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
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
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纳米TiO2修饰钛硅酸盐核壳结构的构建：可见光下高效氧活化降解罗丹明B且具有优异的回收性能
DOI：
10.1016/j.jece.2021.105815
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发表时间：
2021-06
影响因子：
7.7
通讯作者：
Zheng Zhanfeng
中科院分区：
文献类型：
--
作者：
Pei Linjuan;Gu Xianmo;Zhang Yantao;Wang Jie;Tan Hao;Wang Pengfei;Zheng Zhanfeng
为了提高TiO2的光催化性能并使其更易于回收利用，设计了钛硅酸盐@锐钛矿核壳微纳结构光催化剂。钛硅酸盐@锐钛矿核壳微纳米结构是通过两步法制备的：氢型钠钛矿的酸辅助水热处理和随后的煅烧。第一步，Ti物质的溶解和重结晶导致在钛硅酸盐上形成TiO2壳；第二步，煅烧不仅促进了Ti−O−Si键的形成，而且改善了TiO2壳的结晶。即使在 900°C 下也没有检测到金红石型 TiO2，这可能是由于 TiO2 纳米晶体与钛硅酸盐核之间通过界面处的 Ti−O−Si 键产生了强烈的相互作用。 Ti−O−Si 键的形成也改变了 TiO2 壳的表面特性，有利于催化剂周围 RhB 染料分子的富集，并诱导 O2•− 的快速产生。核与壳的协同作用使得RhB在可见光下快速降解并具有优异的回收性能。对核壳微纳米结构的生长动力学进行了详细研究，为制备易于回收的TiO2微纳米结构提供了一种新颖、简便的合成策略。
To improve the photocatalytic performance of TiO2and 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 TiO2shell 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 TiO2shell. The rutile TiO2was not detected even at 900 °C, which could be attributed to the strong interaction between TiO2nanocrystals 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 TiO2shell, 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 TiO2micro-nanostructure easy to be recycled.
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影响因子：
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作者：
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影响因子：
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