壳聚糖
催化作用
吸附
化学
核化学
磁铁矿
氢氧化钠
降级(电信)
傅里叶变换红外光谱
共沉淀
金属
化学工程
无机化学
材料科学
有机化学
冶金
工程类
电信
计算机科学
作者
Soumaya Rezgui,Abdeltif Amrane,Florence Fourcade,Aymen Amine Assadi,Lotfi Monser,Nafaâ Adhoum
标识
DOI:10.1016/j.apcatb.2017.12.061
摘要
The degradation of chlordimeform (CDM) has been investigated by a heterogeneous electro-Fenton process involving magnetite supported chitosan beads (Fe3O4-Cs) as catalyst. The catalyst was prepared by dropwise addition of an acidic chitosan-metal salts solution into sodium hydroxide precipitation bath. SEM, XRD and FTIR analysis were used to characterize the catalysts. The effect of experimental parameters, such as the current intensity, the amount of iron on chitosan beads, the concentration of the catalyst and the initial pH on the pollutant removal rate was investigated. The optimal conditions for the degradation of 37.5 mg L−1 initial CDM concentration were achieved at an applied cathodic current of −5 mA, using 0.5 g L−1 of magnetic chitosan beads (with an average iron amount of 0.104 mmol) and at pH = 3. Under these conditions, CDM was effectively removed within 30 min with 80% of NPOC removal after 6 h of treatment. The reaction followed a pseudo-first order kinetic equation. The adsorption test on the chitosan beads (with and without iron) demonstrated that the insecticide removal was solely induced by heterogeneous electro-Fenton treatment with Fe3O4-CS beads. In addition, the reusability of this catalyst was effectively demonstrated. Finally, LC–MS analysis allowed the proposal of a plausible degradation route.
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