Enhancement of photocatalytic NO removal activity of g-C3N4 by modification with illite particles,Environmental Science: Nano

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Enhancement of photocatalytic NO removal activity of g-C3N4 by modification with illite particles
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-06-08 , DOI: 10.1039/d0en00415d
Xin Li _{1,

2,

3,

4} , Guohui Dong _{1,

2,

3,

4} , Fengjiao Guo _{4,

5,

6,

7} , Pengfei Zhu _{1,

2,

3,

4} , Yu Huang _{4,

8,

9,

10} , Chuanyi Wang _{1,

2,

3,

4}

Affiliation

Low-concentration nitrogen oxide (NO_x) is a major atmospheric pollutant that can ideally be removed by photocatalysis. At present, photocatalytic techniques for NO removal still suffer from certain problems, such as low efficiency and secondary pollution. In this study, the surface of g-C₃N₄ was modified with illite particles, which not only enhanced the photocatalytic NO removal activity of g-C₃N₄, but also reduced the generation of secondary pollutants (NO₂). This is mainly attributed to the formation of heterojunctions between illite and g-C₃N₄, which promoted charge transfer. Moreover, interface defects and an electric field were formed when the surface of g-C₃N₄ was modified with illite. These interface defects and the electric field could further accelerate interfacial charge transfer. Additionally, modification with illite caused the surface of g-C₃N₄ to peel and roll up. These curls increased O₂ adsorption on the composite to produce more reactive oxygen species. This study provides new insight into the effective utilization of natural minerals in pollution control.

中文翻译：

通过伊利石颗粒改性提高g-C3N4的光催化NO去除活性

低浓度氮氧化物（NO _x）是主要的大气污染物，可以理想地通过光催化去除。目前，用于去除NO的光催化技术仍然存在某些问题，例如效率低和二次污染。在这项研究中，用伊利石颗粒对gC ₃ N ₄的表面进行了改性，这不仅增强了gC ₃ N ₄的光催化去除NO的活性，而且减少了二次污染物（NO ₂）的产生。这主要归因于伊利石与gC ₃ N ₄之间形成异质结，这促进了电荷转移。此外，当用伊利石对gC ₃ N ₄的表面进行改性时，形成了界面缺陷和电场。这些界面缺陷和电场可进一步加速界面电荷转移。另外，用伊利石的改性导致gC ₃ N ₄的表面剥离并卷起。这些卷曲增加了O ₂在复合材料上的吸附，从而产生更多的活性氧。这项研究提供了对天然矿物在污染控制中的有效利用的新见解。

更新日期：2020-07-16

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