• 멤브레인
• /
• 제14권1호
• /
• pp.26-36
• /
• 2004

상전환 방법으로 제조된 음이온 성 Poly(his[4-(3-aminophenoxy)phenyl]sulfone pyromellite)imide(ACPI) 한외여과막의 순수 투과유속과 용질 배재도 측정치로 투과성능을 연구하였다. ACPI 한외여과막의 투과성능은 캐스팅 용액의 조성과 막 제조 및 측정조건에 영향을 받았다. Bovine serum albumin (BSA) 용액을 pH 2.5-9.0 상태에서 ACPI 한외여과 막의 상대투과유속과 membrane filtration index (MFI) 측정한 결과 BSA의 등전점에서 멀어 질수록 상대투과유속은 증가하고 막 오염정도를 나타내는 MFI는 감소하였다. 또한, 친수성인 ACPI 한외여과막의 이온교환용량(IEC)이 증가할수록 상대투과유속은 증가하고, MFI는 감소하였다.

• Membrane and Water Treatment
• /
• 제8권3호
• /
• pp.259-277
• /
• 2017

Adsorption is a widely used technique for the removal of dyes from wastewaters by variety of adsorbents. In this work, the main focus is on the potential assessment of anion exchange membrane for the removal of different dyes using batch system and investigation of experimental data by applying various kinetic and thermodynamic models. The removal of anionic dyes i.e., Eosin-B, Eriochrome Black-T and Congo Red by anion exchange membrane BII from aqueous solution was carried out and effect of various parameters such as contact time, membrane dosage, temperature and ionic strength on the percentage removal of anionic dyes was studied. The experimental data was assessed by kinetic models namely pseudo-first-order, pseudo-second-order, Elovich liquid film diffusion, Bangham and the modified Freundlich models equation have been used to analyze the experimental data. These results indicate that the adsorption of these anionic dyes on BII follows pseudo-second-order kinetics with maximum values of regression coefficient (0.992-0.998) for all the systems. The adsorption of dyes was more suitable to be controlled by a liquid film diffusion mechanism. The adsorptive removal of dye Eosin-B and Eriochrome Black-T were decreased with temperature and thermodynamic parameters such as free energy (${\Delta}G^o$), enthalpy (${\Delta}H^o$) and entropy (${\Delta}S^o$) for adsorption of dyes on membrane BII were calculated at 298 K, 308 K and 318 K. The values of enthalpy and entropy were negative for EB and EBT representing that the adsorption of these dyes on BII is physiosorptive and exothermic in nature. Whereas the positive values of enthalpy and entropy for CR adsorption on BII, indicating that its adsorption is endothermic and spontaneous in nature. It is evident from this study that anion exchange membrane has shown good potential for the removal of dyes from aqueous solution and it can be used as adsorbent for dues removal on commercial levels.

• Membrane and Water Treatment
• /
• 제3권1호
• /
• pp.63-76
• /
• 2012

Mother liquid discharged from a salt-manufacturing plant was electrodialyzed at 25 and $40^{\circ}C$ in a continuous process integrated with $SO_4{^{2-}}$ ion low-permeable anion-exchange membranes to remove $Na_2SO_4$ and recover NaCl in the mother liquid. Performance of electrodialysis was evaluated by measuring ion concentration in a concentrated solution, permselectivity coefficient of $SO_4{^{2-}}$ ions against $Cl^-$ ions, current efficiency, cell voltage, energy consumption to obtain one ton of NaCl and membrane pair characteristics. The permselectivity coefficient of $SO_4{^{2-}}$ ions against $Cl^-$ ions was low enough particularly at $40^{\circ}C$ and $SO_4{^{2-}}$ transport across anion-exchange membranes was prevented successfully. Applying the overall mass transport equation, $Cl^-$ ion and $SO_4{^{2-}}$ ion transport across anion-exchange membranes is evaluated. $SO_4{^{2-}}$ ion transport number is decreased due to the decrease of electro-migration of $SO_4{^{2-}}$ ions across the anion-exchange membranes. $SO_4{^{2-}}$ ion concentration in desalting cells becomes higher than that in concentration cells and $SO_4{^{2-}}$ ion diffusion is accelerated across the anion-exchange membranes from desalting cells toward concentrating cells.

• 한국수소및신에너지학회논문집
• /
• 제33권1호
• /
• pp.28-37
• /
• 2022

In this study, we synthesized a poly(pheneylene oxide) (PPO)-based organic/inorganic composite membrane having silicotungstic acid (STA) for the development of an anion exchange membrane with excellent ionic conductivity and physicochemical stability. The organic/inorganic composite membranes were prepared by introducing different STA contents (0 wt%, 10 wt%, 30 wt%, and 50 wt%) into the quaternizaed(Q)-PPO matrix. The prepared anion exchange membranes were subjected to structural analysis by proton neclear magnetic resonance and Fourier transform infrared, and thermal behavior of membranes was confirmed by thermogravimetric analysis. Among the prepared composite membranes, the ion conductivity of Q-PPO/STA-50 (40.5 mS cm^-1) showed 1.46 times compared to that of the pristine membrane (27.6 mS cm^-1). Therefore, these results demonstrated that organic/inorganic composite membranes are promising candidates for application of anion exchange membranes.

• 멤브레인
• /
• 제31권4호
• /
• pp.275-281
• /
• 2021

알칼리 수전해용 격막으로 사용가능성을 평가하기 위해 5종류의 상용 음이온교환막의 열적안정성, 이온전도도, 내구성을 평가하였다. TGA (thermo-gravimetric analysis)로 분석한 열적안정성은 FAAM-PK-75와 FAAM-40 막이 다른 3종류의 AEM, AHO, AHA 막과 비교하여 좋은 성능을 보였다. 25℃와 80℃, 7 M KOH 수용액에서의 이온전도도는 AEM막이 다른 막과 비교하여 약 4~17배 높은 값을 보였다. 25℃, 7 M KOH 수용액에서 측정한 내구성은 FAAM-PK-75막이 다른 막과 비교하여 안정하였다.

• 멤브레인
• /
• 제25권6호
• /
• pp.515-523
• /
• 2015

상업적으로 이용되는 폴리스티렌계 이온교환막은 제조 공정이 쉽고 간단하지만 막이 가지는 취성 때문에 내구성이 약하다는 단점을 가지고 있다. 이를 보완하기 위하여 친수성 그룹인 poly(ethylene glycol)을 곁사슬로 가지고 있는 poly(ethylene glycol)methyl ether methacrylate를 공중합시켜 음이온 교환막을 합성하였다. 지지체로는 내화학성 및 기계적 강도가 우수한 다공성 PE 지지체를 사용하였고, 여기에 다양한 조성의 vinylbenzyl chloride, styrene, poly(ethylene glycol)methyl ether methacrylate, divinylbenzene, benzoyl peroxide를 녹인 단량체 용액을 지지체 기공에 채운 뒤 열중합 가교시켜 trimethylamine을 이용하여 음이온 교환기를 도입해 세공충전 음이온 교환막을 합성하였다. 또한 poly(ethylene glycol)methyl ether methacrylate의 곁사슬 길이와 각 단량체가 차지하는 비율의 변화가 음이온 교환막의 전기화학적 특성에 미치는 영향을 알아보았다.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2006년도 춘계학술대회
• /
• pp.77-80
• /
• 2006

Chloromethylated polysulfone(CMPSf) and a number of mono- and diamine compounds were used to prepare anion-exchange membranes(AEMs) and an ionomer binder solution. The properties of the AEMs were investigated such as $OH^-$ conductivity, water content and dimension stability. Chloromethylation and amination of PSf were optimized in terms of the properties. Membrane-electrode assemblies were fabricated using anion-exchange membranes and the ionomer binder for solid alkaline fuel cells and direct borohydride fuel cells.

• 폴리머
• /
• 제36권5호
• /
• pp.564-572
• /
• 2012

본 연구에서는 막축전식 탈염(membrane capacitive deionization, MCDI) 공정용 음이온교환막의 제조를 위하여 vinylbenzyl chloride-co-ethyl methacrylate-co-styrene(VBC-EMA-St) 공중합체를 합성하였으며, 아민화 반응과 열처리를 통하여 음이온교환막을 제조하였다. 구조확인을 위하여 FTIR 분석을 하였고, GPC와 TGA를 통하여 합성한 고분자의 분자량과 분자분포, 열안정성을 분석하였으며, 함수율 및 이온교환용량을 측정하였다. 또한 LCR meter로 전기저항을 측정하고, MCDI 공정에 적용하기 위하여 제조한 음이온교환막을 충방전 시험 측정하였다. 이온교환용량, 함수율, 전기저항, 분자량은 각각 1.69 meq/g, 23.7%, 1.61 ${\Omega}{\cdot}cm$, $3.4{\times}10^4$ g/mol이었으며, CDI 충방전 시험 결과 상용화막인 AMX보다 우수한 성능을 나타내었다.

• Fibers and Polymers
• /
• 제3권1호
• /
• pp.14-17
• /
• 2002

Development of a novel fixed site carrier membrane (FCM), supported by PET fabric for metal ion separation is reported. The membranes were prepared by dipping PET fabric into the methylene chloride solution of Poly(5-vinyl-m-phe-nylene-m'-phenylene-32-crown-10) (P(VCE)), a polymeric metal ion carrier. It was found that the flux of mono-valent metal ion transported across the membrane is signif=cantly differed from each other and the flux decreases in the order $Cs^+$>$Rb^+$>$K^+$>$Na^+$>$Li^+$ irrespective to the anion except perchlorate anion. It was explained in terms of the stability of the complex, formed by crown ether unit of the P(VCE) and the various metal ions, meanwhile, the lower rate of transport in the presence of perchlorate anion was ascribed to its low hydrophilicity.

• Journal of Electrochemical Science and Technology
• /
• 제12권3호
• /
• pp.358-364
• /
• 2021

In this study, an anion exchange membrane water electrolysis (AEMWE) cell was operated for ~1000 h at a voltage bias of 1.95 V. Impedance spectra were regularly measured every ~ 100 h, and changes in the ohmic and non-ohmic resistance were traced as a function of time. While there was relatively little change in the I-V curves and the total cell resistance during the long-term test, we observed various electrochemical phenomena in the cell: 1) initial activation with a decrease in both ohmic and non-ohmic resistance; 2) momentary and non-permanent bubble resistance (non-ohmic resistance) depending on the voltage bias, and 3) membrane degradation with a slight increase in the ohmic resistance. Thus, the regular test protocol used in this study provided clear insights into the performance degradation (or improvement) mechanism of AEMWE cells.