Collaborative Research: High-performance water purification membranes made of 2D zeolite nanosheets

合作研究：二维沸石纳米片制成的高性能水净化膜

• 批准号: 1705284
• 负责人: Dongxia Liu
• 金额: $ 15万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-07-01 至 2022-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1705284&HistoricalAwards=false
• 关键词: Collaborative; Research; performance; water; purification

Collaborative Proposal PI: Baoxia Mi/Dongxia LiuProposal Number: 1706059/1705284 Clean water production has become a global challenge as the world water demand is approaching the available fresh water supply. Membrane technology holds great promise for solving this problem by supplying fresh water through purification of nontraditional sources such as seawater, brackish water, and wastewater. Typically, polymeric semi-permeable membranes have been used in the purification process. Polymeric membranes are effective in removing salt from water, but they suffer from membrane fouling, low chlorine tolerance, and low water permeability, leading to high capital and maintenance costs. A focus of this project is to overcome these problems by developing a next-generation membrane using a novel 2-dimensional (2-D) zeolite nanomaterial. High-performance zeolite membranes may have other applications in other areas, such as point-of-use water treatment, renewable energy production, and drug delivery. The educational activities particularly target K-12 female students, underrepresented minority groups, and the general public. Both the diversity of students in engineering careers and the public interest in science and technology will be enhanced. The knowledge gained from this project may help guide the design of new processes to help resolve the global water crisis. The Principle Investigators plan to exploit the unique properties of 2-D zeolite nanosheets as radically new materials to make high-performance membranes for water purification. One problem impeding zeolite membranes from realizing their potential in water purification applications is the difficulty of achieving high zeolite loading in the synthesized membrane; therefore, developing highly efficient strategies to drastically increase zeolite loading without sacrificing membrane mechanical strength or structural integrity will be a research focus. The PIs take a novel interdisciplinary approach that: (1) exploits the emerging 2-D zeolite nanosheets that have a higher external surface area, more surface functional groups, and a unique flexible shape, all of which will lead to much enhanced physicochemical properties of membranes when compared with those generated by 3-D zeolite nanoparticles used in all previous studies; (2) customizes a layer-by-layer technique that will ideally assemble the 2-D zeolite nanosheets into an ultra-thin zeolite membrane with extremely high loading and significantly improved performance in water purification; and (3) performs a thorough investigation to elucidate the underlying mechanisms for the water/contaminant transport and to evaluate the potential in-situ regeneration and long-term stability of the novel zeolite membranes. Compared with traditional polyamide or previous zeolite-polymer nanocomposite membranes, the zeolite nanosheet membrane will offer many significant advantages including: (1) higher zeolite loading, (2) higher water permeability, (3) improved fouling control through in-situ regeneration, and (4) improved chemical stability. The PIs investigate the structure/function of the zeolite nanosheet membrane and the water and solute transport in these novel zeolite membranes.

合作提案PI：宝霞米/东峡刘提案编号：1706059/1705284清洁水生产已成为一个全球性挑战，因为世界水需求已接近可用的淡水供应。膜技术通过净化海水、微咸水和废水等非传统来源提供淡水，为解决这一问题带来了巨大的希望。通常，在提纯过程中使用了聚合物半透膜。聚合物膜可以有效地去除水中的盐分，但它们存在膜污染、耐氯性低、透水性差等问题，导致投资和维护成本较高。本项目的一个重点是通过开发使用新型二维(2D)沸石纳米材料的下一代膜来克服这些问题。高性能沸石膜可能在其他领域也有其他应用，如使用点水处理、可再生能源生产和药物输送。教育活动特别针对K-12年级的女学生、代表性不足的少数群体和普通公众。工程专业学生的多样性和公众对科学技术的兴趣都将得到加强。从该项目中获得的知识可能有助于指导新流程的设计，以帮助解决全球水危机。原理研究人员计划利用2-D沸石纳米片的独特性能作为全新的材料来制造高性能的净水膜。阻碍沸石膜发挥其在水净化应用中的潜力的一个问题是难以在合成的膜中实现高沸石负载量，因此，开发高效的策略在不牺牲膜的机械强度或结构完整性的情况下大幅提高沸石负载量将是一个研究热点。PI采用了一种新颖的跨学科方法：(1)利用新兴的二维沸石纳米片具有更高的外表面积、更多的表面官能团和独特的柔性形状，所有这些都将导致膜的物理化学性质比以前所有研究中使用的3D沸石纳米颗粒产生的膜的物理化学性质大大增强；(2)定制一种逐层技术，该技术将理想地将二维沸石纳米片组装成具有极高负载并显著改善净水性能的超薄沸石膜；以及(3)进行深入的研究，以阐明水/污染物传输的潜在机制，并评估新型沸石膜的潜在的原位再生和长期稳定性。与传统的聚酰胺或以前的沸石-聚合物纳米复合膜相比，沸石纳米片膜具有许多显著的优点，包括：(1)更高的沸石负载量，(2)更高的透水率，(3)通过原位再生改善污染控制，(4)改善化学稳定性。PI研究了沸石纳米片膜的结构和功能，以及水和溶质在这些新型分子筛膜中的迁移。

项目成果

Synthesis of hierarchical lamellar MFI zeolites with sequential intergrowth influenced by synthetic gel composition

• DOI: 10.1016/j.micromeso.2018.08.007
• 发表时间: 2019-02
• 期刊: Microporous and Mesoporous Materials
• 影响因子: 5.2
• 作者: L. Emdadi;Dat T. Tran;Emily Schulman;Lu Wei;Wenjin Shang;Huiyong Chen;Dongxia Liu

Three-step cascade over a single catalyst: synthesis of 5-(ethoxymethyl)furfural from glucose over a hierarchical lamellar multi-functional zeolite catalyst

• DOI: 10.1039/c8ta01242c
• 发表时间: 2018-05-07
• 期刊: JOURNAL OF MATERIALS CHEMISTRY A
• 影响因子: 11.9
• 作者: Bai, Yuanyuan;Wei, Lu;Liu, Dongxia
• 通讯作者: Liu, Dongxia

Local environment and catalytic property of External Lewis acid sites in hierarchical lamellar titanium Silicalite-1 zeolites

• DOI: 10.1016/j.micromeso.2020.110710
• 发表时间: 2021-02
• 期刊: Microporous and Mesoporous Materials
• 影响因子: 5.2
• 作者: Wei Wu;Dat T. Tran;Sichao Cheng;Y. Zhang;Na Li;Huiyong Chen;Y. Chin;Libo Yao;Dongxia Liu

Mesopore differences between pillared lamellar MFI and MWW zeolites probed by atomic layer deposition of titania and consequences on photocatalysis

• DOI: 10.1016/j.micromeso.2018.10.009
• 发表时间: 2019-03
• 期刊: Microporous and Mesoporous Materials
• 影响因子: 5.2
• 作者: Junyan Zhang;Zheng Lu;Wei Wu;Dat T. Tran;Wenjin Shang;Huiyong Chen;Y. Lei;Zhenglong Li;Mei Wang;T. Woehl;Dongxia Liu

A mixed matrix membrane for enhanced CO2/N2 separation via aligning hierarchical porous zeolite with a polyethersulfone based comb-like polymer

• DOI: 10.1016/j.jtice.2021.10.032
• 发表时间: 2021-11
• 期刊: Journal of the Taiwan Institute of Chemical Engineers
• 影响因子: 5.7
• 作者: Yunfei Yu;Chenchen Zhang;Jiufeng Fan;Dongxia Liu;Jianqiang Meng