Effect of acid during synthesis on the agglomerated strength of TiO2 nanoparticles
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Titanium dioxide (TiO2 or titania) photocatalyst nanoparticle (NPs) powders were prepared. The synthesis steps were performed at room temperature. Based on X-ray diffraction evidence, it was found that only the anatase structure was formed when hydrochloric acid was added during the synthesis. With no acid, both anatase and brookite structures were formed. Transmission electron microscopy (TEM) showed that the primary particles from both the acid and no-acid routes were of approximately the same size. A particle-size analyzer equipped with an ultrasonic generator showed, however, that the aggregates of acid NPs were more difficult to break apart than those of the no-acid NPs. Gel formation was used to explain the difference in strength by which the NPs aggregated.
Abstract
Titanium dioxide (TiO2 or titania) photocatalyst nanoparticle (NPs) powders were prepared. The synthesis steps were performed at room temperature. Based on X-ray diffraction evidence, it was found that only the anatase structure was formed when hydrochloric acid was added during the synthesis. With no acid, both anatase and brookite structures were formed. Transmission electron microscopy (TEM) showed that the primary particles from both the acid and no-acid routes were of approximately the same size. A particle-size analyzer equipped with an ultrasonic generator showed, however, that the aggregates of acid NPs were more difficult to break apart than those of the no-acid NPs. Gel formation was used to explain the difference in strength by which the NPs aggregated.
참고문헌 (14)
- S. Tsantilis, , Chem. Eng. Sci, 57, pp.2139~2156 (2002)
- M. Gopal, , J. Mater. Sci, 32, pp.6001~6008 (1997)
- C.J. Brinker, "Sol-Gel Science The Physics and Chemistry of Sol-Gel Processing", pp.21~43 (1990), Academic Press
- J. Livage, , Prog. Solid State Chem, 18, pp.259~341 (1988)
- S. Watson, , J. Nanopart. Res, 6, pp.193~207 (2004)
- J. Nikkanen, , J. Crystal Growth, 304, pp.179~183 (2007)
- H.C. Schwarzer, , Chem. Eng. Sci, 60, pp.11~25 (2005)
- S. Liufu, , J. Colloid Interface Sci, 281, pp.155~163 (2005)
- Sasiporn Sroiraya, "Kinetics and mechanism of hydroxyl radical formation studied via electron spin resonance for photocatalytic nanocrystalline titania: Effect of particle size distribution, concentration, and agglomeration", Journal of Ceramic Processing Research, 9(2), pp.146~154 (2008), 세라믹공정연구센터
- A.J. Maira, , Journal of Catalysis, 192, pp.185~196 (2000)
- I.N. Martyanov, , Journal of Catalysis, 225, pp.408~416 (2004)
- Z. Zhang, , J. Phys. Chem. B, 102, pp.10871~10878 (1998)
- H. Uchida, , Langmuir, 11, pp.3725~3729 (1995)
- S. Yodyingyong, , Journal of Catalysis (2008)