Abstract
A large amount of volatile organic compounds (VOCs) produced by industry have caused serious environmental pollution. In this paper, the removal effect of simulated xylene by strong ionization dielectric barrier discharge (DBD) plasma at atmospheric pressure and its degradation mechanism and pathway were studied. The effect of gas residence time, and initial xylene concentration was studied. The results showed that higher voltage caused an increase in discharge power, and with the increase of voltage, the concentration of ozone and nitrogen oxide in the reactor increased. The degradation efficiency decreased from 98.1% to 80.2% when xylene concentration increased from 50 ppm to 550 ppm at 4kV. And with the increase of residence time from 0.301s to 1s, the degradation efficiency increased from 78.5% to 98.6%. According to GC-MS analysis, the degradation products were ethyl acetate and n-hexylmethylamine at 4kv. And the main intermediates are 2,4-2-tert-butylphenol, 2-aminopentane, 2-methyl-5 - (2-aminopropyl) - phenol and propionamide at 1.5kV.
Highlights
Due to the increase of factory emissions and the decrease of green vegetation, there are more and more volatile organic compounds (VOCs) in the air
The purpose of this study was to investigate the operation of a strong ionization dielectric barrier discharge (DBD) to remove xylene from a synthetic polluted air stream
According to Kim[4], there are two main reaction mechanism schemes leading to the decomposition process of xylene in the strong ionization discharge chamber
Summary
Due to the increase of factory emissions and the decrease of green vegetation, there are more and more VOCs in the air. VOCs are very harmful to human health and environment. VOCs can stimulate the respiratory tract, kidney, lung, liver, digestive system, nervous system and hematopoietic system, and cause pathological changes. Some VOCs are toxic, irritant, teratogenic and carcinogenic. VOCs will react with NOx in the atmosphere to produce ozone, free radicals and other strong oxidizing secondary pollutants, producing photochemical smog[1]. The reaction results in the formation of tropospheric ozone, depletion of stratospheric ozone, secondary organic aerosols, and the absorption of thermal infrared, aggravating global warming
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