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

利用F介质可以合成疏水沸石和介孔二氧化硅。这些疏水多孔材料对水中稀释的有机化合物具有很高的吸附能力，成为光催化剂的有效载体。在F-介质中制备的疏水ti - β (F)沸石比在OH^<->介质中制备的亲水ti - β (OH)沸石在液相光催化降解水中稀释的2-丙醇生成CO_2和H_2O的效率更高。以正硅酸四乙酯、四乙基氟化铵和十二烷基胺为模板剂合成的疏水介孔二氧化硅HMS(F) （TiO_2/HMS(F)）负载TiO_2也表现出了高效的光催化降解性能。随着氟离子含量的增加，2-丙醇的吸附量和降解的光催化活性均有所提高。ti - β (F)分子筛和TiO_2/HMS (F)介孔二氧化硅对水中稀释的2-丙醇的有效光催化降解可以归因于这些光催化剂的疏水表面性质对丙醇分子在氧化钛上的吸附具有较大的亲和力。我们还提出了一种用TEFS试剂通过表面硅基化来设计高疏水沸石的简单方法，并考察了该材料作为TiO_2光催化剂载体的效率。

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.