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제안 방법
- In order to study the performance of photocatalytic activity of core@shell NPs, degradation of dye molecules was employed and monitored as model reaction. We prepared 10 ppm methylene blue (MB) solution by dissolving 10 mg powder in 1000 mL of distilled water.
- The morphology of core@shell NPs was investigated using a JEOL JSM-6700F SEM micro-scope. TEM and SAED measurements were carried out on a JEOL JSM2100-F microscope operated at 100 kV. UV-vis absorbance spectra were obtained using a Sinco S-4100 spectrometer.
대상 데이터
- and are of analytical reagent grade. Tetraethylorthosilicate (TEOS), absolute ethanol, and aqueous ammonia solution (28 wt %) were purchased from Sigma Aldrich (Korea). TiO2 (P25, 80% anatase, mean size of ~25 nm) and ZnO (BYK- 3840 Wrutzite, mean size of ~25 nm) was purchased from Degussa (Germany) and BYK (USA).
- We mixed 2 mg of catalyst with 30 mL of MB in a quartz container and sonicated for 10 min to get a uniform dispersion. The samples were irradiated under stirring by a UV (Newport Co., model 66984) light source. UV-vis absorbance spectroscopy (Varian Cary 5000 UV-vis-NIR spectrophotometer) was used to record the change in absorbance maxima of the characteristic peaks of dye molecules.
- Tetraethylorthosilicate (TEOS), absolute ethanol, and aqueous ammonia solution (28 wt %) were purchased from Sigma Aldrich (Korea). TiO2 (P25, 80% anatase, mean size of ~25 nm) and ZnO (BYK- 3840 Wrutzite, mean size of ~25 nm) was purchased from Degussa (Germany) and BYK (USA). All these reagents were used as received.
이론/모형
- In this study, moderately well dispersed TiO2@SiO2 and ZnO@SiO2 composite NPs were successfully prepared using a simple sol-gel method. This method does not require any sophisticated reactants or any additional steps to purify the product unlike in the case of reverse microemulsion technique.
- Rutile type TiO2 NPs was prepared by heating anatase TiO2 at 600 ℃ for 4 h in air. SiO2 shell coating over TiO2 and ZnO was achieved by a sol-gel method. In a typical sol-gel method, about 0.
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