scholarly journals Supported MXene/GO Composite Membranes with Suppressed Swelling for Metal Ion Sieving

Membranes ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 621
Author(s):  
Zongjie Yin ◽  
Zong Lu ◽  
Yanyan Xu ◽  
Yonghong Zhang ◽  
Liliang He ◽  
...  
Keyword(s):  
Composite Membrane ◽  
Water Purification ◽  
Metal Ion ◽  
High Performance ◽  
Composite Membranes ◽  
Transition Metal Carbide ◽  
Cross Linking ◽  
Metal Carbide ◽  
Ion Exclusion ◽  
The Cross

Novel two-dimensional (2D) membranes have been utilized in water purification or seawater desalination due to their highly designable structure. However, they usually suffer from swelling problems when immersed in solution, which limits their further applications. In this study, 2D cross-linked MXene/GO composite membranes supported on porous polyamide substrates are proposed to improve the antiswelling property and enhance the ion-sieving performance. Transition-metal carbide (MXene) nanosheets were intercalated into GO nanosheets, where the carboxyl groups of GO combined the neighboring hydroxyl terminal groups of MXene with the formation of -COO- bonds between GO and MXene nanosheets via the cross-linking reaction (−OH + −COOH = −COO− + H2O) after heat treatment. The permeation rates of the metal ions (Li+, Na+, K+, Al3+) through the cross-linked MXene/GO composite membrane were 7–40 times lower than those through the pristine MXene/GO membrane. In addition, the cross-linked MXene/GO composite membrane showed excellent Na+ rejection performance (99.3%), which was significantly higher than that through pristine MXene/GO composite membranes (80.8%), showing improved ion exclusion performance. Such a strategy represents a new avenue to develop 2D material-derived high-performance membranes for water purification.

scholarly journals A Facile Method to Control Pore Structure of PVDF/SiO2 Composite Membranes for Efficient Oil/Water Purification

Membranes ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 803
Author(s):  
Qianqian Xu ◽  
Yuchao Chen ◽  
Tonghu Xiao ◽  
Xing Yang
Keyword(s):  
Synergistic Effect ◽  
Pore Structure ◽  
Composite Membrane ◽  
Water Purification ◽  
High Performance ◽  
Composite Membranes ◽  
Water Emulsion ◽  
Emulsion Separation ◽  
Oily Water ◽  
Oil Water

The use of poly(vinylidene fluoride) (PVDF) microfiltration (MF) membranes to purify oily water has received much attention. However, it is challenging to obtain high-performance PVDF microfiltration membranes due to severe surface fouling and rapid decline of permeability. This study explored a new approach to fabricate high-performance PVDF/silica (SiO2) composite membrane via the use of a polymer solution featuring lower critical solution temperature (LCST) characteristics and the non-solvent thermally induced phase separation method (NTIPS). Coupling with morphological observations, the membrane formation kinetics were analyzed in depth to understand the synergistic effect between the LCST solution properties and fabrication conditions in NTIPS. Utilizing such a synergistic effect, the transition from finger-like macrovoid pores to bi-continuous highly connected pores could be flexibly tuned by increasing the PVDF concentration and the weight ratio of SiO2/PVDF in the dope solution and by raising the coagulation temperature to above the LCST of the solution. The filtration experiments with surfactant-stabilized oil-water emulsion showed that the permeation flux of the PVDF/SiO2 composite membranes was higher than 318 L·m−2·h−1·bar−1 and the rejection above 99.2%. It was also shown that the PVDF/SiO2 composite membranes, especially those fabricated above the LCST, demonstrated better hydrophilicity, which resulted in significant enhancement in the anti-fouling properties for oil/water emulsion separation. Compared to the benchmark pure PVDF membrane in oily water purification, the optimal composite membrane T70 was demonstrated via the 3-cycle filtration experiments with a significantly improved flux recovery ratio (Frr) and minimal reduced irreversible fouling (Rir). Overall, with the developed method in this work, facile procedure to tune the membrane morphology and pore structure was demonstrated, resulting in high performance composite membranes suitable for oil/water emulsion separation.

Preparation and Application of Electrospinning Membranes of Thermoplastic Carboxymethyl Cellulose/PLA for Removal of Cu2+ from Aqueous Solutions

2012 ◽  
Vol 724 ◽  
pp. 61-64
Author(s):  
Ying Li ◽  
Xiao Yan Lin ◽  
Zhe Chen ◽  
Xue Guang Luo ◽  
Wei Li Zuo
Keyword(s):  
Tensile Strength ◽  
Aqueous Solutions ◽  
Removal Efficiency ◽  
Composite Membrane ◽  
Carboxymethyl Cellulose ◽  
Contact Time ◽  
Electrospinning Process ◽  
Cross Linking ◽  
Initial Concentration ◽  
The Cross

A composite membrane of thermoplastic carboxymethyl cellulose (TCMC) /PLA was prepared by electrospinning process, and crossliked by epichlorohydrin solution at different temperature. The cross-linking temperature was optimized by characterizing the morphology and tensile strength of the film. The optimal cross-linking temperature was 50°C. A composite membrane was used to remove Cu2+ from aqueous solutions, and the effects of initial concentration of Cu2+ and contact time on the removal efficiency of Cu2+ were investigated. The removal efficiency of Cu2+ was 13.78%, at the initial concentration of 40 mg·L-1 and contact time of 30s.

Plasmonic Transition Metal Carbide Electrodes for High-Performance InSe Photodetectors

ACS Nano ◽  
2019 ◽  
Vol 13 (8) ◽  
pp. 8804-8810 ◽  
Author(s):  
Yajie Yang ◽  
Jaeho Jeon ◽  
Jin-Hong Park ◽  
Mun Seok Jeong ◽  
Byoung Hun Lee ◽  
...  
Keyword(s):  
Transition Metal ◽  
High Performance ◽  
Transition Metal Carbide ◽  
Metal Carbide

The effect of bis allyl benzoxazine on the thermal, mechanical and dielectric properties of bismaleimide–cyanate blend polymers

RSC Advances ◽  
2015 ◽  
Vol 5 (72) ◽  
pp. 58821-58831 ◽  
Author(s):  
Yiqun Wang ◽  
Kaichang Kou ◽  
Guanglei Wu ◽  
Ailing Feng ◽  
Longhai Zhuo
Keyword(s):  
Mechanical Properties ◽  
Dielectric Properties ◽  
Polymer Composite ◽  
High Performance ◽  
Cross Linking ◽  
Thermal And Mechanical Properties ◽  
High Performance Polymer ◽  
The Cross

A high-performance polymer composite was fabricated using Bz-allyl/BMI/BADCy resin, in which the BMI/BADCy resin was modified with Bz-allyl to improve its dielectric, thermal and mechanical properties and the cross-linking degree after curing.

scholarly journals Porous Two-Dimensional Transition Metal Carbide (MXene) Flakes for High-Performance Li-Ion Storage

2016 ◽  
Vol 3 (5) ◽  
pp. 689-693 ◽  
Author(s):  
Chang E. Ren ◽  
Meng-Qiang Zhao ◽  
Taron Makaryan ◽  
Joseph Halim ◽  
Muhammad Boota ◽  
...  
Keyword(s):  
Transition Metal ◽  
High Performance ◽  
Transition Metal Carbide ◽  
Two Dimensional ◽  
Metal Carbide ◽  
Ion Storage ◽  
Li Ion

Back Cover: Porous Two-Dimensional Transition Metal Carbide (MXene) Flakes for High-Performance Li-Ion Storage (ChemElectroChem 5/2016)

2016 ◽  
Vol 3 (5) ◽  
pp. 847-847 ◽  
Author(s):  
Chang E. Ren ◽  
Meng-Qiang Zhao ◽  
Taron Makaryan ◽  
Joseph Halim ◽  
Muhammad Boota ◽  
...  
Keyword(s):  
Transition Metal ◽  
High Performance ◽  
Transition Metal Carbide ◽  
Two Dimensional ◽  
Metal Carbide ◽  
Back Cover ◽  
Ion Storage ◽  
Li Ion

High-performance bioelectrocatalysts created by immobilization of an enzyme into carbon-coated composite membranes with nano-tailored structures

2017 ◽  
Vol 5 (38) ◽  
pp. 20244-20251 ◽  
Author(s):  
Tetsuji Itoh ◽  
Yuuta Shibuya ◽  
Akira Yamaguchi ◽  
Yasuto Hoshikawa ◽  
Osamu Tanaike ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Mesoporous Silica ◽  
Composite Membrane ◽  
High Performance ◽  
Direct Electron Transfer ◽  
Composite Membranes ◽  
Silica Nanotubes ◽  
Carbon Coated

We have achieved direct electron transfer between enzymes and electrodes through establishment of a regular enzyme array by encapsulation it in a carbon-coated composite membrane with mesoporous silica nanotubes (C/F127MST).

scholarly journals Electromagnetic Interference Shielding of 2D Transition Metal Carbide (MXene)/Metal Ion Composites

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2929
Author(s):  
Xuefeng Xia ◽  
Quanlan Xiao
Keyword(s):  
Transition Metal ◽  
Electromagnetic Interference ◽  
Metal Ion ◽  
Absorption Efficiency ◽  
Transition Metal Carbide ◽  
Metal Carbide ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electromagnetic Wave Scattering ◽  
Emi Shielding Effectiveness

In this work, Ti3C2, which has a loosely packed accordion-like structure in transition metal carbide (MXene) form, is fabricated and adsorbed by three metal ions (Fe3+/Co2+/Ni2+). The electromagnetic interference (EMI) shielding performance of Ti3C2 and Ti3C2:Fe3+/Co2+/Ni2+ films is researched in detail, demonstrating that the EMI shielding effectiveness can be improved by adsorbing by Fe3+/Co2+/Ni2+ ions because the metal ion adsorbing can improve the absorption efficiency via electromagnetic wave scattering. The studied Ti3C2:Fe3+/Co2+/Ni2+ films can be used as good EMI shielding materials for communications, electronics, military, and other applications.

Electroactive Polymer Actuator Based on PVDF and Graphene through Electrospinning

2015 ◽  
Vol 1105 ◽  
pp. 311-314 ◽  
Author(s):  
Fan Wang ◽  
Seong Young Ko ◽  
Jong Oh Park ◽  
Suk Ho Park ◽  
Chang Doo Kee
Keyword(s):  
Ionic Conductivity ◽  
Composite Membrane ◽  
High Performance ◽  
Vinylidene Fluoride ◽  
Composite Membranes ◽  
Electroactive Polymer ◽  
High Porosity ◽  
Bending Deformation ◽  
Graphene Membrane ◽  
Polymer Actuator

We report a novel high-performance electroactive polymer actuator based on poly (vinylidene fluoride) (i.e., PVDF) and graphene. The PVDF-graphene composite membranes were fabricated through electrospinning method. The electrospun composite membrane has a three-dimensional network structure, high porosity, and large ionic liquid solution uptake which are a prerequisite for high performance dry-type electroactive soft actuators. The conductive poly (3,4-ethylenedioxythiophene)-poly (styrenesulfonate) (PEDOT:PSS) layers were deposited on the surfaces of the composite membrane through dipping-drying method. The electroactive PVDF-graphene actuators under both harmonic and step electrical inputs show larger bending deformation and faster response time than the pure PVDF actuator. X-ray diffusion (XRD) and ionic conductivity testing results for the PVDF-graphene membrane were compared with those of pristine PVDF. Most important, the PVDF-graphene actuator shows much larger bending deformation under low input voltage, and this could be due to the synergistic effects of the higher ionic conductivity of PVDF-graphene membrane and the electrochemical doping processes of the PEDOT:PSS electrode layers.

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