Ultra-small subnano TiOx clusters as excellent cocatalysts for the photocatalytic degradation of tetracycline on plasmonic Ag/AgCl†,Catalysis Science & Technology

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Ultra-small subnano TiOx clusters as excellent cocatalysts for the photocatalytic degradation of tetracycline on plasmonic Ag/AgCl†
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2019-10-30 , DOI: 10.1039/c9cy01876j
Wenlu He _{1,

2,

3,

4} , Kaiwen Wang _{4,

5,

6,

7} , Zhu Zhu _{4,

5,

6,

7} , Hanjun Zou _{2,

3,

4,

8} , Kai Zhou _{2,

3,

4,

8} , Zhao Hu _{4,

9,

10,

11} , Youyu Duan _{1,

2,

3,

4} , Yajie Feng _{1,

2,

3,

4} , Liyong Gan _{1,

2,

3,

4} , Kangle Lv _{4,

9,

10,

11} , Cong Wang _{4,

5,

6,

7} , Xiaodong Han _{4,

5,

6,

7} , Xiaoyuan Zhou _{1,

2,

3,

4,

8}

Affiliation

The separation efficiency and recombination rate of photogenerated electron–hole pairs play a vital role in photocatalytic activity. We report the incorporation of ultra-small subnano TiO_x clusters as outstanding cocatalysts on the surface of plasmonic Ag/AgCl to boost the simulated sunlight photoreactivity. The formed structure is in favour of an efficient photoinduced electron–hole transfer process and suppressing the recombination rate, yielding an enhanced photocatalytic activity. The experimental results show that TiO_x@Ag/AgCl exhibits an extraordinarily high activity in the photodegradation of tetracycline (TC) under simulated sunlight irradiation, which is about 21.7 times higher than that of bare Ag/AgCl. Their corresponding apparent quantum efficiency (AQE) is up to 0.917% at 435 nm and 17.459% at 350 nm during the photodegradation of TC, respectively. Moreover, TiO_x@Ag/AgCl shows an outstanding long-term stability without obvious performance loss even after ten cycles of photodegradation. The possible enhancement mechanism of the reaction rate is proposed based on the compositional, structural, and optical property analysis. We found that h⁺ was the major reactive species in the photodegradation process of TC. Our findings on ultra-small TiO_x cocatalysts would shed light on the design and development of highly efficient oxide cluster cocatalysts.

中文翻译：

超小型亚纳米TiO _x簇是极好的助催化剂，可在等离子体Ag / AgCl上光催化降解四环素†

光生电子-空穴对的分离效率和复合率在光催化活性中起着至关重要的作用。我们报告了超小型亚纳米TiO _x团簇的掺入，作为等离激元Ag / AgCl表面上的杰出助催化剂，以提高模拟的阳光光反应性。形成的结构有利于有效的光致电子-空穴转移过程，并抑制了复合速率，从而增强了光催化活性。实验结果表明，TiO _x在模拟阳光照射下，@ Ag / AgCl在四环素（TC）的光降解中表现出异常高的活性，比裸Ag / AgCl高约21.7倍。在TC的光降解过程中，它们相应的表观量子效率（AQE）在435 nm处高达0.917％，在350 nm处高达17.459％。此外，TiO _x @ Ag / AgCl即使在十次光降解循环后仍显示出优异的长期稳定性，而没有明显的性能损失。基于组成，结构和光学性质分析，提出了反应速率可能的增强机理。我们发现h ⁺是TC光降解过程中的主要反应物种。我们对超小型TiO _x的发现助催化剂将阐明高效氧化物簇助催化剂的设计和开发。

更新日期：2020-01-02

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