Potassium fluoride,anhydrous
           Potassium fluoride,extra pure
           Potassium fluoride,Granular
           Silicon Dioxide
           Hydrofluoric acid
           Synthetic Cryolite
           Potassium Fluoaluminate
           Ammonium bifluoride
           Potassium Bifluoride
           Aluminium fluoride
           Sodium fluoride
           Potassium Fluorosilicate
           Fluorosilicic Acid
           Sodium silicofluoride
           Potassium Hydroxide Flakes
           Magnesium Fluoride
           Magnesium fluorosilicate
           Barium Fluoride
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Treatment with Hydrofluoric acid solution removes the impurities that inhibit photocatalysis, which still requires further exploration. Anatase TiO2 nanocaps obtained by this method exhibited high photocatalytic performance. The other reasons can be summarized as following four aspects: (i) anatase TiO2 nanocaps has open hole and this unique structure is conducive to the full use of incident light, (ii) the crystal structure of anatase phase is morebeneficial for the photocatalysis, (iii) after etching process, increased specific surface area creates more active sites to absorb dye molecules.

Hydrofluoric acid(HF) assisted chemical etching process is simple, fast, and effective. The obtained hollow anatase TiO2 nanocaps due to the unique hemispherical structure exhibits high photocatalytic activity, which photocatalytic degradation rate for RhB under UV light is far more than that of commercial P25 and the TiO2 nanostructures etched by NaOH-assisted etching. This method may utilizable for other photocatalytic materials. In summary, we have developed a feasible method to prepare anatase TiO2 nanocaps, and we also explored the effect of calcination temperature and etchant amounts on the degradation of RhB dye. The optimal calcination temperature (e.g., 700 ℃) and HF amount (e.g., 0.2 mL) make anatase TiO2 nanocaps with excellent photocatalytic performance.

Hydrofluoric acid assisted chemical etching process.As far as we know, expanding the range of light response of TiO2 is an important research to broaden its field of application. Deposition of noble metal on surface of TiO2 catalysts is an effective means to improve the photocatalytic performance under visible-light. Herein, sample EST-3 was modified with 0.7 wt% Au NPs (Au@EST). To identify the influence of Au NPs on absorbance property. Compared with sample EST-3 whose absorption is only in the UV light region, a distinct wide absorption band at ca. 550 nm was observed for Au@EST, which indicated a certain absorption in the visible range. This modified absorption in the visible light range is attributed to the surface plasmon resonance (SPR) of Au NPs. Au NPs broaden the optical response range of anatase TiO2 nanocaps; On the other hand, it promote the separation of photo-generated electron-hole pairs. Therefore, photocatalytic degradation of RhB under visible light has been improved.