Advances in Photocatalytic Removal of Nitrogen Oxides at the Physical and Chemical Sites in Xinjiang

Nitrogen oxides (NOX) is one of the major sources of air pollution. It not only causes acid rain, smog, photochemical smog, ozone layer destruction, greenhouse effect and other harsh environmental phenomena, but also has a very serious toxic effect on humans, animals and plants. . With the development of modern industry and the increasing number of motor vehicles, human beings have emitted more NOx (95% NO) into the atmosphere.

In recent years, scientists from the Research Institute of Environmental Science and Technology of the Xinjiang Institute of Physics and Chemistry, Chinese Academy of Sciences began to study the photocatalytic removal of nitrogen oxides. After many photocatalysts were tried, it was discovered that g-C3N4 was undergoing photocatalytic removal of NO. Has the characteristics of cheap, stable and has a broad application prospects. However, the unmodified g-C3N4 has the problems of low activity and secondary pollution (removal of NO2) during photocatalytic removal of NO. After continuous experiments, the team's researchers developed some modification methods that can improve the photocatalytic activity of removing NO from g-C3N4 and completely oxidize NO to NO3- (Appl. Catal., B: Environ. 2015, 174-175, 477-485). However, these methods still have the problem of low activity and secondary pollution, as well as the problem that NO3- is easily adsorbed on the active site of g-C3N4 to cause inactivation of g-C3N4. Therefore, it is very important to find a modification method that can make g-C3N4 efficiently and completely oxidize NO, and can effectively relieve the inactivation of g-C3N4.

Recently, the team's researchers inspired by the plant photosynthesis electron transfer mechanism, developed a new all-solid-state "Z-type" light by grafting organic semiconductor phthalimide (PTCDI) on the surface of g-C3N4. Catalyst (PI-g-C3N4). Compared with pure g-C3N4 and PTCDI, PI-g-C3N4 possesses stronger oxidizing and reducing power. In the photocatalytic removal of NO, PI-g-C3N4 can be divided into three steps to complete the removal of NO. First, NO is oxidized to NO2 in the PTCDI part of the PI-g-C3N4 system, while O2 is reduced to H2O2 in the g-C3N4 part; subsequently, after diffusion, NO2 is oxidized to NO3-(H2O2) outside the active site. figure 1). In this way, PI-g-C3N4 can efficiently and completely oxidize NO to NO3-, and can effectively relieve the inactivation of NO3-.

The related research results were recently published in the international magazine ACS Catalysis and attracted extensive attention from their peers. The research work was supported by the National Natural Science Foundation of China, the "Hundred Talents Program" of the Chinese Academy of Sciences, the Innovation International Team of the Chinese Academy of Sciences, and the "Light of the West" of the Chinese Academy of Sciences.

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