Structural, textural and photocatalytic properties of quantum-sized In2S3-sensitized Ti-MCM-41 prepared by ion-exchange and sulfidation methods
✍ Scribed by Shaohua Shen; Liejin Guo
- Publisher
- Elsevier Science
- Year
- 2006
- Tongue
- English
- Weight
- 332 KB
- Volume
- 179
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
In 2 S 3 nanocrystallites were successfully encapsulated into the mesopores of Ti-MCM-41 by a two-step method involving ion-exchange and sulfidation. The X-ray diffraction (XRD) patterns, UV-vis absorption spectra (UV-Vis), high-resolution transmission electron microscopy (HRTEM) and N 2 adsorption-desorption isotherms were used to characterize the structure of the composite materials. It is found that the diameter of most In 2 S 3 nanocrystallites is about 2.5 nm, less than the pore size of Ti-MCM-41. The In 2 S 3 nanocrystallites inside the Ti-MCM-41 host show a significant blue-shift in the UV-vis absorption spectra. Under irradiation of visible light (l4430 nm), the composite material has much higher photocatalytic activity for hydrogen evolution than bulk In 2 S 3 . It can be explained by the effective charge-separation in the quantum-sized In 2 S 3 -sensitized Ti-MCM-41.