Indirect Electrochemical Treatment of Bisphenol A in Water via Electrochemically Generated Fenton's Reagent

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• 作者：Belg//pubs.acs.org/images/entities/idot.gif" border="0">n Gö ; zmen ; Mehmet A. Oturan ; N//pubs.acs.org/images/entities/idot.gif" border="0">hal Oturan ; and Oktay Erbatu
• 刊名：Environmental Science & Technology
• 出版年：2003
• 出版时间：August 15, 2003
• 年：2003
• 卷：37
• 期：16
• 页码：3716 - 3723
• 全文大小：143K
• 年卷期：v.37,no.16(August 15, 2003)
• ISSN：1520-5851

文摘

Bisphenol A (BPA) has been treated with electrochemicallygenerated Fenton's reagent in aqueous medium. Hydroxylradicals that were formed in Fenton's reagent reactedwith the organic substrate producing two different isomersof monohydroxylated product and, upon successivehydroxylation, mainly one dihydroxylated product. Furtherhydroxylation first degraded one of the aromatic rings, andthe side chain thus formed was then cleaved off theother aromatic ring. The second aromatic ring was alsodegraded upon successive hydroxylations. Small saturatedand unsaturated aliphatic acids were the last productsprior to mineralization. It was found that use of cuprous/cupric ion pair resulted a faster conversion of BPA and fastermineralization when compared using ferrous/ferric ions,but this happened at the expence of excess electrical chargeutilized for an equivalent conversion or mineralization.Degradation by using ferrous/ferric ions was more efficientthan cuprous/cupric ions case in terms of total mineralizationversus charge utilized, and a mineralization of 82% hadbeen achieved by applying 107.8 mF of charge to a 0.7 mMBPA solution of 0.200 dm³. The rate constant of themonohydroxylation of BPA in the presence of ferrous/ferric ions had been determined as 1.0 × 10¹⁰ M^-1 s^-1 whereBPA and salicylic acid competitively reacted with hydroxylradicals in aqueous medium with the initial concentrationsof Fe²⁺, BPA, and SA of 1.0, 0.5, and 0.5 mM, respectively.In a similar experiment where the initial concentrationsof Cu²⁺, BPA, and SA were 1.0, 0.5, and 0.5 mM, respectively,the corresponding rate constant was determined to bethe same as the rate constant obtained for Fe²⁺ (i.e., 1.0× 10¹⁰ M^-1 s^-1). While the use of Cu²⁺ cannot be advisedfor processing BPA and similar substrates by using theelectro-Fenton technique for both technical and economicalreasons, the use of [Fe²⁺]/[BPA]₀ values in the range3-4 will be sufficient to achieve an efficient mineralizationof BPA and similar substrates by the electro-Fentonprocess in aqueous medium.