CHEMISTRY OF MATERIALS
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2019
·
IF 10.159
Xiaoxiao Wang,Lizhu Chen,Zhaogang Teng,Zhi-Fei Wang
Mesoporous thin films have been attracting considerable attention due to their potential application in membrane separation technology. However, how to prepare robust mesoporous silica films on a large scale using simple method still remains a great challenge. In this paper, for the first time, we report a facile and novel approach to fabricate layered mesoporous silica thin membrane using mesoporous organosilica nanosheets (mOSiO2 NSs) as the building block, which are prepared by combining template growth and selective etching. Transmission electron microscopy characterization displays that the resulting mOSiO2 NSs possess a large aspect ratio, a controllable thickness (16–27 nm), and a uniform tunable pore size (4–24 nm) by adjusting the reaction conditions. Owing to the large lateral dimension of the nanosheets, the as-prepared mOSiO2 NSs can be easily stacked into a highly packed and oriented membrane via the vacuum filtration. The results show that the nanofilter device based on such mOSiO2 NSs can successfully separate ovalbumin/cytochrome c (OVA/cyt c) or Ag/Au nanoparticles with different sizes, which provides a new strategy for nanosize separation.
研究领域:
材料科学
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生物学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Yilin Shi,Jie Wang,Keru Hou,Chengcheng Li,Chengjian Yao,Xin Dai,Wanli Peng,Zaisheng Cai
Membrane separation materials with special wettability are progressively desired due to economy, high efficiency, and continuous operation. Among them, Janus membrane materials play an important role in controllable oil/water separation with the help of different wettability on each side. However, they still face various challenging problems, such as involvement of toxic chemicals, complexity of the modification process, and poor stability. In this study, based on the yarn functionalization and fabric structure design, double-layer Janus fabric membranes (JF membranes) with hydrophilicity and hydrophobicity were woven on each side of the membranes. The results showed that JF membranes achieved separation efficiency of 99.47 ± 0.35 % and 97.66 ± 0.53 % for light oil/water mixture and heavy oil/water mixture, and the separation flux exceeded 3008.5 L · m −2 · h −1 and 7161.04 L · m −2 · h −1 , respectively. Meanwhile, JF membranes can also separate oil-in-water emulsions (separation efficiency >96.33 %) and water-in-oil emulsions. In addition, JF membranes exhibit desirable chemical stability, mechanical durability and reusability. These results highlight the potential application of JF membranes with asymmetric wettability in oil-water separation and provide a novel, convenient, and feasible strategy for fabricating environmentally friendly membrane separation materials.
研究领域:
材料科学
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环境工程
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膜技术
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分离科学
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2018
·Vol. 28
·期 22
·1800382
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IF 13.325
Jun Wan,Liang Huang,Jiabin Wu,Liukang Xiong,Zhimi Hu,Huimin Yu,Tianqi Li,Jun Zhou
Porous graphene has been widely applied in energy storage, electrocatalysis, photoelectron devices, etc. However, the producing process for porous graphene usually needs long time and is a tedious step. In this work, porous graphene is prepared with controllable pore size by using active metal nanoparticles to catalytically oxidize carbon under microwave combustion process within tens of seconds. The ion exchange membrane based on porous graphene with ≈5 nm pore diameter exhibits a great performance for salinity gradient power generation application with a power density output of ≈1.15 W m −2 . This work highlights a new strategy for the design and synthesis of pore-size-controllable porous graphene and provides new opportunities for 2D porous nanomaterials.
研究领域:
材料科学
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能源技术
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2022
·
IF 4.601
Jiangqi Bai,Qiuyan Zhu,Changwei Tang,Jiawei Liu,Yukun Yi,Quan Bai
High-performance liquid chromatography (HPLC) is a powerful tool to separate and analyze complex samples. Monodiseperse porous silica microspheres (MPSMs) have been widely used as column packings in HPLC. However, synthesis of MPSMs with controllable sizes of both particles and pores for the separation of small solutes and proteins in HPLC still remains a challenge. In this paper, an effective and facile approach to prepare MPSMs with controllable particle size and pore size by using porous polymer microspheres as templates is presented. By employing porous P GMA/EDMA microspheres as templates and tetraethyl orthosilicate (TEOS) as the silica source, 5 μm MPSMs with tunable pore sizes were synthesized successfully. The as-prepared MPSMs were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA), dynamic laser scattering, and mercury intrusion porosimetry. The results indicated that the MPSMs obtained retained the original size of the polymer templating particles and calcination caused almost no shrinkage. Furthermore, the effects of the pore size of polymer template microspheres, different amino-functionalizations of P GMA/EDMA microspheres and the mass ratio of P GMA/EDMA microspheres/TEOS on the pore size of MPSMs were carefully studied. The results indicated that the pore size of MPSMs was adjusted from 20 to 69 nm by controlling the pore size of the polymer microspheres and the mass ratio of P GMA/EDMA microspheres/TEOS in the sol-gel process. In addition, the amino-functionalization of P GMA/EDMA microspheres with different structure-directing agents, such as (3-aminopropyl)triethoxysilane (APTES), trimethylamine hydrochloride (TMA) and tetraethylenepentamine (TEPA), also resulted in MPSMs with the different pore sizes. MPSMs with large pore sizes of more than 30 nm were fabricated by using TEPA-functionalized P GMA/EDMA microspheres as templates, while with TMA-functionalized P GMA/EDMA microspheres as templates, MPSMs with pore sizes of approximately 10 nm were obtained. The as-prepared MPSMs were further modified with different silanes, such as C4, C8 and C18, to explore as stationary phases for the separation of proteins and small solutes in reversed phase liquidi chromatography (RPLC). The results illustrated that the baseline separation of 7 kinds of proteins could be achieved based on MPSMs with pore sizes of 30 nm, and 6 kinds of alkyl benzenes and 5 kinds of aromatic alcohol homologs could be separated completely based on MPSMs with pore sizes of 11 nm. This work demonstrated that MPSMs prepared by applying the polymer templating method showed a promising potential applicability in HPLC.
研究领域:
分析化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2019
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IF 4.527
Xiao-Ru Zhao,Xia Xu,Jie Teng,Nan Zhou,Zhi Zhou,Xin-Yu Jiang,Fei-Peng Jiao,Jin-Gang Yu
Three-dimensional (3D) porous graphene oxide-maize amylopectin (GO-MA) composites with controllable pore-sizes composites in the range of 6–40 nm were prepared by facile hydrothermal-assisted assembly approaches. The morphologies, pore sizes, specific surface area (SSA) and compositions of GO-MA x:y composites with and different GO-to-MA mass ratios (x:y) were characterized by scanning electron microscopy (SEM), N 2 adsorption-desorption isotherms, Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). To reveal the adsorption-desorption mechanism, effects of contact time, temperature, initial adsorbate concentration, pH value of the solution on the adsorption process were studied in detail. The adsorption capacities of 3D GO-MA 20:1 composite for organic contaminants including tert-butyl hydroquinone (TBHQ), p-aminophenol (PAP), p-nitrophenol (PNP), o-nitrophenol (MNP), hydroquinone (HQ), alizarin red S (ARS) and neutral red (NR) were 22.17, 116.4, 44.78, 36.96, 16.10, 39.92 and 24.23 mg g −1 , respectively. The adsorption capacities of GO-MA 30:1 composite for inorganic substances including Pb 2+ , Mn 2+ , Cr 2 O 7 2− , Cd 2+ , Cu 2+ , Nd 3+ , La 3+ , Y 3+ , Yb 3+ and Er 3+ were 84.76, 7.92, 13.6, 17.64, 30.56, 25.52, 12.48, 16.96, 23.32 and 30.32 mg g −1 , respectively. In addition, GO-MA x:y composites also exhibited high mechanical properties and good reusability. Consequently, GO-MA x:y composites could be used as reusable adsorbents for removal/enrichment inorganic/organic substances in aqueous solutions.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2024
·Vol. 59
·期 8
·3561-3572
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IF 3.5
Guo Jie,Wang Wei,Shi Ruhua,Gu Tainyi,Wei Xian,Zhao Jiaqing,Chao Ming,Zhang Qian,Yang Ruizhi
A microporous layer (MPL) with appropriate aperture and hydrophobicity is key for proton-exchange membrane fuel cells (PEMFCs). The MPLs are typically prepared from mixing carbon black and a hydrophobic agent (i.e., polytetrafluoroethylene) physically followed by annealing at elevated temperatures, resulting in pore blockage and carbon black aggregation. To address this issue, we report a facile method to fabricate uniform porous carbons (UPCs) with single aperture and hierarchical porous carbon (HPC) with multiple apertures using a hard silica template followed by chemical grafting with hydrophobic fluoroalkylsilane (FAS-17). An advanced MPL (GMPL) is fabricated by direct layer-by-layer construction of hydrophobic UPC with different apertures, demonstrating improved water drainage and efficient gas transportation, thereby delivering high output power density of 809.64 mW·cm −2 . The as-fabricated GMPL demonstrates superior performance as compared to the one containing MPL prepared with HPC (HPC-MPL, 781.20 mW·cm −2 ) and the ones employing MPL with a single aperture (714.38–749.89 mW·cm −2 ). The controllable gradient aperture, superhydrophobicity, and open pore/channels contribute to the high performance of PFMFC. This work presents a feasible structural design for MPLs toward high-performance PEMFC. Graphical abstract
研究领域:
材料科学
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化学工程
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能源技术
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纳米技术
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电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）