Fabrication of NH2-MIL-125 nanocrystals for high performance photocatalytic oxidation,Sustainable Energy & Fuels

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Fabrication of NH2-MIL-125 nanocrystals for high performance photocatalytic oxidation
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-03-17 , DOI: 10.1039/d0se00095g
Xiuniang Tan _{1,

2,

3,

4,

5} , Jianling Zhang _{1,

2,

3,

4,

5} , Jinbiao Shi _{1,

2,

3,

4,

5} , Xiuyan Cheng _{1,

2,

3,

4,

5} , Dongxing Tan _{1,

2,

3,

4,

5} , Bingxing Zhang _{1,

2,

3,

4,

5} , Lifei Liu _{1,

2,

3,

4,

5} , Fanyu Zhang _{1,

2,

3,

4,

5} , Buxing Han _{1,

2,

3,

4,

5} , Lirong Zheng _{5,

6,

7,

8,

9}

Affiliation

Developing a facile route for improving the photocatalytic performances of metal–organic frameworks is of great importance. Herein, we demonstrate for the first time that downsizing NH₂-MIL-125 crystals to the nanometer scale can greatly improve their activity for the photocatalytic benzylamine oxidation reaction. Under mild conditions, the conversion of benzylamine into N-benzylbenzaldimine reaches 98.5% in 9 h with a turnover frequency (TOF) value of 1063 μmol g⁻¹ h⁻¹ as catalyzed by NH₂-MIL-125 nanocrystals, much superior to NH₂-MIL-125 microcrystals (conversion 55.9% and TOF 570 μmol g⁻¹ h⁻¹, respectively). The as-synthesized NH₂-MIL-125 nanocrystals have a small crystal size, abundant oxygen vacancies, enhanced light absorption ability, strong oxygen reduction capacity, strengthened separation capability and transfer efficiency of photoexcited charges, conferring them high photocatalytic performance for the benzylamine oxidation reaction.

中文翻译：

用于高效光催化氧化的NH2-MIL-125纳米晶体的制备

开发一条简便的路线来改善金属有机骨架的光催化性能非常重要。在本文中，我们首次证明将NH ₂ -MIL-125晶体尺寸缩小到纳米级可以极大地提高其对光催化苄胺氧化反应的活性。在温和条件下，由NH ₂ -MIL-125纳米晶体催化，苄胺向N-苄基苯甲二胺的转化率在9小时内达到98.5％，周转频率（TOF）值为1063μmolg ^-1 h ^-1₂ -MIL-125微晶（转化率55.9％和TOF 570μmolg ^-1 h ^-1，分别）。合成后的NH ₂ -MIL-125纳米晶体晶体尺寸小，氧空位丰富，光吸收能力增强，氧还原能力强，光激发电荷的分离能力和转移效率增强，赋予了它们对苄胺氧化的高光催化性能。反应。

更新日期：2020-03-17

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