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Celastrol-modified TiO₂ nanoparticles: effects of celastrol on the particle size and visible-light photocatalytic activity

Chen, Caihua, Liu, Quanwen, Gao, Shanmin, Li, Kai, Xu, Hui, Lou, Zaizhu, Huang, Baibiao, Dai, Ying
RSC advances 2014 v.4 no.24 pp. 12098-12104
Tripterygium wilfordii, crystal structure, hot water treatment, kinetics, light, medicinal plants, methylene blue, nanoparticles, particle size, photocatalysis, photosynthesis, pigments, titanium dioxide, triterpenoids
In this study, celastrol (CSL), a triterpene compound which is derived from the Chinese medicinal plant Tripterygium wilfordii, was used to synthesize CSL-modified TiO₂ nanoparticles by a hydrothermal treatment method. The nanoparticles phase, morphology, surface structures, as well as the visible-light photocatalytic activities were studied. The modification of CSL does not alter the crystalline structure of the TiO₂ but can prevent TiO₂ from further aggregating and provides photosynthesis pigments as an in situ dye-sensitizing source. Compared to pure TiO₂, the resulting CSL-modified TiO₂ nanoparticles exhibit enhanced visible-light photocatalytic activity and showed an excellent cyclic stability in the decomposition of methylene blue (MB). In addition, the photocatalytic degradations of MB were all demonstrated to follow a first-order kinetic model. The enlarged specific surface area and CSL-modified surface improved the visible-light photocatalytic activity of nanoparticles.