Abstract

The natural Na-type montmorillonite (Na-MMT) was pillared by iron polycation to obtain Fe-pillared montmorillonite (Fe-MMT). The materials were characterized by X-ray powder diffraction and N₂ adsorption–desorption at low temperature. It was found that iron polycation was successfully inserted into MMT layers, and the textural properties of Fe-MMT could be adjusted by altering the amount of iron. Meanwhile, the decolorization of methyl orange (MO) by heterogeneous Fenton-like oxidation using Fe-MMT as catalyst was evaluated. The experimental results showed that Fe-MMT exhibited good decolorization performance of MO under 2.0 g L⁻¹ of Fe-MMT-1.5, initial pH of solution 4, reaction time 90 min, and H₂O₂ concentration of 5 mmol L⁻¹. Fe-MMT exhibited good stability for the decolorization of MO in solution for three successive runs. The decolorization process could be well described by pseudo firstorder kinetics model.

Graphic abstract

Na-montmorillonite (MMT) pillared by iron polycation (Fe-MMT), an efficient Fenton-like catalyst was developed. The decolorization efficiency of methyl orange (MO) was dependent on the textural properties of Fe-MMT adjusted by altering the amount of iron. Excellent decolorization efficiency of MO (91.6–87.9%) was achieved under the optimal conditions.

中文翻译：

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铁柱状蒙脱石作为有效的非均相芬顿催化剂，用于甲基橙的脱色

摘要

天然Na型蒙脱土（Na-MMT）通过铁聚阳离子柱撑得到铁柱状蒙脱土（Fe-MMT）。该材料通过X射线粉末衍射和低温下的N ₂吸附-解吸进行表征。已经发现，铁聚阳离子被成功地插入到MMT层中，并且可以通过改变铁的量来调节Fe-MMT的组织性质。同时，评价了以Fe-MMT为催化剂的非均相Fenton样氧化对甲基橙（MO）的脱色。实验结果表明，Fe-MMT在Fe-MMT-1.5为2.0 g L ^-1，溶液的初始pH为4，反应时间为90分钟，H ₂ O ₂浓度为5 mmol L的条件下表现出良好的MO脱色性能。^-1。Fe-MMT对溶液中MO的脱色表现出良好的稳定性，连续运行了3次。用伪一级动力学模型可以很好地描述脱色过程。

图形摘要

以铁聚阳离子（Fe-MMT）为柱基的钠蒙脱石（MMT）是一种高效的芬顿类催化剂。甲基橙（MO）的脱色效率取决于通过改变铁含量而调节的Fe-MMT的组织特性。在最佳条件下，MO的脱色效率极高（91.6-87.9％）。