Abstract
The new and simple approach for deposition of catalytically active TiO2coating on carbon monolith (CM) carrier was presented. CM photocatalysts were impregnated with TiO2using titanium solution and thermal treatment, and their photocatalytic activity was investigated in the process of methylene blue (MB) photodegradation. For the purpose of comparison, CM composite photocatalysts were prepared by dip-coating method, which implies binder usage. The presence of TiO2on CM carrier was confirmed by Raman spectroscopy and scanning electron microscopy. The sorption characteristics of CM and the role of adsorption in the overall process of MB removal were evaluated through amount of surface oxygen groups obtained by temperature-programmed desorption and specific surface area determined by BET method. CM has shown good adsorption properties toward MB due to high amount of surface oxygen groups and relatively high specific surface area. It was concluded that photocatalytic activity increases with CM disc thickness due to increase of MB adsorption and amount of deposited TiO2. Good photocatalytic activity achieved for samples obtained by thermal treatment is the result of better accessibility of MB solution to the TiO2particles induced by binder absence.
Highlights
Nowadays, the mobilization of pollutants in the environment becomes a serious concern due to the increased industrial activities and effluents discharge into environment
carbon monolith (CM) photocatalysts were impregnated with TiO2 using titanium solution and thermal treatment, and their photocatalytic activity was investigated in the process of methylene blue (MB) photodegradation
Good photocatalytic activity achieved for samples obtained by thermal treatment is the result of better accessibility of MB solution to the TiO2 particles induced by binder absence
Summary
The mobilization of pollutants in the environment becomes a serious concern due to the increased industrial activities and effluents discharge into environment. Catalysts obtained in this way show good photocatalytic activity, sol-gel method represents a time consuming process, which is its main disadvantage. Another group of methods for loading the TiO2 particles on carbon material carrier implies TiO2 deposition from gas phase. Unlike the already mentioned complicated methods TiO2 particles could be loaded to the carbon material surface by cheap and simple dip-coating method [6]. The attempt was made to develop a simple and cheap method for obtaining firmly attached photocatalytically active TiO2 coating on carbon material without using a binder. Photocatalytic activity of obtained samples was examined by photodegradation of methylene blue in the flow system
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