{"title":"用于分离 SO2/N2 的可逆 MOF 基混合基质膜：光响应方法","authors":"Qingping Xin , Jiakang Dong , Wei Shao , Xiaoli Ding , Ningning Gao , Lei Zhang , Huimin Jin , Hao Chen , Yuzhong Zhang","doi":"10.1016/j.memsci.2024.123431","DOIUrl":null,"url":null,"abstract":"<div><div>Fuel consumption for industrial development, SO<sub>2</sub> gas emissions are increasing year by year and have become a focal point of air pollution. Membrane separation method photo-responsive materials and MOFs have attracted more and more attention in a variety of fields. This is because the membrane separation method uses less energy and is an uncomplicated process; MOFs have superior gas adsorption capabilities; and the photo-responsive materials are controllable. In this study, mixed matrix membranes are prepared using Uio-66-NH<sub>2</sub> and photo-responsive materials CE-Azo-Uio-66 as fillers and Pebax as base membranes. By improving the dissolution-diffusion mechanism for SO<sub>2</sub> gas molecules, SO<sub>2</sub>/N<sub>2</sub> gas separation is accomplished. More channels for the mass transport of SO<sub>2</sub> gas through the membrane can be created by MOFs increased porosity and larger specific surface area. Secondly, the SO<sub>2</sub> adsorption and dissolution-diffusion mechanism of the mixed matrix membrane are strengthened by the grafted SO<sub>2</sub> affinity groups on the MOF. Moreover, Pebax/CE-Azo-Uio-66 membranes is not only significantly more permeation selective than Pebax/Uio-66-NH<sub>2</sub> membranes, but also shows photo-responsive characteristic. The SO<sub>2</sub> permeability and selectivity of Pebax/CE-Azo-Uio-66 mixed matrix membranes at CE-Azo-Uio-66 content of 20 % are increased by 191 % and 179 %, respectively, compared to pure Pebax membranes. It is also found that the SO<sub>2</sub> permeability and SO<sub>2</sub>/N<sub>2</sub> selectivity of the membranes show regularly reversible changes at the UV–Vis photoconversion conditions of Pebax/CE-Azo-Uio-66-20 % membranes, indicating the photo-responsive characteristics of mixed matrix membranes that include Azo groups. The SO<sub>2</sub> permeability of the Pebax/CE-Azo-Uio-66 membrane is increased by 1300 Barrer and the SO<sub>2</sub>/N<sub>2</sub> selectivity is increased by 350 when the light source is changed from UV to Vis light, achieving a controlled separation of SO<sub>2</sub>/N<sub>2</sub>. Besides, the addition of MOF particles significantly enhances the mechanical properties and stability of the membrane.</div></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":"714 ","pages":"Article 123431"},"PeriodicalIF":8.4000,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Reversible MOF-Based mixed matrix membranes for SO2/N2 separation: A photo-responsive approach\",\"authors\":\"Qingping Xin , Jiakang Dong , Wei Shao , Xiaoli Ding , Ningning Gao , Lei Zhang , Huimin Jin , Hao Chen , Yuzhong Zhang\",\"doi\":\"10.1016/j.memsci.2024.123431\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Fuel consumption for industrial development, SO<sub>2</sub> gas emissions are increasing year by year and have become a focal point of air pollution. Membrane separation method photo-responsive materials and MOFs have attracted more and more attention in a variety of fields. This is because the membrane separation method uses less energy and is an uncomplicated process; MOFs have superior gas adsorption capabilities; and the photo-responsive materials are controllable. In this study, mixed matrix membranes are prepared using Uio-66-NH<sub>2</sub> and photo-responsive materials CE-Azo-Uio-66 as fillers and Pebax as base membranes. By improving the dissolution-diffusion mechanism for SO<sub>2</sub> gas molecules, SO<sub>2</sub>/N<sub>2</sub> gas separation is accomplished. More channels for the mass transport of SO<sub>2</sub> gas through the membrane can be created by MOFs increased porosity and larger specific surface area. Secondly, the SO<sub>2</sub> adsorption and dissolution-diffusion mechanism of the mixed matrix membrane are strengthened by the grafted SO<sub>2</sub> affinity groups on the MOF. Moreover, Pebax/CE-Azo-Uio-66 membranes is not only significantly more permeation selective than Pebax/Uio-66-NH<sub>2</sub> membranes, but also shows photo-responsive characteristic. The SO<sub>2</sub> permeability and selectivity of Pebax/CE-Azo-Uio-66 mixed matrix membranes at CE-Azo-Uio-66 content of 20 % are increased by 191 % and 179 %, respectively, compared to pure Pebax membranes. It is also found that the SO<sub>2</sub> permeability and SO<sub>2</sub>/N<sub>2</sub> selectivity of the membranes show regularly reversible changes at the UV–Vis photoconversion conditions of Pebax/CE-Azo-Uio-66-20 % membranes, indicating the photo-responsive characteristics of mixed matrix membranes that include Azo groups. The SO<sub>2</sub> permeability of the Pebax/CE-Azo-Uio-66 membrane is increased by 1300 Barrer and the SO<sub>2</sub>/N<sub>2</sub> selectivity is increased by 350 when the light source is changed from UV to Vis light, achieving a controlled separation of SO<sub>2</sub>/N<sub>2</sub>. Besides, the addition of MOF particles significantly enhances the mechanical properties and stability of the membrane.</div></div>\",\"PeriodicalId\":368,\"journal\":{\"name\":\"Journal of Membrane Science\",\"volume\":\"714 \",\"pages\":\"Article 123431\"},\"PeriodicalIF\":8.4000,\"publicationDate\":\"2024-10-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Membrane Science\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0376738824010251\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Membrane Science","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0376738824010251","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
Reversible MOF-Based mixed matrix membranes for SO2/N2 separation: A photo-responsive approach
Fuel consumption for industrial development, SO2 gas emissions are increasing year by year and have become a focal point of air pollution. Membrane separation method photo-responsive materials and MOFs have attracted more and more attention in a variety of fields. This is because the membrane separation method uses less energy and is an uncomplicated process; MOFs have superior gas adsorption capabilities; and the photo-responsive materials are controllable. In this study, mixed matrix membranes are prepared using Uio-66-NH2 and photo-responsive materials CE-Azo-Uio-66 as fillers and Pebax as base membranes. By improving the dissolution-diffusion mechanism for SO2 gas molecules, SO2/N2 gas separation is accomplished. More channels for the mass transport of SO2 gas through the membrane can be created by MOFs increased porosity and larger specific surface area. Secondly, the SO2 adsorption and dissolution-diffusion mechanism of the mixed matrix membrane are strengthened by the grafted SO2 affinity groups on the MOF. Moreover, Pebax/CE-Azo-Uio-66 membranes is not only significantly more permeation selective than Pebax/Uio-66-NH2 membranes, but also shows photo-responsive characteristic. The SO2 permeability and selectivity of Pebax/CE-Azo-Uio-66 mixed matrix membranes at CE-Azo-Uio-66 content of 20 % are increased by 191 % and 179 %, respectively, compared to pure Pebax membranes. It is also found that the SO2 permeability and SO2/N2 selectivity of the membranes show regularly reversible changes at the UV–Vis photoconversion conditions of Pebax/CE-Azo-Uio-66-20 % membranes, indicating the photo-responsive characteristics of mixed matrix membranes that include Azo groups. The SO2 permeability of the Pebax/CE-Azo-Uio-66 membrane is increased by 1300 Barrer and the SO2/N2 selectivity is increased by 350 when the light source is changed from UV to Vis light, achieving a controlled separation of SO2/N2. Besides, the addition of MOF particles significantly enhances the mechanical properties and stability of the membrane.
期刊介绍：
The Journal of Membrane Science is a publication that focuses on membrane systems and is aimed at academic and industrial chemists, chemical engineers, materials scientists, and membranologists. It publishes original research and reviews on various aspects of membrane transport, membrane formation/structure, fouling, module/process design, and processes/applications. The journal primarily focuses on the structure, function, and performance of non-biological membranes but also includes papers that relate to biological membranes. The Journal of Membrane Science publishes Full Text Papers, State-of-the-Art Reviews, Letters to the Editor, and Perspectives.
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