Study On Loadability Of Kaolinite Surface To Photocatalyst

Nano-TiO₂ is capable of high chemical stability,high photocatalytic activity,safety etc.However,in the process of dealing with water pollution,the nano-TiO₂ particles are easy to agglomerate,causing the internal TiO₂ can not be fully utilized.At the same time,the separation and recovery of nano-TiO₂ in water is difficult,which may lead to secondary pollution.The clay mineral has large specific surface area and strong adsorption capacity.Therefore,the preparation of clay-based composite photocatalyst is an effective way to improve the photodegradation efficiency of TiO₂.The research content is as follows.Firstly,compared with halloysite and attapulgite,nano-TiO₂ was loaded on kaolinite investigate the photocatalytic performance.The results show that KT has the best performance in degrading methyl orange?MO?under simulated sunlight among TiO₂/kaolinite?KT?,TiO₂/halloysite?HT?and TiO₂/palygorskite?PT?.The degradation rate of KT Composite photocatalyst is 1.7 and 3.0 times as much as HT and PT,respectively,attributing to high loading efficiency and low agglomeration of TiO₂ on kaolinite surface and strong adsorption of MO anions on the surface of kaolinite.Secondly,kaolinite,with the best photocatalytic performance,was used to co-load TiO₂ and g-C₃N₄.And the optimal mass ratio of g-C₃N₄ was explored.Then the photocatalytic degradation mechanism of g-C₃N₄/TiO₂/Kaol was analyzed briefly.The photocatalytic performance of different rate photocatalytic was tested by degradation of the methylene blue.The results show that the photocatalyst loading of 0.5%g-C₃N₄had the best photocatalytic performance.In addition,the photocatalyst composite enhances the ability of capturing light and the efficient separation photogenerated electron-hole pairs.Finally,the kaolinite nanorolls were prepared by intercalation of kaolinite.In order to investigate the low loading of TiO₂ on kaolinite nanorolls,the intermediate intercalation product was loaded with TiO₂ to explore the effect of the intercalation process on the TiO₂ loading.The experiment results showed that the methanol and the cetanetrimethylammonium chloride?CTAC?have a negative effect on the TiO₂ loading.