Silver nanoparticles confined in shell-in-shell hollow TiO2 manifesting efficiently photocatalytic activity and stability
Silver nanoparticles confined in shell-in-shell hollow TiO2 manifesting efficiently photocatalytic activity and stability
复制标题
银纳米颗粒被限制在壳中壳空心二氧化钛中，表现出高效的光催化活性和稳定性
DOI：
10.1016/j.cej.2019.02.123
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发表时间：
2019-07-01
影响因子：
15.1
通讯作者：
Cao, Shunsheng
中科院分区：
文献类型：
--
作者：
Zhao, Shidong;Chen, Juanrong;Cao, Shunsheng
在模拟太阳光照射下，四环素的完全降解仍然是TiO2光催化剂面临的挑战。为了应对这一挑战，我们设计了限制在壳层中空的TiO2光催化剂(HTAT)中的银纳米颗粒(Ag NPs)。该策略主要包括CPS@Ti02核壳复合材料的构建、TiO2内壳的形成、AgNPs的光沉积负载、TiO2外壳的组装以及450℃焙烧得到的锐钛矿型TiO2光催化剂的相变。不出所料，在模拟太阳光照射下，HTAT光催化剂的两个壳层同时参与了四环素(TC和TCH)的光降解反应，从而实现了对四环素(TC和TCH)的完全降解。利用LC/MS对其转化中间体和降解途径进行了分析，有效地克服了以往报道的许多TiO2光催化剂对四环素不完全降解的缺点。
The complete degradation of tetracycline still is a challenge for TiO2-based photocatalysts under simulated solar light irradiation. To tackle this challenge, we devise Ag nanoparticles (Ag NPs) confined in shell-in-shell hollow TiO2 photocatalyst (HTAT). This strategy mainly involves the construction of CPS@TiO2 core-shell composites, the form of TiO2 inner shell, AgNPs loading by photo-deposition, the assembly of TiO2 outer shell, and phase transition of anatase TiO2 by calcination at 450 degrees C. All characterizations including TEM, STEM Mapping, BET, and XPS confirm the unique structure of the as-synthesized HTAT photocatalyst. As expected, the complete degradation of tetracycline (TC and TCH) can be realized by using HTAT photocatalyst under simulated solar light irradiation because its TiO2 two shells simultaneously take part in the photodegrading reaction of TC or TCH. The transformation intermediates and degradation pathway were analyzed by LC/MS. Our work effectively overcomes the disadvantages of many previously reported TiO2-based photocatalysts for the incomplete degradation of tetracycline.