The reporter recently learned from the Hefei Research Institute of the Chinese Academy of Sciences that the research group of Huang Qing from the Institute of Intelligent Machinery of the Academy is targeting tetrachlorobiphenyl, a typical polychlorinated biphenyl. The degradation effect of tetrachlorobiphenyl has an important influence, and the active species of tetrachlorobiphenyl treated by different gas plasmas are also different. Relevant results were recently published in the environmental professional journal "Environmental Science".
At present, many countries have environmental pollution problems caused by persistent organic pollutants represented by PCBs. PCBs remaining in the environment cause potential harm to ecological balance and human health. Up to now, there is also a lack of efficient and standardized processing technology and methods for PCBs, and it is very urgent to develop green and efficient PCB processing technologies.
According to reports, this low-temperature plasma technology can remove various pollutants in the environment, and has the advantages of economy, practicality, simplicity, and no secondary pollution. The use of this technology to treat organic pollutants is one of the current research hotspots.
Researcher Huang Qing’s research group specially selected five gas conditions such as helium, argon, oxygen, air and nitrogen to conduct experiments in this research. It was found that under the conditions of inert gas, oxygen and air, plasma discharge has a positive effect on tetrachlorobiphenyl. The degradation effect is significant. For the mechanism study, the researchers focused on the contribution of helium plasma to produce hydroxyl radicals, long-lived active oxygen, ultraviolet light, hydrated electrons, etc., to the degradation of tetrachlorobiphenyl, and proved that hydroxyl radicals cause tetrachlorobiphenyl The main cause of degradation.
This achievement provides theoretical support for the use of low-temperature plasma technology to degrade PCBs, provides new ideas and methods for the treatment of persistent organic pollutants, and is useful for the development of high-efficiency environmental pollutant treatment technologies and the promotion of plasma pollutant removal The application development of technology is of great significance. (Reporter Wu Changfeng)
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