Phthalate degradation by glow discharge plasma enhanced with pyrite in aqueous solution.
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 × 10-9and 1.210 × 10-9mol/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.
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
Chensi
C
Shen
Sanqishi Township Government of Yuyao City, Yuyao 315412, China.
Shaoshuai
S
Wu
Zhejiang Avocado Biotechnologies Co., Ltd, Yuyao 315412, China.
Hui
H
Chen
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
Sadia
S
Rashid
Institute of Environmental Science, Zhejiang University, Hangzhou 310029, China E-mail: wenyuezhong@zju.edu.cn.
Yuezhong
Y
Wen
D001559:Benzhydryl Compounds; D002384:Catalysis; D006861:Hydrogen Peroxide / Q000737:chemistry; D007501:Iron / Q000737:chemistry*; D008738:Methyl Ethers; D015394:Molecular Structure; D010636:Phenols; D010795:Phthalic Acids / Q000737:chemistry*; D013440:Sulfides / Q000737:chemistry*; D062065:Wastewater; D014874:Water Pollutants, Chemical; D014961:X-Ray Diffraction; D000098826:Bisphenol A Compounds
D001559:Benzhydryl Compounds; D006861:Hydrogen Peroxide; D007501:Iron; D008738:Methyl Ethers; D010636:Phenols; D010795:Phthalic Acids; D013440:Sulfides; D062065:Wastewater; D014874:Water Pollutants, Chemical; C011342:pyrite; C043243:methyl tert-butyl ether; C032279:phthalic acid; C006780:bisphenol A; D000098826:Bisphenol A Compounds