Preparation and characterization of SiO 2-pillared H 2Ti 4O 9 and its photocatalytic activity for methylene blue degradation
Abstract
SiO 2 pillared layered titanate (SiO 2–H 2Ti 4O 9) was prepared via intercalating organosilanes into the interlayers of the layered K 2Ti 4O 9 followed by calcination at 500 °C. The resulting materials were characterized using XRD, N 2 adsorption–desorption isotherms, UV–vis spectra, IR spectroscopy and Raman spectroscopy. The photocatalytic activity of SiO 2–H 2Ti 4O 9 was evaluated by photocatalytic degradation of aqueous methylene blue dye (MB). XRD and specific surface area results showed that SiO 2–H 2Ti 4O 9 had an interlayer distance of 1.45 nm and a specific surface area of 148 m 2 g ‑1. UV–vis absorption spectrum of SiO 2–H 2Ti 4O 9 showed a red shift, indicative of a narrower band gap compared to K 2Ti 4O 9. In addition, SiO 2–H 2Ti 4O 9 showed higher MB adsorption capacity compared to H 2Ti 4O 9 and K 2Ti 4O 9. MB photodegradation over H 2Ti 4O 9, K 2Ti 4O 9 and SiO 2–K 2Ti 4O 9 followed zero-order kinetics under our experimental conditions, and the photocatalytic activity of SiO 2–H 2Ti 4O 9 was found to be three times higher than that of K 2Ti 4O 9, which could be attributed to the increase of interlayer space and specific surface area of SiO 2-pillared layered titanate.
- Publication:
-
Journal of Hazardous Materials
- Pub Date:
- January 2009
- DOI:
- 10.1016/j.jhazmat.2008.09.045
- Bibcode:
- 2009JHzM..164.1250J
- Keywords:
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- Pillared layered compounds;
- Photocatalysis;
- Methylene blue photodegradation