Abstract

This paper demonstrated the effects and influencing factors in degrading aniline by gaseous streamer corona plasma along water surface under different discharging gas atmospheres. For aniline with an initial concentration of 100 mg l−1, the degradation was fastest when the reactor was not ventilated, and the degradation rate is 98.5% under 7.5 min treatment. While the degradation was slowest when Ar was ventilated, the degradation rate is 98.6% after treatment for 60 min. Some active particles were detected using a multi-channel fibre-optic spectrometer during the discharge, such as Ar, OH, N2, and N. In particular, NO was detected during air discharge. The NO and could produce ; then generated nitric acid would affect the pH value of the solution. The intermediate product by N2 discharge is nitrophenol, and nitrophenol would be converted to p-benzoquinone. The O2 discharge could produce an intermediate product of aminophenol. The intermediate products in Ar discharge were in small amounts and the final mineralization effect was the best.

Highlights

  • Aniline is widely used as one of the most important intermediates in many industries, such as textile and petroleum [1]

  • Aniline is a kind of toxic organic pollutant that is harmful to the environment and humans; it is in the priority pollutants list of the US Environmental Protection Agency (EPA) [2]

  • The results of aniline degradation are shown in figure 3a, in which the results of experiments conducted with no gas ventilation are used as the control

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Summary

Introduction

Aniline is widely used as one of the most important intermediates in many industries, such as textile and petroleum [1]. Aniline is a kind of toxic organic pollutant that is harmful to the environment and humans; it is in the priority pollutants list of the US Environmental Protection Agency (EPA) [2]. Emergency accidents caused by aniline leakage have occurred frequently. These accidents, especially when aniline leaks into the water environment, always cause serious environmental problems and threaten human health [3]. Several methods have been employed for the treatment of aniline, such as bioremediation [4,5,6], oxidation [7,8] and adsorption [9,10,11].

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