Construction of nano-TiO2 decorated titanosilicate core-shell structure: Highly efficient oxygen activation for the degradation of Rhodamine B under visible light and excellent recycling performance. Issue 5 (October 2021)

• Record Type: Journal Article
• Authors: Pei, Linjuan; Gu, Xianmo; Zhang, Yantao; Wang, Jie; Tan, Hao; Wang, Pengfei; Zheng, Zhanfeng
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 5(2021)
• Publication Date: 2021-10
• Subjects: Titanosilicate@anatase core-shell structure -- O2 molecules activation -- Catalyst sedimentation -- Photocatalytic degradation of Rhodamine B; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.105815
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: To improve the photocatalytic performance of TiO2 and make it easier to recycle, the titanosilicate@anatase core-shell micro-nanostructure photocatalysts were designed. The titanosilicate@anatase core-shell micro-nanostructure was fabricated by a two-step method: an acid-assisted hydrothermal treatment of the hydrogen-form natisite and a subsequent calcination. In the first step, the dissolution and recrystallization of Ti species led to the formation of TiO2 shell over the titanosilicate; in the second step, the calcination not only facilitated the formation of Ti−O−Si bond, but also improved the crystallization of TiO2 shell. The rutile TiO2 was not detected even at 900 °C, which could be attributed to the strong interaction between TiO2 nanocrystals and the titanosilicate core through Ti−O−Si bond at the interface. The formation of Ti−O−Si bond also changed the surface characteristic of the TiO2 shell, which facilitated the enrichment of RhB dye molecules around the catalyst and induced the fast production of the O2 − . The collaboration of the core and the shell contributed to the quick degradation of RhB under visible light and the excellent recycling performance. The growth kinetics of the core-shell micro-nanostructure has been studied in detail, which provided a novel and facile synthesis strategy for the fabrication of TiO2 micro-nanostructure easy to be recycled. Graphical Abstract: ga1 Highlights: The core-shell structure was still stable even at 900 °C. The collaboration of the core and the shell facilitated the degradation of RhB. The RhB degradation pathway can be changed by the addition of L -Ascorbic Acid. The rapid sedimentation of the structure was suitable for practical use. This approach was applicable to other titanosilicate materials such as ETS-4.