通过修正的泊松-波尔兹曼方程阐明导电超滤膜上的电吸附机理

IF 3.3 4区 工程技术 Q2 CHEMISTRY, PHYSICAL Membranes Pub Date : 2024-08-10 DOI:10.3390/membranes14080175
Muhammad Usman, Shahrokh Vahedi, Sarah Glass, Volkan Filiz, Mathias Ernst
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引用次数: 0

摘要

通过磁控溅射在多孔乙二胺改性聚丙烯腈(PAN-EDA)超滤膜上涂覆一层超薄铂(Pt)纳米粒子,制备了导电膜(ECM)。这些 ECM 被用于电过滤,研究在正电位(0-2.5 V)条件下从水溶液中去除亮蓝染料的情况。此外,还研究了负电位(-1.0--2.5 V),以便通过解吸 ECM 表面的染料来再生膜。在 +0 V 时,EC PAN-EDA 膜因其固有的正电荷而吸附染料。施加 -2.0 V 时,染料的解吸率最高达 39%。修正的泊松-波尔兹曼(MPB)模型显示,-2.0 V 在膜基质的前 24 纳米内产生了排斥力,这对吸附在膜深处的染料离子的影响微乎其微,因此将电解吸效率限制在 39%。此外,将正电位从 +0.5 V 提高到 +2.5 V,可使染料电吸附增加 9.5 倍,在 pH 值为 8(相当于膜的等电点)时,从 132 mg/m2 增加到 1112 mg/m2。MBP 模拟表明,电吸附负载量的增加与吸引力的增加有关,这表明吸引力诱导的电吸附是主要机制,其他机制(如电化学氧化)的作用被排除在外。在 pH 值为 5 时,电吸附进一步增加到 1390 mg/m2,这可能是由于与 pH 值为 8 时相比,膜带有额外的正电荷(zeta 电位 = 9.2 mV)。这些发现有助于阐明以染料为模型的有机化合物(如腐殖酸)在 ECM 上的电吸附和解吸机制。
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Elucidating the Mechanism of Electro-Adsorption on Electrically Conductive Ultrafiltration Membranes via Modified Poisson-Boltzmann Equation.

Electrically conductive membranes (ECMs) were prepared by coating porous ethylenediamine-modified polyacrylonitrile (PAN-EDA) UF membranes with an ultrathin layer of platinum (Pt) nanoparticles through magnetron sputtering. These ECMs were used in electrofiltration to study the removal of brilliant blue dye from an aqueous solution under positive electrical potentials (0-2.5 V). Negative electrical potentials (-1.0--2.5 V) were also investigated to regenerate the membrane by desorbing the dye from the ECM surface. At +0 V, the EC PAN-EDA membrane adsorbed the dye due to its intrinsic positive charge. Application of -2.0 V resulted in a maximum of 39% desorption of the dye. A modified Poisson-Boltzmann (MPB) model showed that -2.0 V created a repulsive force within the first 24 nm of the membrane matrix, which had a minimal effect on dye ions adsorbed deeper within the membrane, thus limiting the electro-desorption efficiency to 39%. Moreover, increasing positive potentials from +0.5 V to +2.5 V led to increased dye electro-adsorption by 9.5 times, from 132 mg/m2 to 1112 mg/m2 at pH 8 (equivalent to the membrane's isoelectric point). The MBP simulations demonstrated that increasing electro-adsorption loadings are related to increasing attractive force, indicating electro-adsorption induced by attractive force is the dominant mechanism and the role of other mechanisms (e.g., electrochemical oxidation) is excluded. At pH 5, electro-adsorption further increased to 1390 mg/m2, likely due to the additional positive charge of the membrane (zeta potential = 9.2 mV) compared to pH 8. At pH 8, complete desorption of the dye from the ECM surface was achieved with a significant repulsive force at -2.0 V. However, as pH decreased from 8 to 5, the desorption efficiency decreased by 3.9% due to the membrane's positive charge. These findings help elucidate the mechanisms of electro-adsorption and desorption on ECMs using dye as a model for organic compounds like humic acids.

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来源期刊
Membranes
Membranes Chemical Engineering-Filtration and Separation
CiteScore
6.10
自引率
16.70%
发文量
1071
审稿时长
11 weeks
期刊介绍: Membranes (ISSN 2077-0375) is an international, peer-reviewed open access journal of separation science and technology. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided.
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