Highly selective photo-hydroxylation of phenol using ultrathin NiFe-layered double hydroxide nanosheets under visible-light up to 550 nm,Green Chemistry

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Highly selective photo-hydroxylation of phenol using ultrathin NiFe-layered double hydroxide nanosheets under visible-light up to 550 nm
Green Chemistry ( IF 9.3 ) Pub Date : 2020-10-26 , DOI: 10.1039/d0gc02786c
Jikang Wang _{1,

2,

3,

4} , Yanqi Xu _{1,

2,

3,

4,

5} , Jiaxin Li _{1,

2,

3,

4} , Xiaodong Ma _{1,

2,

3,

4} , Si-Min Xu _{1,

2,

3,

4} , Rui Gao _{4,

6,

7,

8} , Yufei Zhao _{1,

2,

3,

4} , Yu-Fei Song _{1,

2,

3,

4}

Affiliation

Dihydroxybenzenes (DHB) are one of the most important fine chemicals used as raw materials or intermediates in industries. One-step selective phenol hydroxylation using a photo-Fenton system is an attractive and challenging strategy, especially under long-wavelength irradiation. Herein, we report that a highly selective photo-driven Fenton hydroxylation reaction of phenol to DHB can be achieved over NiFe-layered double hydroxide nanosheets (NiFe-NS) under visible-light irradiation with 70% phenol conversion and ∼99% DHB selectivity. A more interesting finding is that a high phenol conversion (∼40%) activity can be maintained even under monochromatic irradiation at 550 nm. The superior photocatalytic activity was attributed to the abundant defects in NiFe-NS, which facilitated the adsorption of hydrogen peroxide (H₂O₂) onto the catalyst surface and promoted the transfer efficiency of photoinduced electrons from the catalyst to H₂O₂, generating ˙OH radicals to participate in the hydroxylation of phenol.

中文翻译：

使用超薄NiFe层状双氢氧化物纳米片在高达550 nm的可见光下对苯酚进行选择性光羟基化

二羟基苯（DHB）是用作工业原料或中间体的最重要的精细化学品之一。使用光芬顿系统的一步选择性酚羟基化是一种有吸引力且具有挑战性的策略，尤其是在长波长辐射下。本文中，我们报道了在可见光照射下，具有70％苯酚转化率和〜99％DHB选择性的NiFe层状双氢氧化物纳米片（NiFe-NS）可以实现苯酚对DHB的高选择性光驱动Fenton羟基化反应。一个更有趣的发现是，即使在550 nm的单色照射下，也可以保持较高的苯酚转化率（〜40％）。优异的光催化活性归因于NiFe-NS中大量的缺陷，这促进了过氧化氢（H ₂O ₂）转移到催化剂表面，并促进了光致电子从催化剂到H ₂ O ₂的转移效率，产生了˙OH自由基，从而参与了酚的羟基化反应。

更新日期：2020-11-12

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