Efficient phenol removal by δ-MnO2 synthesized in situ on a self-supporting membrane

IF 4.1 2区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

iScience Pub Date : 2025-09-05 DOI:10.1016/j.isci.2025.113482

Yi Liu

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Abstract

Manganese oxides are effective environmental coupling oxidants for the conversion of phenol; however, previous research has mainly focused on their powdered rather than immobilized forms. To address this gap, the oxidative removal of phenol from aqueous solutions was investigated using δ-MnO₂, which was synthesized in situ and immobilized on a tailorable self-supporting membrane carrier (MnO₂/M). The Freundlich isotherm provided the best fit for adsorption, whereas Sips successfully indicated the highest adsorption capacity. Kinetic analyses showed that the pseudo-second-order and electron transfer control models represented the reaction dynamics, with intra-particle diffusion and liquid film diffusion playing crucial roles. Physicochemical calculations confirmed the exothermic and spontaneous nature of the reaction (ΔG = −31.65 kJ/mol; 298 K). This research also clarifies and elucidates the two-electron direct oxidative transfer processes involved in the oxidative transformation of phenol by the MnO₂/H⁺ heterogeneous system, establishing a framework for advancing environmental remediation using Mn-based materials.

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自支撑膜上原位合成δ-MnO2高效脱酚

锰氧化物是苯酚转化的有效环境偶联氧化剂；然而，以前的研究主要集中在它们的粉末状而不是固定化形式。为了解决这一空白，研究了原位合成δ-MnO2并将其固定在自支撑膜载体（MnO2/M）上的水溶液中苯酚的氧化去除。Freundlich等温线吸附效果最佳，而Sips等温线吸附量最高。动力学分析表明，伪二阶控制模型和电子传递控制模型代表了反应动力学，其中颗粒内扩散和液膜扩散起关键作用。物理化学计算证实了该反应的放热自发性质（ΔG =−31.65 kJ/mol; 298 K）。本研究还阐明了MnO2/H+非均相体系氧化转化苯酚的双电子直接氧化转移过程，为推进锰基材料的环境修复建立了框架。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

iScience Multidisciplinary-Multidisciplinary

CiteScore

7.20

自引率

1.70%

发文量

1972

审稿时长

6 weeks

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