Abstract
Nitrogen oxides (NOx) represent one of the main sources of haze and pollution of the atmosphere as well as the causes of photochemical smog and acid rain. Furthermore, it poses a serious threat to human health. With the increasing emission of NOx, it is urgent to control NOx. According to the different mechanisms of NOx removal methods, this paper elaborated on the adsorption method represented by activated carbon adsorption, analyzed the oxidation method represented by Fenton oxidation, discussed the reduction method represented by selective catalytic reduction, and summarized the plasma method represented by plasma-modified catalyst to remove NOx. At the same time, the current research status and existing problems of different NOx removal technologies were revealed and the future development prospects were forecasted.
Highlights
Nitrogen oxides (NOx) is one of the main sources of haze generation and air pollution in all worldwide
NOx comes from the natural factors of nitrate caused by decay of organism after biological death and plant straw-burning as well as in the lightning process; on the other hand, it stems from the artificial factors, for instance, iron and steel smelting; petroleum cracking and coal-based fossil fuel power generation; fuel vehicle exhaust emissions [1,2]; and NOx decomposition under the action of soil microorganisms, which is caused by the large amount of nitrogen fertilizer applied in farmland [3,4]
The emission of toxic waste gases has resulted in a significant increase in the content of NOx in the atmosphere, which is damaging to human organs, such as the heart and lungs, and reducing the body’s immunity [5], combining with volatile organic compounds to produce ozone [6], making the human body susceptible to respiratory diseases such as coughs, sore throat, and bronchitis [7,8]; it can lead to premature birth [9], severely inhibiting photosynthesis, and affects plant growth and oxygen conversion [10,11]; but, at the same time, produces photochemical smog [12,13] and acid rain [14]
Summary
NOx is one of the main sources of haze generation and air pollution in all worldwide. If ever, does a comprehensive article to introduce the current situation and treatment methods of removing NOx. In this paper, we tried to renovate, classify, and summarize the significant perspectives and most relevant findings reported in recent research articles and earlier reviews generalizing the mechanism analysis and research progress of NOx removal by adsorption, oxidation, reduction, and plasma methods, which can provide means for promoting the technological progress of pollution prevention, maintaining healthy development of factories continuously, studying the methods of removing NOx deeply, and mastering different technologies of removing NOx , as well as providing guidance for controlling the emission of NOx from motor vehicles such as diesel, gasoline, and so on. In order to improve the environmental quality and save the ecological environment, this paper further provides a convenient, low-cost, efficient, and economic guidance line
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