Preparation of Mg-MOF-74 membranes <i>via</i> layer-by-layer seeding and its separation properties

LI Fang; LI Qiming; YU Xiaofei; BAO Xinxia; LIU Haolin; JIA Kun

doi:10.11949/j.issn.0438-1157.20140988

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Preparation of Mg-MOF-74 membranes via layer-by-layer seeding and its separation properties

更新时间：2025-12-16

- Preparation of Mg-MOF-74 membranes via layer-by-layer seeding and its separation properties
- CIESC Journal Issue 3, (1987)
- 作者机构：
  
  1. 辽宁石油化工大学化学化工与环境学部,辽宁,抚顺,113001
  2. 中国科学院煤制乙二醇及相关技术重点实验室,福建,福州,350002
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20140988
  CLC： 614.241
- Online First：25 September 1987，
  
  Published：25 September 1987
- 稿件说明：
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LI Fang, LI Qiming, YU Xiaofei, et al. Preparation of Mg-MOF-74 membranes via layer-by-layer seeding and its separation properties[J]. CIESC Journal, 1987, (3). DOI: 10.11949/j.issn.0438-1157.20140988.
DOI：

LI Fang, LI Qiming, YU Xiaofei, et al. Preparation of Mg-MOF-74 membranes via layer-by-layer seeding and its separation properties[J]. CIESC Journal, 1987, (3). DOI: 10.11949/j.issn.0438-1157.20140988. DOI：

摘要

以2

5-二羟基对苯二甲酸和乙酸镁溶液为原料通过交替浸渍层层组装法在a-Al2O3载体表面预置晶种层

再利用二次生长法制备出连续而致密的Mg-MOF-74晶体膜。采用X射线衍射(XRD)和扫描电镜(SEM)对膜进行了表征。实验结果表明:相比于原位溶剂热合成法

通过2

5-二羟基对苯二甲酸和乙酸镁交替浸渍层层组装法可以增强Mg-MOF-74与氧化铝基体之间的附着效果

提高晶体薄膜的致密性与连续性

实验发现4次交替浸渍层层组装预置晶种可以制备出具有分子筛分性能的Mg-MOF-74晶体膜

单组分气体渗透测试表明其H2/CO2的理想选择性可以达到8.96

高于其努森扩散选择性。XRD测试表明该晶体膜的特征衍射峰与文献报告的粉末MOF-74完全一致

表明Mg-MOF-74晶粒以无取向形式生长于氧化铝载体表面。SEM表征表明Mg-MOF-74晶粒呈麦粒状微观外形

其BET比表面积可以达到1182 m2·g-1。

Abstract

Continuous and dense Mg-MOF-74 membranes were prepared through a combined layer-by-layer seeding assembling and secondary growth method based on 2

5-dihydroxybenzoic acid and magnesium acetate solution. The adhesion between Mg-MOF-74 crystals and a-Al2O3 support could be considerably improved by the alternate immersion assembling of 2

5-dihydroxybenzoic acid and magnesium acetate solution. Compared with the in-situ crystallization technique

Mg-MOF-74 membranes synthesized by four-cycle layer-by-layer method exhibited improved molecule-sieving properties due to optimized membrane continuity and density. Single gas test indicated that the best Mg-MOF-74 membrane had H2/CO2 ideal selectivity as high as 8.96

higher than its Knudsen diffusion selectivity. XRD measurement proved that the XRD patterns of Mg-MOF-74 membranes were consistent with those of powdered Mg-MOF-74 from published papers

which implied that our membranes were composed of randomly oriented MOF-74 crystals. SEM characterization showed that the MOF-74 crystals possessed wheat-shaped morphology and specific BET surface area as high as 1182 m2·g-1.

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Preparation of Mg-MOF-74 membranes via layer-by-layer seeding and its separation properties

DOI：10.11949/j.issn.0438-1157.20140988

摘要

Abstract

关键词

Keywords

references