A rapid microwave-assisted solvothermal La3+ ion exchange of NaA zeolite membranes for enhanced performance of ethanol dehydration

IF 4.7 3区材料科学 Q1 CHEMISTRY, APPLIED Microporous and Mesoporous Materials Pub Date : 2025-04-16 DOI:10.1016/j.micromeso.2025.113645

Wenbin Zhao , Jinhuai Hua , Yi Cao , Rui Yao , Yanshuo Li

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Abstract

A microwave-assisted solvothermal method was developed to achieve La³⁺ exchange in NaA zeolite membranes for enhanced ethanol dehydration via pervaporation. Traditional ion-exchange processes are time-consuming and risk structural degradation, whereas the proposed approach utilizes alcohol-based solvents under microwave irradiation to accelerate ion exchange while preserving membrane integrity. By optimizing solvent selection (isopropanol) and La³⁺ concentration (0.04–0.05 mol L⁻¹), the modified La-LTA membrane exhibited simultaneous improvements in water flux (up to 12.78 % increase) and separation factor (up to 227 % enhancement), particularly in low-water-content systems. Characterization via SEM, XRD, and XPS confirmed retained crystallinity and successful La³⁺ incorporation (35.42 % exchange degree). The method's universality was validated by exchanging other ions (Li⁺, Cu²⁺, Nd³⁺), with Li-LTA and Nd-LTA membranes also showing dual performance enhancements. This work provides an energy-efficient, scalable strategy to tailor zeolite membranes for industrial dehydration applications.

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NaA沸石膜的快速微波辅助溶剂热La3+离子交换提高乙醇脱水性能

研究人员开发了一种微波辅助溶热法，以实现 NaA 沸石膜中的 La3+ 交换，从而通过渗透蒸发增强乙醇脱水。传统的离子交换过程耗时且有结构退化的风险，而所提出的方法是在微波辐照下利用醇基溶剂加速离子交换，同时保持膜的完整性。通过优化溶剂选择（异丙醇）和 La3+ 浓度（0.04-0.05 mol L-1），改良后的 La-LTA 膜同时提高了水通量（最高提高 12.78%）和分离因子（最高提高 227%），尤其是在低水含量系统中。通过 SEM、XRD 和 XPS 进行的表征证实了结晶度的保持和 La3+ 的成功加入（交换度为 35.42%）。通过交换其他离子（Li+、Cu2+、Nd3+）验证了该方法的通用性，Li-LTA 和 Nd-LTA 膜也显示出双重性能提升。这项工作为工业脱水应用提供了一种节能、可扩展的沸石膜定制策略。

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.