4.8 Review

A Critical Review on Removal of Gaseous Pollutants Using Sulfate Radical-based Advanced Oxidation Technologies

期刊

ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 55, 期 14, 页码 9691-9710

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c01531

关键词

SO2 and NOx; Mercury and arsenic; VOCs; Gaseous pollutants; Hydroxyl radical and sulfate radical; Advanced oxidation technologies (AOTs)

资金

  1. National Natural Science Foundation of China [U1710108]
  2. Young academic leaders project of Young Talents Program of Jiangsu University

向作者/读者索取更多资源

The sulfate radical-based advanced oxidation technologies show promise in removing gaseous pollutants, but face challenges like unreliable technology and high costs. Combining multiple activation technologies can help overcome these drawbacks, while improving free radical yield and pollutant removal capacity, and conducting research to reduce costs are critical for further advancement.
Excessive emissions of gaseous pollutants such as SO2, NOx, heavy metals (Hg, As, etc.), H2S, VOCs, etc. have triggered a series of environmental pollution incidents. Sulfate radical (SO4 center dot(-))-based advanced oxidation technologies (AOTs) are one of the most promising gaseous pollutants removal technologies because they can not only produce active free radicals with strong oxidation ability to simultaneously degrade most of gaseous pollutants, but also their reaction processes are environmentally friendly. However, so far, the special review focusing on gaseous pollutants removal using SO4 center dot(-)-based AOTs is not reported. This review reports the latest advances in removal of gaseous pollutants (e.g., SO2, NOx, Hg, As, H2S, and VOCs) using SO4 center dot(-)-based AOTs. The performance, mechanism, active species identification and advantages/disadvantages of these removal technologies using SO4 center dot(-)-based AOTs are reviewed. The existing challenges and further research suggestions are also commented. Results show that SO4 center dot(-)-based AOTs possess good development potential in gaseous pollutant control field due to simple reagent transportation and storage, low product post-treatment requirements and strong degradation ability of refractory pollutants. Each SO4 center dot(-)-based AOT possesses its own advantages and disadvantages in terms of removal performance, cost, reliability, and product post-treatment. Low free radical yield, poor removal capacity, unclear removal mechanism/contribution of active species, unreliable technology and high cost are still the main problems in this field. The combined use of multiactivation technologies is one of the promising strategies to overcome these defects since it may make up for the shortcomings of independent technology. In order to improve free radical yield and pollutant removal capacity, enhancement of mass transfer and optimization design of reactor are critical issues. Comprehensive consideration of catalytic materials, removal chemistry, mass transfer and reactor is the promising route to solve these problems. In order to clarify removal mechanism, it is essential to select suitable free radical sacrificial agents, probes and spin trapping agents, which possess high selectivity for target specie, high solubility in water, and little effect on activity of catalyst itself and mass transfer/diffusion parameters. In order to further reduce investment and operating costs, it is necessary to carry out the related studies on simultaneous removal of more gaseous pollutants.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.8
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据