Fe(II)与交联壳聚糖螯合在改良芬顿反应中对三氯乙烯的降解。
Degradation of trichloroethylene by Fe(II) chelated with cross-linked chitosan in a modified Fenton reaction.
机构信息
Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-Dong, Yuseong-Gu, Daejon 305-701, Republic of Korea.
出版信息
J Hazard Mater. 2010 Jun 15;178(1-3):187-93. doi: 10.1016/j.jhazmat.2010.01.062. Epub 2010 Jan 18.
Degradation of trichloroethylene (TCE) by a modified Fenton reaction was investigated in aqueous solution. Fenton reaction can be significantly enhanced in the presence of Fe(II) chelated by cross-linked chitosan (CS) with glutaraldehyde (GLA) at neutral pH. A remarkable oxidative degradation of TCE (1.838 h(-1)) was observed in the modified Fenton system with Fe(II)-CS/GLA (10 mM and 2 g L(-1), respectively) and H(2)O(2) (318 mM), while no significant degradation (0.005 h(-1)) was observed in the classic Fenton reaction system with Fe(II) (10 mM) and H(2)O(2) (318 mM) at pH 7 in 5 h. The kinetic rate constants for the degradation of TCE in the modified Fenton system was dependent on the initial suspension pH, Fe(II) loading, CS/GLA dosage, and concentration of H(2)O(2). We observed the formation of surface Fe(II)-CS/GLA complex using microscopic analyses and identified Fe oxidation (Fe(II) to Fe(III)) coupled with H(2)O(2) reduction on the Fe(II)-CS/GLA surfaces during the modified Fenton reaction.
在水溶液中研究了用改良的芬顿反应降解三氯乙烯（TCE）。在中性 pH 下，用戊二醛交联壳聚糖（CS）螯合的 Fe(II)可显著增强芬顿反应。在改良的芬顿体系中，用 Fe(II)-CS/GLA（分别为 10 mM 和 2 g/L）和 H₂O₂（318 mM）可观察到 TCE 的显著氧化降解（1.838 h⁻¹），而在经典芬顿反应体系中，用 Fe(II)（10 mM）和 H₂O₂（318 mM）在 5 h 内，pH 为 7 时，降解速度（0.005 h⁻¹）则不明显。改良的芬顿体系中 TCE 降解的动力学速率常数取决于初始悬浮液 pH、Fe(II)负载量、CS/GLA 用量和 H₂O₂浓度。我们使用微观分析观察到表面 Fe(II)-CS/GLA 络合物的形成，并在改良的芬顿反应过程中确定了 Fe 氧化（Fe(II)到 Fe(III)）与 Fe(II)-CS/GLA 表面上的 H₂O₂还原偶联。
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