Enhancement of the working pH range for degradation of p-nitrophenol using Fe²⁺-aspartate and Fe²⁺-glutamate complexes as modified Fenton reagents

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• 作者：F.Z. Yehia ; Gh. Eshaq ; ^{ghadaamer2002@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; A.E. ElMetwally
• 关键词：Fenton ; Modified Fenton ; Advanced oxidation processes ; Aspartic acid ; Glutamic acid ; Nitrophenol
• 刊名：Egyptian Journal of Petroleum
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：25
• 期：2
• 页码：239-245
• 全文大小：1027 K

文摘

We examined the degradation of p-nitrophenol (p-NP) by a modified Fenton reaction at near neutral pH conditions using Fe^II–aspartate and Fe^II–glutamate complexes as a source of Fe²⁺. The reaction was conducted using 0.081 mM (10 mg L⁻¹) of p-NP in the presence of 65 mM H₂O₂ at room temperature. Complex concentrations of 5, 10, 15 and 20 mM (Fe²⁺ = 0.81, 1.62, 2.43 and 3.23 mM) were assayed which showed effective extents of p-NP degradation. In the pH range 5–7 the complex activity is pH dependent, and the optimal pH was 6.3. The degradation was monitored by an HPLC system. The rate of degradation recorded at near neutral pH in the presence of 20 mM of Fe–aspartate and Fe–glutamate complexes was equal to that obtained in the presence of Fe²⁺ (2.5 mM) at pH 2.7. Aspartate and glutamate complexes formed with Cu²⁺ or Co²⁺ did not show the improved degradation observed in the case of Fe^II–aspartate and Fe^II–glutamate.