1
|
Kim HJ, Kim SJ, Lee K, Foster RI. A short review on hydrophobic pervaporative inorganic membranes for ethanol/water separation applications. KOREAN J CHEM ENG 2022. [DOI: 10.1007/s11814-022-1173-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
2
|
Wang L, Yang J. Zirconia-Doped Methylated Silica Membranes via Sol-Gel Process: Microstructure and Hydrogen Permselectivity. NANOMATERIALS 2022; 12:nano12132159. [PMID: 35808001 PMCID: PMC9268422 DOI: 10.3390/nano12132159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 06/06/2022] [Accepted: 06/20/2022] [Indexed: 02/06/2023]
Abstract
In order to obtain a steam-stable hydrogen permselectivity membrane, with tetraethylorthosilicate (TEOS) as the silicon source, zirconium nitrate pentahydrate (Zr(NO3)4·5H2O) as the zirconium source, and methyltriethoxysilane (MTES) as the hydrophobic modifier, the methyl-modified ZrO2-SiO2 (ZrO2-MSiO2) membranes were prepared via the sol-gel method. The microstructure and gas permeance of the ZrO2-MSiO2 membranes were studied. The physical-chemical properties of the membranes were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscope (SEM), and N2 adsorption–desorption analysis. The hydrogen permselectivity of ZrO2-MSiO2 membranes was evaluated with Zr content, temperature, pressure difference, drying control chemical additive (glycerol) content, and hydrothermal stability as the inferred factors. XRD and pore structure analysis revealed that, as nZr increased, the MSiO2 peak gradually shifted to a higher 2θ value, and the intensity gradually decreased. The study found that the permeation mechanism of H2 and other gases is mainly based on the activation–diffusion mechanism. The separation of H2 is facilitated by an increase in temperature. The ZrO2-MSiO2 membrane with nZr = 0.15 has a better pore structure and a suitable ratio of micropores to mesopores, which improved the gas permselectivities. At 200 °C, the H2 permeance of MSiO2 and ZrO2-MSiO2 membranes was 3.66 × 10−6 and 6.46 × 10−6 mol·m−2·s−1·Pa−1, respectively. Compared with the MSiO2 membrane, the H2/CO2 and H2/N2 permselectivities of the ZrO2-MSiO2 membrane were improved by 79.18% and 26.75%, respectively. The added amount of glycerol as the drying control chemical additive increased from 20% to 30%, the permeance of H2 decreased by 11.55%, and the permselectivities of H2/CO2 and H2/N2 rose by 2.14% and 0.28%, respectively. The final results demonstrate that the ZrO2-MSiO2 membrane possesses excellent hydrothermal stability and regeneration capability.
Collapse
Affiliation(s)
| | - Jing Yang
- Correspondence: ; Tel.: +86-29-62779357
| |
Collapse
|
3
|
Xia J, Yang J, Zhang H, Guo Y, Zhang R. Microstructure and Hydrothermal Stability of Microporous Niobia-Silica Membranes: Effect of Niobium Doping Contents. MEMBRANES 2022; 12:membranes12050527. [PMID: 35629853 PMCID: PMC9143021 DOI: 10.3390/membranes12050527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 05/08/2022] [Accepted: 05/13/2022] [Indexed: 11/16/2022]
Abstract
Methyl-modified niobium-doped silica (Nb/SiO2) materials with various Nb/Si molar ratios (nNb) were fabricated using tetraethoxysilane and methyltriethoxysilane as the silica source and niobium pentachloride as the niobium source by the sol–gel method, and the Nb/SiO2 membranes were prepared thereof by the dip-coating process under an N2 calcining atmosphere. Their microstructures were characterized and gas permeances tested. The results showed that the niobium element existed in the formation of the Nb-O groups in the Nb/SiO2 materials. When the niobium doping content and the calcining temperature were large enough, the Nb2O5 crystals could be formed in the SiO2 frameworks. With the increase of nNb and calcination temperature, the formed particle sizes increased. The doping of Nb could enhance the H2/CO2 and H2/N2 permselectivities of SiO2 membranes. When nNb was equal to 0.08, the Nb/SiO2 membrane achieved a maximal H2 permeance of 4.83 × 10−6 mol·m−2·Pa−1·s−1 and H2/CO2 permselectivity of 15.49 at 200 °C and 0.1 MPa, which also exhibited great hydrothermal stability and thermal reproducibility.
Collapse
Affiliation(s)
- Jiachen Xia
- School of Urban Planning and Municipal Engineering, Xi’an Polytechnic University, Xi’an 710048, China; (J.X.); (Y.G.); (R.Z.)
| | - Jing Yang
- School of Urban Planning and Municipal Engineering, Xi’an Polytechnic University, Xi’an 710048, China; (J.X.); (Y.G.); (R.Z.)
- Correspondence:
| | - Hao Zhang
- Xi’an Thermal Power Research Institute Co., Ltd., Xi’an 710032, China;
| | - Yingming Guo
- School of Urban Planning and Municipal Engineering, Xi’an Polytechnic University, Xi’an 710048, China; (J.X.); (Y.G.); (R.Z.)
| | - Ruifeng Zhang
- School of Urban Planning and Municipal Engineering, Xi’an Polytechnic University, Xi’an 710048, China; (J.X.); (Y.G.); (R.Z.)
| |
Collapse
|
4
|
A Methyl-Modified Silica Layer Supported on Porous Ceramic Membranes for the Enhanced Separation of Methyl Tert-Butyl Ether from Aqueous Solution. MEMBRANES 2022; 12:membranes12050452. [PMID: 35629778 PMCID: PMC9144733 DOI: 10.3390/membranes12050452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 04/15/2022] [Accepted: 04/21/2022] [Indexed: 12/04/2022]
Abstract
As a kind of volatile organic compound (VOC), methyl tert-butyl ether (MTBE) is hazardous to human health and destructive to the environment if not handled properly. MTBE should be removed before the release of wastewater. The present work supported the methyl-modified silica layer (MSL) on porous α-Al2O3 ceramic membranes with methyltrimethoxysilane (MTMS) as a precursor and pre-synthesized mesoporous silica microspheres as dopants by the sol-gel reaction and dip-coating method. MTMS is an environmentally friendly agent compared to fluorinated alkylsilane. The MSL-supported Al2O3 ceramic membranes were used for MTBE/water separation by pervaporation. The NMR spectra revealed that MTMS evolves gradually from an oligomer to a highly cross-linked methyl-modified silica species. Methyl-modified silica species and pre-synthesized mesoporous silica microspheres combine into hydrophobic mesoporous MSL. MSL makes the α-Al2O3 ceramic membranes transfer from amphiphilic to hydrophobic and oleophilic. The MSL-supported α-Al2O3 ceramic membranes (MSL-10) exhibit an MTBE/water separation factor of 27.1 and a total flux of 0.448 kg m−2 h−1, which are considerably higher than those of previously reported membranes that are modified by other alkylsilanes via the post-grafting method. The mesopores within the MSL provide a pathway for the transport of MTBE molecules across the membranes. The presence of methyl groups on the external and inner surface is responsible for the favorable separation performance and the outstanding long-term stability of the MSL-supported porous α-Al2O3 ceramic membranes.
Collapse
|
5
|
Wu Y, Zeng J, Zeng Y, Zhou H, Liu G, Jian J, Ding J. Polyethersulfone-polyvinylpyrrolidone composite membranes: Effects of polyvinylpyrrolidone content and polydopamine coating on membrane morphology, structure and performances. Chin J Chem Eng 2021. [DOI: 10.1016/j.cjche.2020.09.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
6
|
Lu HT, Li W, Miandoab ES, Kanehashi S, Hu G. The opportunity of membrane technology for hydrogen purification in the power to hydrogen (P2H) roadmap: a review. Front Chem Sci Eng 2020; 15:464-482. [PMID: 33391844 PMCID: PMC7772061 DOI: 10.1007/s11705-020-1983-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Accepted: 07/05/2020] [Indexed: 11/24/2022]
Abstract
The global energy market is in a transition towards low carbon fuel systems to ensure the sustainable development of our society and economy. This can be achieved by converting the surplus renewable energy into hydrogen gas. The injection of hydrogen (⩽10% v/v) in the existing natural gas pipelines is demonstrated to have negligible effects on the pipelines and is a promising solution for hydrogen transportation and storage if the end-user purification technologies for hydrogen recovery from hydrogen enriched natural gas (HENG) are in place. In this review, promising membrane technologies for hydrogen separation is revisited and presented. Dense metallic membranes are highlighted with the ability of producing 99.9999999% (v/v) purity hydrogen product. However, high operating temperature (⩾300 °C) incurs high energy penalty, thus, limits its application to hydrogen purification in the power to hydrogen roadmap. Polymeric membranes are a promising candidate for hydrogen separation with its commercial readiness. However, further investigation in the enhancement of H2/CH4 selectivity is crucial to improve the separation performance. The potential impacts of impurities in HENG on membrane performance are also discussed. The research and development outlook are presented, highlighting the essence of upscaling the membrane separation processes and the integration of membrane technology with pressure swing adsorption technology.
![]()
Collapse
Affiliation(s)
- Hiep Thuan Lu
- Department of Chemical Engineering, The University of Melbourne, Parkville, VIC 3010 Australia.,Department of Animal, Plant and Soil Sciences, La Trobe University, Bundoora, VIC 3086 Australia.,Australian Research Council (ARC) Research Hub for Medicinal Agriculture, La Trobe University, Bundoora, VIC 3086 Australia
| | - Wen Li
- Department of Chemical Engineering, The University of Melbourne, Parkville, VIC 3010 Australia
| | - Ehsan Soroodan Miandoab
- Department of Chemical Engineering, The University of Melbourne, Parkville, VIC 3010 Australia
| | - Shinji Kanehashi
- Graduate School of Engineering, Tokyo University of Agriculture and Technology, Tokyo, 184-8588 Japan
| | - Guoping Hu
- Department of Chemical Engineering, The University of Melbourne, Parkville, VIC 3010 Australia.,Fluid Science & Resources Division, Department of Chemical Engineering, the University of Western Australia, Crawley, WA 6009 Australia
| |
Collapse
|
7
|
Mesoporous Silica Membranes Silylated by Fluorinated and Non-Fluorinated Alkylsilanes for the Separation of Methyl Tert-Butyl Ether from Water. MEMBRANES 2020; 10:membranes10040070. [PMID: 32326643 PMCID: PMC7231391 DOI: 10.3390/membranes10040070] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 04/09/2020] [Accepted: 04/12/2020] [Indexed: 11/17/2022]
Abstract
It is of great significance to separate hazardous methyl tert-butyl ether (MTBE) from water in terms of environmental protection and human health. In the present work, α-Al2O3-suppotred silica membranes were prepared by the sol-gel and dip-coating technique. Two fluorinated alkylsilanes (1H,1H,2H,2H-perfluorooctyltriethoxysilane (PFOTES) and trifluoropropyltriethoxysilane (TFPTES)) and two non-fluorinated alkylsilanes (octyltriethoxysilane (OTES) and propyltriethoxysilane (PTES)) were adopted to silylate the silica membrane by the post-grafting method which is used for the separation of MTBE from water by pervaporation. The results show that silylation enhances the hydrophobicity of silica membranes. The silylated silica membranes are selective towards MTBE, and the MTBE/water separation factor varies with grafting agents in the order: PFOTES > TFPTES > OTES > PTES. Membranes silylated with fluorinated carbon chains seem to be more selective towards MTBE than those with non-fluorinated carbon chains. The total flux is proportional to the pore volume of silica membranes, which depends on grafting agents in the order: PTES > PFOTES > OTES > TFPTES. Considering both total flux and selectivity, the PFOTES-SiO2 membrane is most effective in separation, with a MTBE/water separation factor of 24.6 and a total flux of 0.35 kg m-2 h-1 under a MTBE concentration of 3.0% and a feed temperature of 30 °C.
Collapse
|
8
|
Tudu BK, Sinhamahapatra A, Kumar A. Surface Modification of Cotton Fabric Using TiO 2 Nanoparticles for Self-Cleaning, Oil-Water Separation, Antistain, Anti-Water Absorption, and Antibacterial Properties. ACS OMEGA 2020; 5:7850-7860. [PMID: 32309694 PMCID: PMC7160840 DOI: 10.1021/acsomega.9b04067] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Accepted: 03/20/2020] [Indexed: 05/03/2023]
Abstract
Superhydrophobicity is of interest for practical applications such as water repellency, self-cleaning, stain resistance, antibacterial properties, and oil-water separation. In this work, a superhydrophobic coating on cotton fabric is prepared by simple immersion in TiO2 nanoparticles and perfluorodecyltriethoxysilane solution. Its antiwetting properties, surface morphology, and functionality are characterized. The cotton fabric shows superhydrophobicity with a water static contact angle of 169.3 ± 2.1° and tilt angle of 6.3 ± 2.0°. The coating is also characterized by performing stability tests, and it shows excellent mechanical durability, chemical stability, and thermal stability. Additionally, the water droplet dynamic on the coated surface is also studied. The coated cotton fabric exhibits excellent self-cleaning, stain resistance, rust stain resistance, anti-water absorption, and antibacterial properties. It can also be used in oil-water separation with a high separation efficiency and excellent reusability.
Collapse
|
9
|
Tudu BK, Kumar A, Bhushan B. Fabrication of superoleophobic cotton fabric for multi-purpose applications. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2019; 377:20190129. [PMID: 31177954 DOI: 10.1098/rsta.2019.0129] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 04/02/2019] [Indexed: 05/19/2023]
Abstract
Superoleophobicity is of interest for practical applications such as liquid repellency, self-cleaning, stain resistance, anti-bacterial properties and oil-water separation. In this work, the superoleophobic coating on cotton fabric was applied by simple immersion in TiO2 nanoparticles, perfluorodecyltriethoxysilane and tertraethylorthosilicate solution. Its anti-wetting properties, surface morphology and functionality were characterized. The coated cotton fabric shows superoleophobicity with oil (surface tension more than 27 mN m-1) contact angle of 152° and tilt angle of 6°. Furthermore, the superoleophobic cotton fabric was demonstrated to exhibit self-cleaning, stain resistance, mechanical durability, chemical stability, thermal stability, anti-bacterial properties and oil-water separation capabilities. This article is part of the theme issue 'Bioinspired materials and surfaces for green science and technology (part 2)'.
Collapse
Affiliation(s)
- Balraj K Tudu
- 1 Department of Chemical Engineering, Indian Institute of Technology (Indian School of Mines) Dhanbad , Jharkhand 826004 , India
| | - Aditya Kumar
- 1 Department of Chemical Engineering, Indian Institute of Technology (Indian School of Mines) Dhanbad , Jharkhand 826004 , India
| | - Bharat Bhushan
- 2 Nanoprobe Laboratory for Bio- and Nanotechnology and Biomimetics, The Ohio State University , 201 West 19th Avenue, Columbus, OH 43210-1142 , USA
| |
Collapse
|
10
|
Effect of calcination atmosphere on microstructure and H2/CO2 separation of palladium-doped silica membranes. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2018.08.041] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
11
|
Su Y, Liu Y, Liu T, Wang X. Fabrication of dual‐layer poly(styrene‐
b
‐4‐vinyl pyridine)–poly(vinylidene fluoride) membranes with tailored pore sizes under 10 nm via surface quaternization. J Appl Polym Sci 2018. [DOI: 10.1002/app.47137] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Y. Su
- Beijing Key Laboratory of Membrane Materials and Engineering, Department of Chemical EngineeringTsinghua University Beijing 100084 People's Republic of China
| | - Y. Liu
- Aerospace Research Institute of Special Material and Processing TechnologyChina Aerospace Science and Industry Corp. Beijing 100074 People's Republic of China
| | - T. Liu
- Beijing Key Laboratory of Membrane Materials and Engineering, Department of Chemical EngineeringTsinghua University Beijing 100084 People's Republic of China
| | - X. Wang
- Beijing Key Laboratory of Membrane Materials and Engineering, Department of Chemical EngineeringTsinghua University Beijing 100084 People's Republic of China
| |
Collapse
|
12
|
Zhu L, Wang Y, Cui S, Yang F, Nie Z, Li Q, Wei Q. Preparation of Silica Aerogels by Ambient Pressure Drying without Causing Equipment Corrosion. Molecules 2018; 23:molecules23081935. [PMID: 30072663 PMCID: PMC6222790 DOI: 10.3390/molecules23081935] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Revised: 07/30/2018] [Accepted: 07/31/2018] [Indexed: 11/16/2022] Open
Abstract
The silica aerogels were prepared via a sol-gel technique and ambient pressure drying by using industrial solid wastes, dislodged sludges, as raw materials. A strategy was put forward to reduce the corrosion of equipment during the drying procedure. The pore structure, hydrophobicity, and thermal insulation property of the obtained samples were investigated in detail. The results show that the corrosion can be effectively avoided by using an equimolar mixture of trimethylchlorosilane (TMCS) and hexamethyldisilazane (HMDS) as silylation agents. At a Si:TMCS:HMDS molar ratio of 1:0.375:0.375, the silica aerogels possess a desirable pore structure with a pore volume of 3.3 ± 0.1 cm³/g and a most probable pore size of 18.5 nm, a high hydrophobicity with a water contact angle of 144.2 ± 1.1°, and a low thermal conductivity of 0.031 ± 0.001 W/(m∙K).
Collapse
Affiliation(s)
- Lixiao Zhu
- College of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China.
| | - Yali Wang
- College of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China.
| | - Suping Cui
- College of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China.
| | - Feihua Yang
- State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing 100024, China.
| | - Zuoren Nie
- College of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China.
| | - Qunyan Li
- College of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China.
| | - Qi Wei
- College of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China.
| |
Collapse
|
13
|
Cardoso SP, Azenha IS, Lin Z, Portugal I, Rodrigues AE, Silva CM. Inorganic Membranes for Hydrogen Separation. SEPARATION AND PURIFICATION REVIEWS 2017. [DOI: 10.1080/15422119.2017.1383917] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Simão P Cardoso
- CICECO––Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Ivo S Azenha
- CICECO––Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Zhi Lin
- CICECO––Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Inês Portugal
- CICECO––Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Alírio E Rodrigues
- Associate Laboratory LSRE––Laboratory of Separation and Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, University of Porto, Porto, Portugal
| | - Carlos M Silva
- CICECO––Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| |
Collapse
|
14
|
|