Development of a binarization analysis technique and characteristic for mixed-matrix pervaporation membranes

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED

Microporous and Mesoporous Materials Pub Date : 2024-09-11 DOI:10.1016/j.micromeso.2024.113332

Shinya Nishiyama , Naomichi Kimura , Yuri Ito , Tomoya Hirai , Keizo Nakagawa , Tomohisa Yoshioka

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Abstract

Pervaporation (PV) is considered a promising energy-efficient process for recovering ethanol from fermentation liquids. In this study, ethanol separation characteristics were elucidated using mixed-matrix pervaporation membranes composed of hydrophobic polymers (PDMS) and high-silica ZSM-5 (HSZ). The selectivity and flux of ethanol/water were both improved when HSZ content in PDMS matrices was increased — at 50 wt% HSZ content the selectivity reached 15 and the flux of ethanol was improved to 0.05 kg/m²/hr. A new method was demonstrated to quantify the local thickness of the PDMS matrices by cross-sectional SEM binarization and inscribed circle analysis. PDMS matrices became more uniform with an increase in the HSZ content. The uniform presence of the PDMS matrices can be interpreted as more uniform dispersion of HSZ particles. An increase in total length of PDMS-HSZ interface resulted in improved ethanol permeability. NMR analysis showed that the molecular mobility of PDMS was restricted. Those results suggest an increase in the physical interaction between PDMS and HSZ. This study demonstrated a new analytical method for understanding the local thickness of the PDMS matrices and the interfacial state of mixed-matrix pervaporation membranes.

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开发混合基质渗透膜的二值化分析技术和特性

透气蒸发（PV）被认为是从发酵液中回收乙醇的一种很有前景的节能工艺。在这项研究中，使用由疏水聚合物（PDMS）和高硅 ZSM-5 （HSZ）组成的混合基质渗透蒸发膜阐明了乙醇分离特性。当 PDMS 基质中的 HSZ 含量增加时，乙醇/水的选择性和通量均得到改善--当 HSZ 含量为 50 wt% 时，选择性达到 15，乙醇的通量提高到 0.05 kg/m2/hr。通过截面 SEM 二值化和内切圆分析，展示了一种量化 PDMS 基质局部厚度的新方法。随着 HSZ 含量的增加，PDMS 基质变得更加均匀。PDMS 基质的均匀存在可以解释为 HSZ 颗粒的分散更加均匀。PDMS-HSZ 界面总长度的增加提高了乙醇渗透性。核磁共振分析表明，PDMS 的分子流动性受到了限制。这些结果表明 PDMS 和 HSZ 之间的物理相互作用增强了。这项研究为了解 PDMS 基质的局部厚度和混合基质透汽膜的界面状态提供了一种新的分析方法。

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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.