Electrically conducting nanofiltration membranes based on networked cellulose and carbon nanostructures
Electrically conducting nanofiltration membranes based on networked cellulose and carbon nanostructures
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DOI：
10.1016/j.desal.2016.09.005
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发表时间：
2017-03
期刊：
影响因子：
9.9
通讯作者：
F. Ahmed;B. Lalia;N. Hilal;Raed Hashaikeh
中科院分区：
文献类型：
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作者：
F. Ahmed;B. Lalia;N. Hilal;Raed Hashaikeh
电增强的结垢控制越来越多地应用于基于膜的分离，并且需要具有受控性质的导电膜。在这项工作中，基于网络化纤维素（NC）和碳纳米结构（CNS）的导电膜通过真空过滤制造，然后在40 °C下干燥。对NC-CNS膜的形貌、结构、力学性能和电化学性能进行了表征，并与CNS膜进行了比较。分析了NC的加入对催化剂电催化活性的影响。发现网络化纤维素有助于将水的接触角从105°降低到73°。研究还发现，CNS-NC膜表面亲水性的改善有助于电解过程中电极表面的再生。网状纤维素产生更致密的结构，其拉伸强度超过单独CNS的十倍。通过引入NC使孔结构致密化，转化为二价离子纳滤的有希望的结果，对MgSO 4的截留率为60%，对CaCl 2的截留率为47%，同时保持高通量≥ 100 L m− 2 h − 1，使其适用于RO进料的预处理。
Electrically enhanced fouling control is increasingly applied to membrane-based separation and requires conducting membranes with controlled properties. In this work, electrically conductive membranes based on networked cellulose (NC) and carbon nanostructures (CNS) were fabricated via vacuum filtration, followed by drying at 40 °C. The morphology, structure, mechanical and electrochemical properties of these NC-CNS membranes were characterized and compared with CNS membranes. The effect of incorporating NC on the electrocatalytic activity has been analyzed. It is found that networked cellulose helps to decrease the contact angle of water from 105° to 73°. It is also found that the improved surface hydrophilicity of CNS-NC membrane assists the regeneration of electrode surface during electrolysis process. Networked cellulose yields a more dense structure with the tensile strength exceeding ten times that of CNS alone. The compaction of pore structure via incorporation of NC translates into promising results with respect to nanofiltration of divalent ions, with a rejection efficiency of 60% for MgSO4and 47% for CaCl2, while maintaining a high flux ≥ 100 L m− 2h− 1, making them suitable for pretreatment of RO feeds.