Study On The Adsorption And Photocatalysis Behavior Of The Adsorption/Photocatalysis Coupling Regular Photocatalyst

By controlling the preparation conditions such as the resin/carbon ratios, carbonization temperature and activation temperature, the regular carbide supports were prepared, by which the raw meaterial was activated carbon powder and the binder was phenolic resin. Adsorption/photocatalysis coupling regular photocatalysts had the better Shape, which was prepared by direct dip-coating method.The properties of the regular photocatalysts were characterized by means of BET, XRD and SEM techniques.The results analyzed by BET and pore structure showed that the regular photocatalysts had higher specific surface area and lots of mesopore. The results analyzed by XRD showed that the regular carbide supports were amorphism and the titanium dioxide(TiO₂)maintained at anatase crystal.The results analyzed by SEM showed that the regular photocatalysts had developed complex pore structure and been loaded a large amount of TiO₂。The homemade reaction and desorption evaluation device was used to study the preparation conditions'influence on the adsorption rate and the absolute removal rate of benzene on the adsorption/photocatalysis coupling regular photocatalyst.Because of the high adsorption rate, the apparent removal rate could achieve 100 percent in a short time. Among the rifely high absolute removal rate, the highest absolute removal rate was 72.63%, when the resin/carbon ratio was 0.8 to 1 , carbonization and activation temperature were 600oC.In order to study the desorption capability of the whole regular photocatalysts, the temperature programmed desorption(TPD)technology was introduced. The results showed that the lowest desorption activation energy of benzene was 28.03kJ/mol, when the resin/carbon ratio was 0.8 to 1, carbonization and activation temperature were 600oC.In this condition,there was the lowest interaction power between benzene and the regular photocatalyst after the adsorption.Benzene molecule would be more easily to move to the exterior of the regular photocatalyst and to desorb.By considering characterization and evaluation results, the best conditions of preparation was that the resin/carbon ratio was 0.8 to 1, carbonization temperature was 600oC and activation temperature was 600oC.