Aqueous 4-nitrophenol decomposition and hydrogen peroxide formation induced by contact glow discharge electrolysis.
Liquid-phase decomposition of 4-nitrophenol (4-NP) and formation of hydrogen peroxide (H(2)O(2)) induced by contact glow discharge electrolysis (CGDE) were investigated. Experimental results showed that the decays of 4-NP and total organic carbon (TOC) obeyed the first-order and pseudo-first-order reaction kinetics, respectively. The major intermediate products were 4-nitrocatechol, hydroquinone, benzoquinone, hydroxyhydroquinone, organic acids and nitrite ion. The final products were carbon dioxide and nitrate ion. The initial formation rate of H(2)O(2) decreased linearly with increasing initial concentration of 4-NP. Addition of iron ions, especially ferric ion, to the solution significantly enhanced the 4-NP removal due to the additional hydroxyl radical formation through Fenton's reaction. A reaction pathway is proposed based on the degradation kinetics and the distribution of intermediate products.
Liu
Yongjun
Y
College of Environmental Science & Engineering, Dalian Maritime University, Dalian, PR China. lyjglow@sohu.com
Wang
Degao
D
Sun
Bing
B
Zhu
Xiaomei
X
D002245:Carbon Dioxide; D002396:Catechols; D004572:Electrolysis / Q000379:methods; D052918:Environmental Restoration and Remediation / Q000379:methods; D006861:Hydrogen Peroxide; D007700:Kinetics; D009566:Nitrates; D009596:Nitrophenols / Q000737:chemistry*; D011809:Quinones; D014874:Water Pollutants, Chemical / Q000737:chemistry*
D002396:Catechols; D009566:Nitrates; D009596:Nitrophenols; D011809:Quinones; D014874:Water Pollutants, Chemical; D002245:Carbon Dioxide; D006861:Hydrogen Peroxide; C001833:4-nitrocatechol; C024836:4-nitrophenol