Aqueous p-nitrotoluene oxidation induced with direct glow discharge plasma

AbstractA plasma induced degradation process has been studied to treat 4-nitrotoluene (4-NT) present as an aqueous pollutant. The plasma was locally generated from a glow discharge around a tip of a platinum anode in an electrolytic solution. The influence of initial pH and Fe2+ on the degradation was examined. Major intermediates resulting from the degradation process were identified. Amongst the aromatic intermediates, p-hydroxybenzoic acid was the predominant degradation product. The formation of oxalic acid, malic acid was also observed. The final products of degradation were NH4+, NO3− and CO2. Based on the analysis of intermediates and the kinetic considerations, the degradation was shown to follow a pseudo-first order reaction hence, a possible reaction pathway was proposed.

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Degradation of methyl tert-butyl ether (MTBE) in water by glow discharge plasma

Water Science & Technology ◽

10.2166/wst.2011.621 ◽

2011 ◽

Vol 63 (12) ◽

pp. 2814-2819 ◽

Cited By ~ 8

Author(s):

Shaoping Tong ◽

Yanyan Ni ◽

Chensi Shen ◽

Yuezhong Wen ◽

Xuanzhen Jiang

Keyword(s):

Glow Discharge ◽

Discharge Plasma ◽

Glow Discharge Plasma ◽

Methyl Tert Butyl Ether ◽

Treatment Technology ◽

Butyl Ether ◽

Tert Butyl ◽

Highly Active ◽

Experimental Parameters ◽

Initial Ph

This study evaluated the ability of the glow discharge plasma (GDP) technique to degrade methyl tert-butyl ether (MTBE) in an aqueous solution. The results showed that a large amount of hydrogen peroxide and highly active •OH free radicals were produced during the treatment. Various experimental parameters including discharge current, initial MTBE concentration and initial pH played significant roles on MTBE degradation. In addition, Fe2+ had a catalytic effect on the degradation of MTBE, which is potentially attributable to the reaction between Fe3+ and the hydrated electron. It was also confirmed that GDP was comparable to electrocatalytic oxidation and high-density plasma and more efficient than photocatalytic degradation techniques. These results suggest that GDP may become a competitive MTBE wastewater treatment technology.

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Degradation of Aqueous Safranine T Solution by DC Glow Discharge Plasma at Atmospheric Pressure Air

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.610-613.2017 ◽

2012 ◽

Vol 610-613 ◽

pp. 2017-2022

Author(s):

Feng Qiu Wang ◽

Ai Hua Gao ◽

Fang Cheng

Keyword(s):

Glow Discharge ◽

Atmospheric Pressure ◽

Degradation Rate ◽

Discharge Plasma ◽

Degradation Process ◽

Energy Utilization ◽

Utilization Efficiency ◽

Glow Discharge Plasma ◽

Dc Glow Discharge ◽

Safranine T

The degradation of aqueous safranine T (ST) solution using direct current (DC) glow discharge plasma (GDP) at atmospheric pressure air was investigated. Several factors including pH, the gas gap between the anode tip and the solution surface, the anode needle sealed into the glass, which might impact the ST degradation process, were examined, respectively. Both the degradation rate of ST and the energy utilization efficiency were used as characteristic quantities to evaluate the degradation effect in our work. The results suggest that the highest degradation rate is 94.26% after 16 min treatment and the highest average energy utilization efficiency reaches 5.28 g/kWh in the 12 min treatment, the most suitable gas gap height and pH are 5 mm and 4.60, respectively. Meanwhile, the needle sealed with the glass facilitates the ST degradation process.

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