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

2016 ◽  
Vol 74 (6) ◽  
pp. 1365-1375 ◽  
Author(s):  
Chensi Shen ◽  
Shaoshuai Wu ◽  
Hui Chen ◽  
Sadia Rashid ◽  
Yuezhong Wen

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.

2011 ◽  
Vol 63 (12) ◽  
pp. 2814-2819 ◽  
Author(s):  
Shaoping Tong ◽  
Yanyan Ni ◽  
Chensi Shen ◽  
Yuezhong Wen ◽  
Xuanzhen Jiang

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.


2009 ◽  
Vol 40 (3) ◽  
pp. 615-619 ◽  
Author(s):  
Ke Gai ◽  
Huili Qi ◽  
Yuquan Zhang ◽  
Dongping Ma

BIOPHYSICS ◽  
2020 ◽  
Vol 65 (2) ◽  
pp. 283-286
Author(s):  
S. V. Belov ◽  
L. M. Apasheva ◽  
Yu. K. Danileiko ◽  
A. B. Egorov ◽  
A. V. Lobanov ◽  
...  

Langmuir ◽  
2006 ◽  
Vol 22 (1) ◽  
pp. 453-458 ◽  
Author(s):  
Andrew Nelson ◽  
Benjamin W. Muir ◽  
James Oldham ◽  
Celesta Fong ◽  
Keith M. McLean ◽  
...  

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