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首页> 外文期刊>Journal of industrial and engineering chemistry >Surface modification of heterogeneous cation exchange membrane through simultaneous using polymerization of PAA and multi walled carbon nano tubes
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Surface modification of heterogeneous cation exchange membrane through simultaneous using polymerization of PAA and multi walled carbon nano tubes

机译：通过同时使用PAA和多壁碳纳米管聚合来对异质阳离子交换膜进行表面改性

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摘要

Polyvinylchloride based heterogeneous cation exchange membrane was modified by using in situ polymerization of polyacrylic acid and multi walled carbon nano tubes simultaneously. Spectra analysis confirmed graft polymerization decisively. SEM images illustrated that grafted-PAA/MWCNTs filled the cracks in membrane by simple gel network entanglement. Ion exchange capacity was improved by PAA/ MWCNTs grafting in modified membranes. Membrane water content was decreased by PAA grafting and then showed increasing trend by using MWCNTs in modifier solution up to 0.1%wt. Water content was decreased again by more MWCNTs loading ratio. Grafted-PAA membranes showed lower membrane potential, transport number, selectivity and flux compared to pristine membrane in sodium chloride ionic solution. These parameters were decreased more by using MWCNTs up to 0.1%wt in modifier solution and then showed increasing trend by more MWCNTs concentration from O.f to 0.3%wt. All mentioned parameters were declined again by more increase in MWCNTs content from 0.3 to 1.0%wt. Results exhibited lower membrane selectivity for the modified membranes compared to pristine ones in bivalent ionic solution. The grafted-PAA/MWCNTs modified membranes also showed lower electrical resistance compared to unmodified ones. Obtained results showed different behavior for permeability in bivalent ionic solution compared to monovalent type.
机译：通过同时使用聚丙烯酸和多壁碳纳米管的原位聚合改性了基于氯乙烯的异质阳离子交换膜。光谱分析证实了接枝聚合。 SEM图像表明，接枝的PAA / MWCNT通过简单的凝胶网络缠结填充了膜中的裂缝。通过在改性膜中接枝PAA / MWCNTs改善了离子交换能力。通过PAA接枝降低了膜的水分含量，然后通过在改性剂溶液中使用高达0.1％wt的MWCNTs呈现出增加的趋势。更高的MWCNTs负载比再次降低了水含量。与原始膜相比，接枝PAA膜在氯化钠离子溶液中显示出较低的膜电位，转运数，选择性和通量。通过在改性剂溶液中使用高达0.1％wt的MWCNT，这些参数会进一步降低，然后随着更多的MWCNTs浓度从O.f到0.3％wt的增加而呈现增加的趋势。 MWCNTs含量从0.3％wt增至1.0％wt，所有上述参数再次下降。结果显示，与原始膜在二价离子溶液中相比，改性膜的膜选择性更低。与未修饰的膜相比，接枝PAA / MWCNTs的膜也显示出较低的电阻。获得的结果表明，与单价类型相比，二价离子溶液中的渗透性行为不同。

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