Studies On CNTs' Adsorbing The Harmful Substances In The Fume Of Cigarettes And Improving The Photocatalytic Properties Of TiO₂

Carbon nanotubes (CNTs), have bee a hot spot in studies on fullerene since it was discovered. In this thesis, the study on the application of CNTs was reported briefly. Pore structure and specific surface area of CNTs, the application of absorption properties, such as gas storage, liquid infiltrate or staffer, and catalytic carrier,, have been stressed.In this thesis, the application of adsorption properties of CNTs were investigated. As adsorption materials, CNTs adsorbed the harmful substance of cigarettes; As the carrier of TiO2 photocatalyst, CNTs were added into TiO2 and made into CNTs-TiO2 compound photocatalyst to improve the photocatalytic ability of TiO2.In study on reducing the toxicity of cigarettes, the reagents, such as CNTs.activated carbon,NaCI,MgSO4,Al(OH)3,were put into normal filtertips to remove nicotine and tar from the fume of cigarettes, adsorption capacity of the reagents was evaluated by the method of weighing by difference. Removing effect of CNTs was most effective among the above reagents and removing effect of list processing CNTs was better than that of deep processing CNTs. Considering the removing rate and removing efficiency at different additional amounts of CNTsJOmg CNTs per cigarette was suggested because this amount could remove the harmful substance effectively and save cost at the same time.In study on TiO2 compound photocatalysts, activated carbon and CNTs were used as catalytic carriers in TiO2/A.C and CNTs-TiO2.The photocatalytic effects of these two compound photocatalysts were evaluated by photodegrading methamidophos.TiO2/A.C and CNTs-TiO2 were made by the method of sol-gel. A.C and CNTswere added and dispersed into the solution by ultrasound before gelate, then formed compound sol with magnetic stirring and mechanic stirring, mellowed into gel, rinsed and desiccated, activatively processed and we could get compound photocatalysts. From their TEM, nanoparticles of TiO2 were adhere to the surface of A. C and external wall of CNTs. The photocatalytic properties of compound photocatalysts were investigated. The data of degrading methamidophos of the concentration of 40.71 mg/L in the same condition showed that the photocatalytic effects of compound photocatalyst activated at 350?C were better than mechanical mixed TiO2 and A.C or TiO2 and CNTs. The apparent photodegradation rate constants of the former were 2.78 and 5.73 fold. The photocatalytic effect of a.c-containing(30wt%) TiO2/A.C activated at 500℃ was best. Photoactivity of CNTs-TiO2 was improved when the content of CNTs varied from 0% to 1%, and the appropricate activation temperature of CNTs-TiO2 was about 450℃.