Deep insight into the photocatalytic activity and electronic structure of amorphous earth-abundant MgAl2O4,Inorganic Chemistry Frontiers

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Deep insight into the photocatalytic activity and electronic structure of amorphous earth-abundant MgAl2O4
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2017-09-14 00:00:00 , DOI: 10.1039/c7qi00478h
Xin Qian _{1,

2,

3,

4} , Bo Li _{2,

4,

5,

6} , Hui-ying Mu _{4,

7,

8} , Jie Ren _{1,

2,

3,

4} , Ying Liu _{1,

2,

3,

4} , Ying-juan Hao _{1,

2,

3,

4} , Fa-tang Li _{1,

2,

3,

4}

Affiliation

Developing inexpensive photocatalysts is of great value for industrial applications. In the work, magnesia–alumina spinel (MgAl₂O₄) made from earth-abundant elements is synthesized via a simple hydrothermal route and subsequent calcination. Theoretical calculation indicates that pure MgAl₂O₄ crystal has an energy band gap of 7.505 eV, and that the top of the valence band is mainly formed by hybridization between Mg-p and O-p states, while the bottom of the conduction band mainly originates from the Mg-s/p and O-s/p states. The UV-vis DRS results show that MgAl₂O₄ containing amorphous matter absorbs ultraviolet light with a band gap of 3.90 eV, which arises from the longer Mg–O bond length and presence of defects. This research also confirms that the visible-light photocatalytic activity reported in a previous paper is derived from the nitrogen element doping. The photocatalytic activity of MgAl₂O₄ is evaluated via the decomposition of methylene blue (MB) under UV-vis light illumination. The electron transfer route and the photocatalytic mechanism of MgAl₂O₄ for degrading MB are proposed. For the first time, the potentials of the energy bands of MgAl₂O₄ are obtained using Mott-Schottky electrochemical measurement.

中文翻译：

深入了解非晶态富含MgAl ₂ O ₄的光催化活性和电子结构

开发廉价的光催化剂对于工业应用具有巨大的价值。在这项工作中，通过简单的水热路线和随后的煅烧过程，合成了由富含地球元素的氧化镁-氧化铝尖晶石（MgAl ₂ O ₄）。理论计算表明，纯MgAl ₂ O ₄晶体的能带隙为7.505 eV，价带的顶部主要由Mg-p和Op杂化形成，而导带的底部主要来自Mg-s / p和Os / p状态。紫外可见DRS结果表明，MgAl ₂ O ₄包含无定形物质的紫外线吸收带隙为3.90 eV的紫外光，这是由于Mg-O键长度更长和存在缺陷所致。这项研究还证实了先前论文中报道的可见光光催化活性源自氮元素掺杂。MgAl ₂ O ₄的光催化活性是通过在紫外可见光下亚甲基蓝（MB）的分解来评估的。提出了MgAl ₂ O ₄降解MB的电子转移途径和光催化机理。首次使用Mott-Schottky电化学测量获得MgAl ₂ O ₄的能带势。

更新日期：2017-11-08

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