JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Shuaijun Yu,Hao Qian,Junbin Liao,Jun Dong,Lu Yu,Chunhong Liu,Jiangnan Shen
Recovery of sulfuric acid from industrial wastewater via electrodialysis (ED) has become a hot topic recently. Since the commercially used anion exchange membranes (AEM) generally lead to the severe proton leakage during ED process, the efficiency of the acid recovery was seriously affected. In this work, a series of proton blockage cross-linking AEM has been prepared by modifying poly(vinylidene fluoride- co -hexafluoropropylene) (PVDF- co -HFP) with 1-vinylimidazole, followed by crosslinking with 1,4-dibromobutane. Our investigation demonstrates that the as-prepared PVDF- co -HFP-based AEM has the observable asymmetric structure on the two sides of the AEM with a smooth and dense surface and a rough and porous surface. The asymmetric structure and the hydrophobicity of the fluorinated backbone of AEM render the improved proton blocking performance, and the increased electrical efficiency and reduced energy consumption of acid recovery. For example, the optimized AEM (AEM-0.5) exhibits the acid concentration with the values of c H + = 2.04 M (initial proton concentration: 1.0 M) in concentrate cell during 12 h-ED process at current density of 20 mA cm −2 and low energy consumption of 1.75 kw·h·kg −1 relative to the commercial NEOSEPTA® AHA and proton blockage ACM AEM. It is believed that this study can provide a guideline for designing advanced proton blocking AEMs.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
Materials
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2020
·Vol. 13
·期 4
·933
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IF 3.057
Yuexuan Li,Yugang Duan,Chengmeng Wang
Graphene has been regarded as one of the most promising two-dimensional nanomaterials. Even so, graphene was still faced with several key issues such as impedance mismatching and narrow bandwidth, which have hindered the practical applications of graphene-based nanocomposites in the field of microwave absorption materials. Herein, a series of Si-modified rGO@Fe3O4composites were investigated and fabricated by a simple method. On one hand, the degree of defects in graphene carbon could be tuned by different silane coupling reagents, which were beneficial to enhancing the dielectric loss. On the other hand, the spherical Fe3O4nanoparticles provided the magnetic loss resonance, which contributed to controlling the impedance matching. Subsequently, the electromagnetic absorption (EMA) properties of Si-modified rGO@Fe3O4composites with poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-co-HFP) were investigated in this work. As a result, the Si(2)-rGO@Fe3O4/PVDF-co-HFP composite exhibited the excellent EMA performance in the range of 2–18 GHz. The maximum reflection loss (RLmax) reached −32.1 dB at 3.68 GHz at the thickness of 7 mm and the effective absorption frequency bandwidth for reflection loss (RL) below −10 dB was 4.8 GHz at the thickness of 2 mm. Furthermore, the enhanced absorption mechanism revealed that the high-efficiency absorption performance of Si(2)-rGO@Fe3O4/PVDF-co-HFP composite was attributed to the interference absorption (quarter-wave matching model) and the synergistic effects between Si(2)-rGO@Fe3O4and PVDF-co-HFP. This work provides a potential strategy for the fabrication of the high-performance EMA materials.Keywords:absorbing materials;Si-modified rGO@Fe3O4/PVDF-co-HFP composites;dielectric loss;magnetic loss;electromagnetic properties
研究领域:
材料科学
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电磁学
✓ 已验证
DOI
PubMed
高影响因子
Physica Status Solidi-Rapid Research Letters
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2018
·Vol. 12
·期 10
·1800319
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IF 3.721
Bismark Boateng,Gaolong Zhu,Weiqiang Lv,Dongjiang Chen,Chao Feng,Muhammad Waqas,Shamshad Ali,Kechun Wen,Weidong He
A highly uniform, heterogeneous-phase composite separator is synthesized by a direct post-solidation process from the mixture of nano-SiO 2 /acetone monodisperse suspension and poly(vinylidene fluoride- co -hexafluoropropylene) (PVDF- co -HFP)/acetone gel, without any organic surfactants. This technique leads to the PVDF- co -HFP/SiO 2 composite separator outstanding microstructural uniformity. The incorporation of SiO 2 nanoparticles leads to reduced crystallinity (≈27%), enhanced wettability (≈14%), improved electrolyte uptake (≈420%), and enhanced mechanical strength (>14 MPa) of the composite separator. These enhanced properties of the separator translate into remarkable LiFePO 4 /Li battery performance with reduced polarization, a high room-temperature capacity of 165 mAh g −1 at 0.5 C, a high thermal dimensional stability (≈4.5% shrinkage after annealing at 160 °C for 1 h) and 5.2% capacity degradation after 1500 charge/discharge cycles at 2 C.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Environmental Technology & Innovation
·
2024
·
IF 6.7
Bo Sun,Xiaona Pan,Yu Tian,Wenlong Bi,Menglin Feng,Fenwu Liu,Qingjie Hou
Microbial fuel cells (MFCs) represent a promising clean energy technology with significant application potential. However, their implementation is constrained by the limitations of current membrane materials. Polyvinylidene fluoride-hexafluoropropylene (PVDF-co-HFP) is a material that has garnered interest in the field of electrochemical systems because of its facile moldability into various shapes and sizes of membranes, positioning it as a highly promising alternative to high-cost commercial membranes. Nevertheless, enhancing its electrochemical characterization remains a pivotal challenge to be surmounted for its broad adoption. In this study, an efficient PVDF-co-HFP membrane, augmented with PP13-TFSI ionic liquid and sulfonation (Membrane P-I&S), was successfully synthesized, and its potential as an ion exchange membrane in MFCs was evaluated. The findings indicated that chlorosulfonic acid considerably enhances the hydrophilicity and proton transport properties of PVDF-co-HFP, with the ionic liquid posited as an effective means to augment the sulfonation effect. An MFCs incorporating Membrane P-I&S demonstrated a remarkable current production capacity and power density, exceeding those of the unmodified membrane by more than two and threefold, respectively. In addition, the MFCs based on Membrane P-I&S displayed prolonged cycling stability with a notably porous architecture and enhanced biofouling resistance. This study validates the development of a high-efficiency, cost-effective, and environmentally friendly membrane fabrication approach for application in bioelectrochemical systems. This will help promote the application of MFCs in the field of wastewater treatment and resource recovery.
研究领域:
环境科学
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生物电化学
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材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）