Condensation and photocatalytic degradation of environmental pollutants using hydrophobic mesoporous materials designed using F coating

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Using the F media the hydrophobic zeolite and mesoporous silica can be synthesized. These hydrophobic porous materials exhibit the high ability for the adsorption of organic compounds diluted in water and become the useful supports of photocatalyst. The hydrophobic Ti-Beta(F) zeolite prepared in the F- media exhibited highly efficiency than the hydrophilic Ti-Beta(OH) zeolite prepared in OH^<-> media for the liquid-phase photocatalytic degradation of 2-propanol diluted in water to produce CO_2 and H_2O. The TiO_2 loaded on the hydrophobic mesoporous silica HMS(F) (TiO_2/HMS(F)), which was synthesized using tetraethyl orthosilicate, tetraethylammonium fluoride as the source of the fluoride and dodecylamine as templates, also exhibited the efficient photocatalytic performance for the degradation. The amount of adsorption of 2-propanol and the photocatalytic reactivity for the degradation increased with increasing the content of fluoride ions on these photocatalysts. The efficient photocatalytic degradation of 2-propanol diluted in water on Ti-Beta (F) zeolite and TiO_2/HMS (F) mesoporous silica can be attributed to the larger affinity for the adsorption of propanol molecules on the titanium oxide species depending on the hydrophobic surface properties of these photocatalysts. We also propose a simple method to design highly hydrophobic zeolite through surface silylation using TEFS reagent and investigate the efficiency of this material as a support of TiO_2 photocatalyst.