CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Lin Li,Kunpeng Yu,Jing Xie,Haixin Sun,Tong Feng,Qinqin Xu,Jianzhong Yin
Graphene has emerged as a highly promising material in the field of membrane separation due to its exceptional properties. However, the challenge of scalable production remains a significant barrier to its widespread application. In this study, we directly used graphene nanosheets (GNs) stripped by supercritical fluid as raw materials to prepare composite membranes with excellent performance. By systematically controlling the intercalation and phase-transition expansion of supercritical CO 2 under the guidance of the established exfoliation theory, a graphene dispersion with a concentration of 2.71 mg∙mL −1 was obtained, which is the highest value reported to date using the supercritical exfoliation (SCE) method. 90 % of the exfoliated GNs are <3 layers, 51 % of GNs exhibiting lateral dimensions >3 μm. The fabricated graphene composite membrane exhibited excellent dye rejection performance, achieving a rejection rate of 99.95 % for Congo red. This method addresses the limitations of conventional liquid-phase exfoliation methods, offering a scalable, cost-effective, and eco-friendly route for the production of graphene and related composite membranes.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Wenbin Zhang,Keyan Yang,Xiangsheng Han,Hongzhen Cai,Wenyu Lu,Yanhao Yuan,Shunyi Zhang,Feng Gao
In this work, the cellulose nanofibers based membranes with both high dye solution flux and rejection rates were obtained. The cellulose nanofibers (PPCNFs) were prepared from pomelo peels by simple H 2 O 2 oxidation process , decorated with ZIF-8 crystals, and vacuum filtrated to form composite membranes (PPCNFs@ZIF x ). Ascribing to the highly porous structures of ZIF-8, as well as their uniform and stable deposition on the surfaces of PPCNFs, the resultant membranes were mechanically strong (tensile strength up to ~72.25 MPa), surface area rich (~ 199.46 m 2 /g), and with a maximal dye solution flux of ~32.3 L m −2 h −1 bar −1 and dye rejection rates larger than 85 % (89.95 % for methyl blue , 98.83 % for methyl violet, 95.91 % for malachite green , 95.36 % for rhodamine 6 G, and a high rejection rate of ~98.6 % toward methyl violet after 30-day cycles). Thus, this work paved a simple and green way to fabricate cellulose nanofibers based membranes with high performance in the remediation of dye contaminated water.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2021
·Vol. 15
·期 4
·892-901
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IF 4.204
Wang Yixing,Dai Liheng,Qu Kai,Qin Lu,Zhuang Linzhou,Yang Hu,Xu Zhi
Photocatalytic membranes have received increasing attention due to their excellent separation and photodegradation of organic contaminants in wastewater. Herein, we bound Ag-AgBr nanoparticles onto a synthesized polyacrylonitrile-ethanolamine (PAN-ETA) membrane with the aid of a chitosan (CS)-TiO 2 layer via vacuum filtration and in-situ partial reduction. The introduction of the CS-TiO 2 layer improved surface hydrophilicity and provided attachment sites for the Ag-AgBr nanoparticles. The PAN-ETA/CS-TiO 2 /Ag-AgBr photocatalytic membranes showed a relatively high water permeation flux (~ 47 L·m −2 ·h −1 ·bar −1 ) and dyes rejection (methyl orange: 88.22%; congo red: 95%; methyl blue: 97.41%; rose bengal: 99.98%). Additionally, the composite membranes exhibited potential long-term stability for dye/salt separation (dye rejection: ~97%; salt rejection: ~6.5%). Moreover, the methylene blue and rhodamine B solutions (20 mL, 10 mg · L −1 ) were degraded approximately 90.75% and 96.81% in batch mode via the synthesized photocatalytic membranes under visible light irradiation for 30 min. This study provides a feasible method for the combination of polymeric membranes and inorganic catalytic materials.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
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IF 4.527
Shilong Li,Wei Gu,Yuqing Sun,Dong Zou,Wenheng Jing
MXene (Ti 3 C 2 T x ) is a novel, two-dimensional (2D) layered material that is atomically thin, exhibits good mechanical strength , and is ideal for fabricating efficient membranes for molecular separation. However, the applications of MXene membranes are limited by their low water permeability owing to narrow channels and high tortuosity. A novel strategy for introducing artificial pores on the surface of MXene nanosheets via gentle in situ chemical etching with hydrogen peroxide (H 2 O 2 ) to prepare porous MXene nanosheets (PMS) is reported herein. This greatly increases the water permeability of MXene membranes while retaining the high rejection of small-molecule dyes. Permeable pores generated on MXene nanosheets transform the transport model of water molecules in the membrane from typical horizontal transport pathways dominated by interlayer channels to longitudinal–lateral three-dimensional transport pathways, affording increased water molecule transport channels and reduced transport distance. Based on different etching conditions, the obtained membranes exhibit high pure-water permeability ranging from 9.37 to 42.48 L m −2 h −1 bar −1 . Moreover, mild etching maintains the 2D structure of the membrane and retains a nearly complete rejection of congo red dye. This study provides a novel and effective strategy for preparing high-performance porous laminar MXene membranes for dye-separation applications.
研究领域:
材料科学
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化学工程
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纳米技术
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Mengying Long,Luhui Yang,Niaz Ali Khan,Chao Yang,Guangwei He,Tao Wu,Dongmin An,Zhongyi Jiang
Covalent organic frameworks (COFs) offer great potential as membrane materials due to their periodic nanopore structure, high porosity, and extensive chemical tunability. However, directly processing crystallized COFs into membranes presents great challenges. To overcome these issues, alternative routes such as polymer blending during membrane formation and their subsequent crystallization offer promising avenues to harness their advantages. In this work, we decoupled the membrane formation and crystallization of COFs processes and introduced a reactive surface segregation method to fabricate COF-based mixed matrix membranes (MMMs). The amine and aldehyde monomers quickly formed an amorphous network at the solvent/non-solvent interface, while polymer matrix separated from the liquid phase to construct membranes during the non-solvent induced phase separation (NIPS) processes. Subsequently, the prepared membranes were heated in acetic acid solution to in-situ crystalize the COF fillers in the MMMs. The peaks at 8.33° and 12.4° assigned to the (110) and (120) reflection planes in the XRD spectrum indicated that the amorphous network was in-situ crystallized. The optimized membrane exhibited a water permeance of 203 L m −2 h −1 bar −1 , over 98.5 % of rejection rates for dyes, and long-term stability for 720 h. This approach creates a new pathway to prepare the advanced COF-based membranes and represents a significant leap forward in the field of membrane technology.
研究领域:
材料科学
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化学工程
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膜技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）