Dalam kajian ini, novel PVC kation pertukaran membran dan matrix campuran membran berasaskan PVC telah dibuat pada komposisi resin pertukaran kation dan bahan tambahan yang berbeza, ciri-ciri dan prestasi mereka telah diuji dengan menggunakan kaedah elektrokimia impedans spektroskopi. Karbon tube nano telah digunakan sebagai bahan tambahan dalam campuran pembuatan matriks campuran membran. Kepekatan resin yang digunakan dalam matrix campuran membran ditentukan dari pencirian dan prestasi resin polimer tulen. Ia telah didapati bahawa pengambilan air daripada membran polimer tulen telah dipertingkatkan manakala pengambilan air matrix campuran membran bertambah baik dengan peningkatan nanopartikel tetapi pada komposisi tertinggi, pengambilan air telah dikurangkan. Sudut sentuhan air telah dikurangkan apabila komposisi resin dan bahan tambahan meningkat tetapi pada komposisi resin dan bahan tambahan yang paling tertinggi, sudut sentuhan air telah meningkat. Kapasiti pertukaran ion telah dipertingkatkan apabila kepekatan resin meningkat, tetapi hanya sehingga peratusan 8%. Membran dengan peratusan 8% komposisi resin memiliki kapasiti tertinggi pertukaran ion yang dengan itu ia telah dipilih untuk menjadi asas kepada komposisi resin dalam pembuatan matrix campuran membran. Kapasiti pertukaran ion telah dikurangkan apabila kepekatan bahan tambahan meningkat kerana jumlah yang tinggi bahan tambahan yang memenuhi ruang di sekitar zarah resin. Kekonduksian ion telah dipertingkatkan apabila komposisi resin dan bahan tambahan meningkat, tetapi tiba-tiba menyebabkan pengurangan apabila resin dan kepekatan bahan tambahan adalah di komposisi yang tertinggi. Kekonduksian ion meningkat daripada ((2.99 to 4.72) Ω−1cm−1) dengan meningkatnya komposisi bahan tambahan kepada membran. elektrokimia impedans spektroskopi ialah alat yang sangat baik untuk mengkaji sifat elektroimia of ion pertukaran membran.
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In this study, novel PVC cation exchange membrane (CEM) and PVC-based mixed matrix membrane were fabricated at different cation exchange resin (CER) and additive concentration, characterized and their performance were tested by using Electrochemical Impedance Spectroscopy (EIS) method. Multi walled carbon nanotubes (MWCNT) was employed as additive in mixed matrix membrane fabrication. CER concentration used in the mixed matrix membranes were determined from the characterization and performance of pure polymeric CER. It was found that water uptake of the CER-CEM was enhanced while the water uptake of MWCNT-CEM was improved with the increasing of nanoparticles but at the highest loading of MWCNT, the water uptake was reduced. Water contact angle was reduced as the CER and MWCNT concentration increases but at high loading of CER and MWCNT, water contact angle was increased. Ion exchange capacity was enhanced as the CER concentration increased, but only up to 8%wt. Membrane with the 8%wt CER loading possessed the highest ion exchange capacity thus it was chosen to be the base of amount of CER in the fabrication of mixed matrix membrane. Ion exchange capacity was reduced as the MWCNT concentration increased due to the high amount of MWCNT that occupied the spaces around CER particles. The ion conductivity was enhanced when the CER loading and MWCNT increased, but suddenly resulting in reduction when CER and MWCNT concentration were at their highest. Ionic conductivity increased from (2.99 to 4.72) Ω−1cm−1 with the addition of MWCNT to the membrane. ElS is an excellent tool to investigate the electrochemical properties of IEM.
Heterogenous cation exchange membrane- fabrication, characterization and performance studies using electrochemical impedance spectroscopy / Nor Adibah Ahmad