High‐performance molecular‐separation ceramic membranes derived from oxidative cross‐linked polytitanocarbosilane

2020 ◽  
Vol 103 (8) ◽  
pp. 4473-4488 ◽  
Author(s):  
Qing Wang ◽  
Liang Yu ◽  
Hiroki Nagasawa ◽  
Masakoto Kanezashi ◽  
Toshinori Tsuru
Keyword(s):  
High Performance ◽  
Ceramic Membranes ◽  
Molecular Separation

scholarly journals Enhanced Performance of Fly Ash-Based Supports for Low-Cost Ceramic Membranes with the Addition of Bauxite

Membranes ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 711
Author(s):  
Wan Fan ◽  
Dong Zou ◽  
Jingrui Xu ◽  
Xianfu Chen ◽  
Minghui Qiu ◽  
...  
Keyword(s):  
Fly Ash ◽  
High Performance ◽  
Bending Strength ◽  
Ceramic Membrane ◽  
Sintering Temperature ◽  
Low Cost ◽  
Pure Water ◽  
Ceramic Membranes ◽  
Mullite Phase ◽  
Optimum Balance

Support is a necessary foundation for ceramic membranes to achieve high performance. Finding the optimum balance between high performance and low cost is still a significant challenge in the fabrication of ceramic supports. In this study, low-cost fly ash-based ceramic supports with enhanced performance were prepared by the addition of bauxite. The pore structure, mechanical strength, and shrinkage of fly ash/bauxite supports could be tuned by optimizing the bauxite content and sintering temperature. When the sintering temperature and bauxite content were controlled at 1300 °C and 40 wt%, respectively, the obtained membrane supports exhibited a high pure water permeance of approximately 5.36 m3·m−2·h−1·bar−1 and a high bending strength of approximately 69.6 MPa. At the same time, the optimized ceramic supports presented a typical mullite phase and excellent resistance to acid and alkali. This work provides a potential route for the preparation of ceramic membrane supports with characteristics of low cost and high performance.

scholarly journals Bioinspired nano-ordered liquid membrane for precise molecular separation

2020 ◽  
Author(s):  
Haozhen Dou ◽  
Mi Xu ◽  
Baoyu Wang ◽  
Zhen Zhang ◽  
Guobin Wen ◽  
...  
Keyword(s):  
Self Assembly ◽  
High Performance ◽  
Liquid Membrane ◽  
Three Dimensional ◽  
Cellular Membrane ◽  
Liquid Structure ◽  
Long Term Stability ◽  
Separation Membranes ◽  
Molecular Separation

Abstract Cellular membranes provide ideal archetypes for molecule or ion separations with sub-angstrom scale precision, which are featured with both extremely high permeability and selectivity due to the well-defined membrane protein channels. However, the development of bioinspired membranes with artificial channels for sub-angstrom scale ethylene/ethane (0.416 nm / 0.443 nm) separation remains an uncharted territory and a significant challenge. Herein, a bioinspired nano-ordered liquid membrane is constructed by a facile ion/molecule self-assembly strategy for highly efficient ethylene/ethane separation, which mimics the structure of cellular membrane elegantly and possesses plenty of three-dimensional (3D) nanochannels. The elaborate regulation of non-covalent interactions by optimizing the ion/molecule compositions within membrane confers the nano-ordered liquid structure with interpenetrating and bi-continuous apolar domains and polar domains, which results in the formation of regular carrier wires and enormous 3D interconnected ethylene transport nanochannels. By virtue of these 3D nanochannels, the bioinspired nano-ordered liquid membrane manifests simultaneously super-high selectivity, excellent permeance and long-term stability, which exceeds previously reported ethylene/ethane separation membranes. This methodology in this work for construction of bioinspired membrane with tunable 3D nanochannels through ion/molecule self-assembly will enlighten the design and development of high-performance separation membranes for angstrom/sub-angstrom scale ion or molecule separations.

scholarly journals Preparation of a High-Performance Porous Ceramic Membrane by a Two-Step Coating Method and One-Step Sintering

2018 ◽  
Vol 9 (1) ◽  
pp. 52 ◽  
Author(s):  
Zhiwen Hu ◽  
Yulong Yang ◽  
Qibing Chang ◽  
Fengli Liu ◽  
Yongqing Wang ◽  
...  
Keyword(s):  
High Performance ◽  
Ceramic Membrane ◽  
Porous Ceramic ◽  
Ceramic Membranes ◽  
High Viscosity ◽  
Solid Content ◽  
Low Viscosity ◽  
Coating Method ◽  
One Step ◽  
Hole Defects

Hole defects and uneven membrane thicknesses can lead to poor performance, especially in the separation stability of ceramic membranes. This paper uses a one-step sintering method, which avoids hole defects and uneven membrane thicknesses, for the preparation of high-performance and defect-free ceramic membranes. For this purpose, two kinds of ceramic membrane slurry with high or low viscosities were prepared by alumina particles, as raw materials. Both the effects of the two coating process with a one-step coating method for low-viscosity slurry, and the two-step coating method with a high viscosity flush after a low viscosity coating, on the surface properties of a ceramic membrane, were studied in detail. The result shows that the properties of ceramic membranes can be improved by a two-step coating method, with a high viscosity flush after a low viscosity coating, A high-performance and defect-free ceramic membrane was obtained by one-step sintering at 1450 °C for 2 hr with 7 wt % solid content and a coating time of 11 s.

scholarly journals Ultrathin ZSM-5 zeolite nanosheet laminated membrane for high-flux desalination of concentrated brines

2018 ◽  
Vol 4 (11) ◽  
pp. eaau8634 ◽  
Author(s):  
Zishu Cao ◽  
Shixuan Zeng ◽  
Zhi Xu ◽  
Antonios Arvanitis ◽  
Shaowei Yang ◽  
...  
Keyword(s):  
High Performance ◽  
Water Flux ◽  
Dip Coating ◽  
Size Exclusion ◽  
Zeolite Membranes ◽  
Scale Thickness ◽  
Thin Film Sensors ◽  
Aspect Ratios ◽  
Molecular Separation ◽  
Oriented Polycrystalline

The tremendous potential of zeolite membranes for efficient molecular separation via size-exclusion effects is highly desired by the energy and chemical industries, but its practical realization has been hindered by nonselective permeation through intercrystalline spaces and high resistance to intracrystalline diffusion in the conventional zeolite membranes of randomly oriented polycrystalline structures. Here, we report the synthesis of ZSM-5 zeolite nanosheets with very large aspect ratios and nanometer-scale thickness in the preferred straight channel direction. We used these ZSM-5 nanosheets to fabricate ultrathin (<500 nm) laminated membranes on macroporous alumina substrates by a simple dip-coating process and subsequent consolidation via vapor-phase crystallization. This ultrathinb-oriented ZSM-5 membrane has demonstrated extraordinary water flux combined with high salt rejection in pervaporation desalination for brines containing up to 24 weight % of dissolved NaCl. The ZSM-5 nanosheets may also offer opportunities to developing high-performance battery ion separators, catalysts, adsorbents, and thin-film sensors.

Photo-induced sol–gel processing for low-temperature fabrication of high-performance silsesquioxane membranes for use in molecular separation

2015 ◽  
Vol 51 (49) ◽  
pp. 9932-9935 ◽  
Author(s):  
Mai Nishibayashi ◽  
Hiroyuki Yoshida ◽  
Masamoto Uenishi ◽  
Masakoto Kanezashi ◽  
Hiroki Nagasawa ◽  
...  
Keyword(s):  
Low Temperature ◽  
High Performance ◽  
Sol Gel ◽  
Molecular Separation ◽  
Gel Processing

Silsesquioxane (SQ) membranes derived from 3-methacryloxypropyltrimethoxysilane and bis(trimethoxysilyl)ethane were successfully fabricated at low temperature via photo-induced sol–gel processing.

High-Performance Ceramic Membranes with a Separation Layer of Metal Oxide Nanofibers

2007 ◽  
Vol 19 (24) ◽  
pp. 4325-4325 ◽  
Author(s):  
X. B. Ke ◽  
H. Y. Zhu ◽  
X. P. Gao ◽  
J. W. Liu ◽  
Z. F. Zheng
Keyword(s):  
Metal Oxide ◽  
High Performance ◽  
Ceramic Membranes

High-Performance Ceramic Membranes with a Separation Layer of Metal Oxide Nanofibers

2007 ◽  
Vol 19 (6) ◽  
pp. 785-790 ◽  
Author(s):  
X. B. Ke ◽  
H. Y. Zhu ◽  
X. P. Gao ◽  
J. W. Liu ◽  
Z. F. Zheng
Keyword(s):  
Metal Oxide ◽  
High Performance ◽  
Ceramic Membranes

scholarly journals Porous Hydrogen-Bonded Organic Frameworks Membrane for High-Performance Molecular Separation

2021 ◽  
Author(s):  
Xiao-Tian Jiang ◽  
qi Yin ◽  
Bai-tong Liu ◽  
Jun-Yu Chen ◽  
Rui Wang ◽  
...  
Keyword(s):  
High Performance ◽  
Promising Candidate ◽  
Molecular Separation ◽  
Hydrogen Bonded

Hydrogen-bonded organic frameworks (HOFs) with intrinsic, tunable, and uniform pores are promising candidate of membrane for molecular separation but have yet to be explored in this filed. Herein, a type...

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