Multi-level trapped electrons system in enhancing photocatalytic activity of TiO2 nanosheets for simultaneous reduction of Cr (VI) and RhB degradation
Multi-level trapped electrons system in enhancing photocatalytic activity of TiO2 nanosheets for simultaneous reduction of Cr (VI) and RhB degradation
复制标题
多级俘获电子系统增强 TiO2 纳米片的光催化活性，同时减少 Cr (VI) 和 RhB 的降解
DOI：
10.1016/j.apsusc.2019.144298
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发表时间：
2020-02-15
影响因子：
6.7
通讯作者：
Fan, Jun
中科院分区：
文献类型：
--
作者：
Bai, Xue;Jia, Jia;Fan, Jun
这是我们首次报道了利用简单的水热法由赤磷（RP）和TiO_2纳米片制备P掺杂的纳米TiO_2，并伴随着表面物种的变化，即Ti ~（4+）、O ~（2-）、Ti ~（3+）、氧空位（V-O）和P ~（5+）。适量掺杂可诱导缺陷和杂质能级，促进电荷陷阱中心的形成或避免电荷复合中心的形成，从而显著提高光催化活性。利用紫外-可见光谱、光电光谱和TR-PL研究了光生载流子的吸收增强和传输性能。重要的是，Ti-O-P带的形成可以加速电子的传输，从而引起光生载流子的有效分离。据我们所知，Cr（VI）的减少和RhB的去除率，通过这种混合显示出比较有竞争力的其他报告。这一工作为在光催化剂上建立新的电子传输途径和更多的光催化反应中心提供了一种有前途的方法。
This is the first time we report that P-doped anatase titanium oxide (TiO2) nanosheets can be fabricated by red phosphorus (RP) and TiO2 nanosheets using simply hydrothermal method, accompanying variation in surface species viz. Ti4+, O-2, Ti3+, oxygen vacancies (V-o) and P5+. The defect and impurity levels induced by moderate doping could facilitate the formation of charge trap centers or avoid the formation of charge recombination centers, resulting in remarkably enhanced photocatalytic activity. Moreover, the enhanced optical absorbance and transfer performance of photo-generated carriers were studied using UV-Vis spectroscopy, photoelectric spectrometry and TR-PL. Importantly, the formation of Ti-O-P bands may accelerated transmission of electrons, giving rise to the effective separation of photo-generated carriers. To the best of our knowledge, the Cr (VI) reduction and RhB removal rate obtained by this hybrid show comparatively competitive among other reports so far. It is believed that this work provide a promising approach for building a novel pathway for electron transport and more photocatalytic reaction centers on photocatalysts.