Query:
学者姓名:韦奇
Refining:
Year
Type
Indexed by
Source
Complex
Co-Author
Language
Clean All
Abstract :
3D porous foams for oil-water separation via selective adsorption were obtained by incorporating expanded graphite (EG) granules into polydimethylsiloxane (PDMS) foams. The EG@PDMS6-t foam prepared with a PDMS: EG and NaCl:PDMS mass ratio of 6:1 and 8:1, respectively, possesses a high porosity of 80.3%, a water contact angle of 127.7 degrees, and an oil contact angle close to 0 degrees. The foam exhibits an impressive adsorption capacity towards light oil (hexane,6.28 g/g), heavy oil (trichloromethane, 13.33 g/g), and kitchen waste oil (4.51 g/g), being able to separate 100% of oils from an immiscible oil-water mixture and 39.0% of camellia oil and 45.3% of kitchen waste oil from oil-in-water emulsions via selective adsorption. The foams possess excellent elasticity and desirable reusability in oil-water separation and exhibit outstanding resistance to acidic and alkaline environments. EG accounts for 96.5% of the EG@PDMS6-t foam's volume. SiO2@PDMS hydrophobic layer was constructed on the top of EG@PDMS6-t foams by a spraying technique to tailor-make 3D filters for oil-water gravitydriven separation. The P20s-S0.2-EG@PDMS6-t filter shows an excellent immiscible trichloromethane-water gravity-driven separation, with a trichloromethane permeate flux of 11,024 L/m2h, a water rejection time of 60 s, and a separation efficiency of 99.7%. The filters are highly robust to chemical corrosion and tape-peeling.
Keyword :
Wettability Wettability 3D filter 3D filter Oil-water separation Oil-water separation Emulsion Emulsion Durability Durability
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Wang, Jinghao , Wang, Yali , Yang, Feihua et al. Facile fabrication of expanded graphite/polydimethylsiloxane foams for oil-water separation [J]. | SEPARATION AND PURIFICATION TECHNOLOGY , 2023 , 334 . |
MLA | Wang, Jinghao et al. "Facile fabrication of expanded graphite/polydimethylsiloxane foams for oil-water separation" . | SEPARATION AND PURIFICATION TECHNOLOGY 334 (2023) . |
APA | Wang, Jinghao , Wang, Yali , Yang, Feihua , Cui, Suping , Nie, Zuoren , Wei, Qi . Facile fabrication of expanded graphite/polydimethylsiloxane foams for oil-water separation . | SEPARATION AND PURIFICATION TECHNOLOGY , 2023 , 334 . |
Export to | NoteExpress RIS BibTex |
Abstract :
Asymmetric porous cordierite ceramic membranes were fabricated by phase inversion tape casting method. It is shown that the membranes consist of a relatively dense skin layer on the top, a sponge layer at the bottom and a finger-like layer in the middle. The membranes have a hierarchical pore structure, where macrovoids (denoted as dozens-micron-sized (DMS) pores) are present in the finger-like layer and micron-sized (MS) pores are located in the skin layer, sponge layer and the wall of macrovoids. After surface silylation by post-grafting with 1H,1H,2H,2H-perfluorodecyltriethoxysilane (FAS), the sample with a starting powder/polyethersulfone (PESf) weight ratio of 9 (M - 4) becomes hydrophobic, with a water contact angle of 150 degrees. At a NaCl concentration of 3.5 wt%, a feed rate of 18L/h and a feed temperature of 80 degrees C, the hydrophobic M - 4 membrane exhibits a water permeate flux of 22.33 kg/m(2)h, which is considerably larger than that of the membranes prepared by dry pressing method previously, and a salt rejection of 99.9%. The higher water permeate flux is attributed to the much lower transport resistance of water vapor in the membranes of the present work.
Keyword :
Porous cordierite ceramic membrane Porous cordierite ceramic membrane Asymmetric structure Asymmetric structure Tape casting Tape casting Surface silylation Surface silylation Desalination Desalination
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Teng, Huai-De , Wei, Qi , Wang, Ya-Li et al. Asymmetric porous cordierite ceramic membranes prepared by phase inversion tape casting and their desalination performance [J]. | CERAMICS INTERNATIONAL , 2020 , 46 (15) : 23677-23685 . |
MLA | Teng, Huai-De et al. "Asymmetric porous cordierite ceramic membranes prepared by phase inversion tape casting and their desalination performance" . | CERAMICS INTERNATIONAL 46 . 15 (2020) : 23677-23685 . |
APA | Teng, Huai-De , Wei, Qi , Wang, Ya-Li , Cui, Su-Ping , Li, Qun-Yan , Nie, Zuo-Ren . Asymmetric porous cordierite ceramic membranes prepared by phase inversion tape casting and their desalination performance . | CERAMICS INTERNATIONAL , 2020 , 46 (15) , 23677-23685 . |
Export to | NoteExpress RIS BibTex |
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, alpha-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 degrees C.
Keyword :
silica membrane silica membrane fluorinated fluorinated post-grafting post-grafting hydrophobicity hydrophobicity silylation silylation nonfluorinated alkylsilane nonfluorinated alkylsilane pervaporation pervaporation methyl tert-butyl ether methyl tert-butyl ether
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Wang, Zhaojia , Hao, Liwei , Yang, Feihua et al. Mesoporous Silica Membranes Silylated by Fluorinated and Non-Fluorinated Alkylsilanes for the Separation of Methyl Tert-Butyl Ether from Water [J]. | MEMBRANES , 2020 , 10 (4) . |
MLA | Wang, Zhaojia et al. "Mesoporous Silica Membranes Silylated by Fluorinated and Non-Fluorinated Alkylsilanes for the Separation of Methyl Tert-Butyl Ether from Water" . | MEMBRANES 10 . 4 (2020) . |
APA | Wang, Zhaojia , Hao, Liwei , Yang, Feihua , Wei, Qi . Mesoporous Silica Membranes Silylated by Fluorinated and Non-Fluorinated Alkylsilanes for the Separation of Methyl Tert-Butyl Ether from Water . | MEMBRANES , 2020 , 10 (4) . |
Export to | NoteExpress RIS BibTex |
Abstract :
Mesoporous organosilica membranes were synthesized by sol-gel and dip-coating method using 1,2-bis (triethoxysilyl) ethane (BTESE) as precursor, triblock copolymer poly (ethylene oxide)-block-poly (propylene oxide) block-poly (ethylene oxide) (P123) as surfactant template. After silylated with 1H,1H,2H,2H-perfluorooctyltriethoxysilane (PFOTES,C8) by post-grafting approach, the membranes were used for the separation of hazardous volatile organic compounds (VOCs) from water via pervaporation process. The results show that ethanol-extraction is considerably effective to remove the surfactant template. The membranes show a smooth surface and a sharp pore size distribution centered at 3.5 nm. The hydrophobic property has been enhanced after silylated with PFOTES, leading to a water contact angle of (105 +/- 0.11)degrees. Hydrophobic mesoporous organosilica membranes are selective toward VOCs and show the highest total flux of 0.36 kgm(-2)h(-1) for methyl tert-butyl ether (MTBE) aqueous solution and the highest MTBE/water separation factor of 27.9. The pervaporation performance depends on the affinity between VOCs and grafted C8 groups. Repeated separation experiments reveal that the membranes are durable in aqueous solution due to the presence of water-resistant Si-C bonds within the framework.
Keyword :
Mesoporous organosilica membranes Mesoporous organosilica membranes Volatile organic compounds Volatile organic compounds Hydrophobic Hydrophobic Pervaporation Pervaporation
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | He, Kai-Yue , Wei, Qi , Wang, Ya-Li et al. Hydrophobic mesoporous organosilica membranes: Preparation and application in the separation of volatile organic compounds from water [J]. | MICROPOROUS AND MESOPOROUS MATERIALS , 2019 , 288 . |
MLA | He, Kai-Yue et al. "Hydrophobic mesoporous organosilica membranes: Preparation and application in the separation of volatile organic compounds from water" . | MICROPOROUS AND MESOPOROUS MATERIALS 288 (2019) . |
APA | He, Kai-Yue , Wei, Qi , Wang, Ya-Li , Wang, Shun , Cui, Su-Ping , Li, Qun-Yan et al. Hydrophobic mesoporous organosilica membranes: Preparation and application in the separation of volatile organic compounds from water . | MICROPOROUS AND MESOPOROUS MATERIALS , 2019 , 288 . |
Export to | NoteExpress RIS BibTex |
Abstract :
Organic-inorganic hybrid silica membranes were prepared by sol-gel technique using 1,2-bis (triethoxysilyl)ethane (BTESE) and 1H,1H,2H,2H-perfluorooctyltriethoxysilane (PFOTES) as precursors under acidic condition. The hydrophobic property, sol particle size distribution and pore structure of the modified silica membranes were characterized by contact angle measurement, FT-IR, dynamic light scattering and N-2 adsorption, respectively. The hydrogen permeation, separation and hydrothermal stability of the supported membranes were also investigated in detail. The results show that hydrophobic microporous membranes are obtained after modification by perfluorooctyl groups, with a water contact angle of (110.4 +/- 0.4)degrees and a pore size ranging from 0.5 to 0.8 nm at a PFOTES/BTESE molar ratio of 0.6. At 300 degrees C, the transport of hydrogen in the modified supported hybrid silica membranes complies with a micropore diffusion mechanism, with a high hydrogen permeance of 8.5x10(-7) mol.m(-2).s(-1).Pa-1, a H-2/CO2, H-2/CO and H-2/SF6 permselectivity of 5.49, 5.90 and 18.36, respectively, higher than those of the corresponding Knudsen value. Under a humid condition with a temperature of 250 degrees C and a water vapor molar ratio of 5%, the hydrogen permeance and H-2/CO2 permselectivity of the modified silica membranes remain almost constant, indicative of an excellent hydrothermal stability for the membranes.
Keyword :
hydrothermal stability hydrothermal stability perfluorooctyl groups perfluorooctyl groups organic-inorganic hybrid silica membranes organic-inorganic hybrid silica membranes pore structure pore structure hydrogen separation hydrogen separation
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Liu Xiang-Ge , Wei Qi , Ding Yuan-Li et al. Pore Structure, Hydrogen Separation and Hydrothermal Stability of Hydrophobic Organic-Inorganic Hybrid Silica Membranes Modified by Perfluorooctyl Groups [J]. | CHINESE JOURNAL OF INORGANIC CHEMISTRY , 2014 , 30 (5) : 1111-1118 . |
MLA | Liu Xiang-Ge et al. "Pore Structure, Hydrogen Separation and Hydrothermal Stability of Hydrophobic Organic-Inorganic Hybrid Silica Membranes Modified by Perfluorooctyl Groups" . | CHINESE JOURNAL OF INORGANIC CHEMISTRY 30 . 5 (2014) : 1111-1118 . |
APA | Liu Xiang-Ge , Wei Qi , Ding Yuan-Li , Nie Zuo-Ren , Li Qun-Yan . Pore Structure, Hydrogen Separation and Hydrothermal Stability of Hydrophobic Organic-Inorganic Hybrid Silica Membranes Modified by Perfluorooctyl Groups . | CHINESE JOURNAL OF INORGANIC CHEMISTRY , 2014 , 30 (5) , 1111-1118 . |
Export to | NoteExpress RIS BibTex |
Abstract :
Trifluoropropyl-modified silica membranes were prepared by sol-gel technique using tetraethyl orthosilicate (TEOS) and (trifluoropropyl)trimethoxysilane (TFPTMS) as precursors. The effect of trifluoropropyl modification on the hydrophobic pore structure, properties, hydrogen permeation and separation properties and long-teiiii hydrothermal stability of the modified silica membranes were investigated in detail. The results show that the modified membranes retain a desirable microporous structure with a pore size distributed from 0.45 to 0.7 nm. The hydrophobic property of silica membranes has been considerably enhanced after modification, with a water contact angle of (102.7 degrees +/- 0.1 degrees) at a TFPTMS/TEOS molar ratio of 0.6. The hydrogen transport in the modified silica membranes complies with a micropore diffusion mechanism, with a single H-2 permeance of 4.77x 10(-7) mol.m(-2).s(-1).Pa-1, a H-2/CO2 permselectivity of 6.99 and a H-2/CO2 binary gas mixture separation factor of 6.93 at 300 degrees C, higher than Knudsen permselectivity (4.69). Under a humid condition with a temperature of 200 degrees C and a water vapor molar ratio of 5%, the single H-2 permeance slightly decrease in the first 3 hours and then almost remain constant for at least 220 hours, indicating that the modified membranes are more hydrothermally stable than pure SiO2 membranes.
Keyword :
hydrophobic property hydrophobic property gas separation gas separation sol-gel technique sol-gel technique hydrothermal stability hydrothermal stability silica membrane silica membrane
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Hong Zhi-Fa , Wei Qi , Li Guo-Hua et al. Preparation, H-2 Separation and Hydrothermal Stability of Trifluoropropyl-Modified Silica Membranes [J]. | CHINESE JOURNAL OF INORGANIC CHEMISTRY , 2013 , 29 (5) : 941-947 . |
MLA | Hong Zhi-Fa et al. "Preparation, H-2 Separation and Hydrothermal Stability of Trifluoropropyl-Modified Silica Membranes" . | CHINESE JOURNAL OF INORGANIC CHEMISTRY 29 . 5 (2013) : 941-947 . |
APA | Hong Zhi-Fa , Wei Qi , Li Guo-Hua , Wang Xue-Wei , Nie Zuo-Ren , Li Qun-Yan . Preparation, H-2 Separation and Hydrothermal Stability of Trifluoropropyl-Modified Silica Membranes . | CHINESE JOURNAL OF INORGANIC CHEMISTRY , 2013 , 29 (5) , 941-947 . |
Export to | NoteExpress RIS BibTex |
Abstract :
Organic-inorganic hybrid silica membranes modified with trifluoropropyl groups were synthesized by acid-catalyzed co-hydrolysis and polycondensation reaction of (3,3,3-trifluoropropyl) trimethoxysilane (TFPTMS) and bridged silsesquioxane 1,2-bis(triethoxysilyl) ethane (BTESE) as co-precursors. The effect of trifluoropropyl groups on the sol particle size and the hydrophobic property, the hydrogen permeation and separation behavior and the hydrothermal stability of the obtained membranes were investigated in detail. The results show that trifluoropropyl groups have been successfully incorporated onto the surface of membranes. The sol particle size decreases gradually and hydrophobic properties of the modified silica membranes are enhanced with increasing amount of TFPTMS in the mixture. When the molar ratio of TFPTMS/BTESE increases to 0.6, the organic-inorganic hybrid silica membranes exhibit water contact angles of 111.6 degrees +/- 0.7 degrees and a narrow sol particle size distribution centered at 2.11 nm. The transport of hydrogen in the modified hybrid silica membranes complies with a micropore diffusion mechanism, with a high hydrogen permeance of 8.86x10(-7) mol.m(-2).s(-1).Pa-1, a H-2/CO2 permselectivity of 5.4, and a H-2/CO2 binary gas (molar ratio=1 : 1) separation factor of 4.82 at 300 degrees C, higher than the corresponding Knudsen value (H-2/CO2=4.69). The modified organic-inorganic silica membranes are hydrothermally stable while aging at a humid atmosphere with a temperature of 250 degrees C and a steam concentration of 5% for more than 300 hours.
Keyword :
hydrothermal stability hydrothermal stability organic-inorganic hybrid silica membranes organic-inorganic hybrid silica membranes trifluoropropyl groups trifluoropropyl groups hydrogen separation hydrogen separation
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Wang Xuewei , Wei Qi , Hong Zhifa et al. Preparation, Gas Separation and Hydrothermal Stability Property of Organic-inorganic Hybrid Silica Membranes Modified by Trifluoropropyl Groups [J]. | ACTA CHIMICA SINICA , 2012 , 70 (24) : 2529-2535 . |
MLA | Wang Xuewei et al. "Preparation, Gas Separation and Hydrothermal Stability Property of Organic-inorganic Hybrid Silica Membranes Modified by Trifluoropropyl Groups" . | ACTA CHIMICA SINICA 70 . 24 (2012) : 2529-2535 . |
APA | Wang Xuewei , Wei Qi , Hong Zhifa , Li Qunyan , Nie Zuoren . Preparation, Gas Separation and Hydrothermal Stability Property of Organic-inorganic Hybrid Silica Membranes Modified by Trifluoropropyl Groups . | ACTA CHIMICA SINICA , 2012 , 70 (24) , 2529-2535 . |
Export to | NoteExpress RIS BibTex |
Abstract :
A facile 'one-pot' strategy was reported to synthesize a mesostructured Co/ordered mesoporous carbon (OMC) composite associated with a direct carbonization process from resol, cobalt oxalate and triblock copolymer F127. The obtained materials were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption-desorption and magnetometer measurements. The results show that the mesoporous composites with a low Co content possess an order 2-D hexagonal (p6mm) structure. With the increase of Co content, the order structure of the Co/OMC was gradually broken down. The surface area and pore volume of magnetic OMC will increase with a low Co conten, but they will decrease with the continued increase of the Co content. The cobalt-containing carbons exhibit soft ferromagnetic behavior at ambient temperatures and the magnetization parameters can be adjusted by the content of cobalt.
Keyword :
Block copolymers Block copolymers X ray diffraction X ray diffraction Mesoporous materials Mesoporous materials Cobalt Cobalt Magnetization Magnetization Carbonization Carbonization Carbon Carbon Transmission electron microscopy Transmission electron microscopy
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Sun, He , Wei, Qi , Li, Qun-Yan et al. One-pot synthesis of Co-containing magnetically ordered mesoporous carbons [J]. | Journal of Synthetic Crystals , 2012 , 41 (SUPPL. 1) : 391-396 . |
MLA | Sun, He et al. "One-pot synthesis of Co-containing magnetically ordered mesoporous carbons" . | Journal of Synthetic Crystals 41 . SUPPL. 1 (2012) : 391-396 . |
APA | Sun, He , Wei, Qi , Li, Qun-Yan , Nie, Zuo-Ren . One-pot synthesis of Co-containing magnetically ordered mesoporous carbons . | Journal of Synthetic Crystals , 2012 , 41 (SUPPL. 1) , 391-396 . |
Export to | NoteExpress RIS BibTex |
Abstract :
Hydrophobic organic-inorganic hybrid silica sols were prepared using 1,2-bis(triethoxysilyl) ethane (BTESE) and 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane(PFDTES) as precursors under acidic condition, then the sols were deposited on gamma-Al2O3/alpha-Al2O3 substrates by dip-coating under clean room condition. The cross-sectional morphology, particle size of the sols and hydrophobic property of the membranes were characterized by means of SEM, DLS, FTIR, water contact angle measurement and thermogravimetric analysis. The results show that the particle size of sols and the water contact angle of supported membranes increase with increasing the amount of PFDTES in the mixture. A narrow sol particle size distribution centered at 3.69 nm and a water contact angle of (112.0 +/- 0.4)degrees were obtained at a BTESE/PFDTES molar ratio of 0.25 : 1. At 300 degrees C, the membrane shows a high H-2 permeance of 5.99x10(-7) mol . m(-2) . Pa-1 . s(-1) and a H-2/CO and H-2/CO2 permselectivity of 9.54 and 5.20, respectively, which were higher than the corresponding Knudsen value (H-2/CO=3.74, H-2/CO2 = 4.69). The H-2 transport in the modified silica membranes is subjected to a micropore diffusion mechanism.
Keyword :
Hydrophobic property Hydrophobic property Sol-gel technique Sol-gel technique Gas separation Gas separation Organic-inorganic hybrid silica membrane Organic-inorganic hybrid silica membrane
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Song Lin , Wei Qi , Hao Run-Qiu et al. Preparation and Gas Separation of Organic-inorganic Hybrid Silica Membranes Modified by Perfluorodecyl Group [J]. | CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE , 2012 , 33 (8) : 1670-1675 . |
MLA | Song Lin et al. "Preparation and Gas Separation of Organic-inorganic Hybrid Silica Membranes Modified by Perfluorodecyl Group" . | CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE 33 . 8 (2012) : 1670-1675 . |
APA | Song Lin , Wei Qi , Hao Run-Qiu , Nie Zuo-Ren , Li Qun-Yan . Preparation and Gas Separation of Organic-inorganic Hybrid Silica Membranes Modified by Perfluorodecyl Group . | CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE , 2012 , 33 (8) , 1670-1675 . |
Export to | NoteExpress RIS BibTex |
Abstract :
Organic-inorganic hybrid silica membranes were prepared by sol-gel method with bridged silsesquioxane[1, 2-bis(triethoxysilyl) ethane, BTESE] and phenyltriethoxysilane (PTES) as precursors. The pore structure and hydrophobic property of the hybrid silica membranes were characterized by N2 adsorption, contact angle meter, TG and FTIR. The hydrogen permeation and separation performance was also investigated. The results show that the modified hybrid silica membranes possess a desirable microporous structure with a pore width centered at 0.4-0.6 nm. Such a pore structure can be retained after aging for 30 d under a temperature of 40°C and a relative humidity of 70%-80%. The hybrid silica membranes become hydrophobic after modification, with a water contact angle of (125±0.4)° at a PTES/BTESE molar ratio of 0.6. The transportation of hydrogen in the hybrid silica membranes complies with the activated diffusion mechanism, with a permeance of 8.71×10-7mol·m-2 ·Pa-1·s-1 and a H2/CO2 permselectivity of 5.53.
Keyword :
Hydrogen separation; Organic-inorganic hybrid-SiO2; Phenyl; Pore structure Hydrogen separation; Organic-inorganic hybrid-SiO2; Phenyl; Pore structure
Cite:
Copy from the list or Export to your reference management。
GB/T 7714 | Duan, X.-Y. , Wei, Q. , He, J. et al. Surface modified organic-inorganic hybrid microporous silica membranes for hydrogen separation [J]. | Chemical Journal of Chinese Universities , 2011 , 32 (10) : 2256-2261 . |
MLA | Duan, X.-Y. et al. "Surface modified organic-inorganic hybrid microporous silica membranes for hydrogen separation" . | Chemical Journal of Chinese Universities 32 . 10 (2011) : 2256-2261 . |
APA | Duan, X.-Y. , Wei, Q. , He, J. , Yan, J.-P. , Li, Q.-Y. , Nie, Z.-R. . Surface modified organic-inorganic hybrid microporous silica membranes for hydrogen separation . | Chemical Journal of Chinese Universities , 2011 , 32 (10) , 2256-2261 . |
Export to | NoteExpress RIS BibTex |
Export
Results: |
Selected to |
Format: |