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

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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Phthalate degradation by glow discharge plasma enhanced with pyrite in aqueous solution

Water Science & Technology ◽

10.2166/wst.2016.316 ◽

2016 ◽

Vol 74 (6) ◽

pp. 1365-1375 ◽

Cited By ~ 3

Author(s):

Chensi Shen ◽

Shaoshuai Wu ◽

Hui Chen ◽

Sadia Rashid ◽

Yuezhong Wen

Keyword(s):

Aqueous Solution ◽

Energy Efficiency ◽

Glow Discharge ◽

Discharge Plasma ◽

Ph Value ◽

Glow Discharge Plasma ◽

Methyl Tert Butyl Ether ◽

Butyl Ether ◽

Polymeric Compound ◽

X Ray

In order to prevent health risk from potential exposures to phthalates, a glow discharge plasma (GDP) process was applied for phthalate degradation in aqueous solution. The results revealed that the phthalate derivatives 4-hydroxyphthalic acid, 4-methylphthalic acid and 4-tert-butylphthalic anhydride could be degraded efficiently in GDP process (498 V, 0.2 A) with high removal efficiencies of over 99% in 60 minutes. Additionally, pyrite as a promising heterogeneous iron source in the Fenton reaction was found to be favorable for GDP process. The phthalate degradation reaction could be significantly enhanced by the continuous formation of •OH and the inhibition of the quenching reaction in the pyrite Fenton system due to the constant dissolution of Fe(II) from pyrite surface. Meanwhile, the initial pH value showed little impact on the degradation of phthalates and the energy efficiency of GDP system for phthalate degradation ranged between 0.280 × 10−9 and 1.210 × 10−9 mol/J, which is similar to the GDP system with phenol, bisphenol A and methyl tert-butyl ether as the substrates. Further, the X-ray diffraction and scanning electron microscopy with energy dispersive X-ray spectroscopy analyses indicated that the pyrite was relatively stable in GDP system and there was no obvious polymeric compound formed on the catalyst surface. Overall, this GDP process offers high removal efficiency, simple technology, considerable energy efficiency and the applicability to salt-containing phthalate wastewater.

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Preparation of stable and highly active Ni/CeO2 catalysts by glow discharge plasma technique for glycerol steam reforming

Applied Catalysis B Environmental ◽

10.1016/j.apcatb.2019.02.074 ◽

2019 ◽

Vol 249 ◽

pp. 257-265 ◽

Cited By ~ 24

Author(s):

Bo Wang ◽

Yingying Xiong ◽

Yaoyao Han ◽

Jingping Hong ◽

Yuhua Zhang ◽

...

Keyword(s):

Glow Discharge ◽

Steam Reforming ◽

Discharge Plasma ◽

Glow Discharge Plasma ◽

Plasma Technique ◽

Highly Active

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Aqueous p-nitrotoluene oxidation induced with direct glow discharge plasma

Open Chemistry ◽

10.2478/bf02479269 ◽

2005 ◽

Vol 3 (3) ◽

pp. 377-386 ◽

Cited By ~ 2

Author(s):

Jinzhang Gao ◽

Yongjun Liu ◽

Wu Yang ◽

Lumei Pu ◽

Jie Yu ◽

...

Keyword(s):

Glow Discharge ◽

Discharge Plasma ◽

Reaction Pathway ◽

Degradation Process ◽

Glow Discharge Plasma ◽

Electrolytic Solution ◽

Pseudo First Order Reaction ◽

First Order ◽

Platinum Anode ◽

Initial Ph

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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