading rate of nano-TiO2are studied. And the effects of calcination temperature, calcination time, heating rate, illumination time under different calcination temperatures on the degradation rate of ACF/TiO2for methylene blue (MB) and the loading rate of nano-TiO2under different calcination temperatures are also investigated. The characteristics are analyzed by SEM, XRD, FTIR, XPS. Finally, we discuss several factors on degradation rate of formaldehyde gas with ACF/TiO2were studied. The main conclusions are presented as follows:(1) With increasing activation temperature and flow rate of CO2, the iodine adsorption of wooden activated carbon fibers gradually increase, but the yield rate is decreasing with increasing activation temperature. The iodine adsorption of activated carbon fibers is found to be maximum at the activation time40min and then fall. With increasing activation temperature, internal microcode structure tends to be ordered. Activated carbon fibers mainly have micropores as well as a few macro-and mesopores, and micropore rate reaches90%. The micropore diameter of activated carbon fibers has a narrow distribution (0.3to0.5um).(2) The loading rate of nano-TiO2increases with decreasing deionized water and increasing nano-TiO2impregnation solution concentration; the loading rate of nano-TiO2initially increases and then decreases with increasing alcohol content and dip-coating time, but the dip-coating time only has weak influence on the loading rate of nano-TiO2.(3) With increasing heating rate and calcination time, the degradation rate of MB of ACF/TiO2gradually increases, but calcination time has little effect on degradation rate of MB. The degradation rate of ACF/TiO2on MB improves with the extension of UV lighting time, and the degradation rate of MB reaches the best at450℃. The molecule structures and the functional groups of activated carbon fibers and ACF/TiO2have significant changes, the characteristic adsorption peaks of TiO2emerged at1402and471cm-1on the infrared spectrum of ACF/TiO2It proves that TiO2is well loaded on the surface of wood activated carbon fibers. With increasing calcination temperature, the contents of elements Ti and Ti-O bond of lattice oxygen on the surface of ACF/TiO2increase and then decrease.(4) With increasing lighting time, ACF/TiO2doses and initial formaldehyde concentration, the degradation rate of formaldehyde gradually increases. With increasing loading rate of nano-TiO2, the degradation rate of formaldehyde first increases and then decreases.