Zwitterions functionalized multi-walled carbon nanotubes/polyamide hybrid nanofiltration membranes for monovalent/divalent salts separation
Zwitterions functionalized multi-walled carbon nanotubes/polyamide hybrid nanofiltration membranes for monovalent/divalent salts separation
复制标题
用于单价/二价盐分离的两性离子功能化多壁碳纳米管/聚酰胺混合纳滤膜
DOI：
10.1016/j.seppur.2018.05.048
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发表时间：
2018-11-29
影响因子：
8.6
通讯作者：
Gao, Cong-Jie
中科院分区：
文献类型：
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作者：
Guo, Yao-Shen;Mi, Yi-Fang;Gao, Cong-Jie
采用多巴胺和N-氨乙基哌嗪丙烷磺酸盐（AEPPS）共沉积法在多壁碳纳米管（MWCNTs）表面制备了AEPPS-PD@MWCNTs。将AEPPS-PD@MWCNTs与哌嗪水溶液混合，与1，3，5-苯三酰氯（TMC，溶于正己烷溶液）聚合制备带负电荷的纳滤膜，采用傅里叶变换红外光谱、X射线光电子能谱、透射电子显微镜和原子力显微镜对膜进行表征。结果表明，由于AEPPS-PD @ MWCNTs与TMC单体之间存在多重相互作用，使得AEPPS-PD@MWCNTs与聚酰胺基体的相容性增强。在优化条件下，复合膜的纯水渗透率为127.3 L m（-2）h（-1）MPa（-1），是未改性PIP/TMC膜的1.8倍，且对Na_2SO_4的截留率没有降低。同时，杂化膜对NaCl的截留率为19.0%，远低于PIP/TMC膜。杂化膜具有良好的稳定性和抗污染性，可用于一价/二价盐和一价盐/中性有机物的分离，在海水淡化、食品和生物分离等领域具有广阔的应用前景。
N-aminoethyl piperazine propane sulfonate (AEPPS) modified multi-walled carbon nanotubes (MWCNTs) (AEPPS-PD@MWCNTs) were prepared by co-deposition of dopamine and AEPPS on MWCNTs surfaces. AEPPS-PD@MWCNTs were mixed with piperazine aqueous solution and polymerized with 1,3,5-benzenetricarboxylic chloride (TMC, dissolved in hexane solution) to prepare negatively charged NF membranes, which were characterized by Fourier Transform Infrared Spectroscopy, X-ray Photoelectron Spectroscopy, Transmission Electron Microscopy and Atomic Force Microscopy. It was found that compatibility between AEPPS-PD@MWCNTs and polyamide matrix was enhanced as a result of the multiple interactions between AEPPS-PD@MWCNTs and TMC monomers. At optimized conditions, pure water permeability of hybrid membrane was 127.3 L m(-2) h(-1) MPa-1, 1.8 times as high as pristine PIP/TMC membrane without compromising Na2SO4 rejection. Meanwhile, NaCI rejection of hybrid membrane was 19.0%, much lower than pristine PIP/TMC membrane. Hybrid membrane exhibited applications in separation of monovalent/divalent salts and monovalent salts/neutral organics coupled with good stability and better anti-fouling property which was sought for applications in the field of desalination, food and biological separation processes.