کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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641861 | 1457011 | 2013 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Functionalized chitosan based nano-filter membranes for pH-controlled separation of amino acids Functionalized chitosan based nano-filter membranes for pH-controlled separation of amino acids](/preview/png/641861.png)
pH-controlled separation of AAs was achieved by electro-membrane cell (EMC) with three compartments (central, comp. 1 and comp. 2). EMC is based on the principles of electrodialysis (ED) using indigenous cation-exchange and anion-exchange nanofilter (C-NF and A-NF, respectively). Water permeabilities (1.1–1.5 mh−1 bar−1) and molecular cut-off (MWCO) values (400–500 Da) for C-NF and A-NF, were suggested their nanofilter (NF) nature. Electrochemical properties of these membranes confirmed their suitability for EMC. Chronopotentiometric studies revealed the electro-transport of positively charged lysine (LYS+) and negatively charged glutamic acid (GLU−) across C-NF and A-NF, respectively, at pH: 6.1 under applied voltage. While glycine at its pI (pH: 6.1) remained immobile. Thus, separation of AAs (ternary mixture) by iso-electric point (pI) focusing of one component was proposed. Under optimized experimental conditions (i.e. at 4.0 V constant applied voltage, pH: 6.1 for 0.05 M equi-molar LYS–GLU–GLY mixture), about 4.0 kW h kg−1 of AA separated energy consumption, 82% current efficiency and 90% product recovery showed the economic and technical feasibility of EMC for industrial exploitation.
► Charge based pH-controlled separation of amino acids.
► Indigenously prepared highly selective cationic and anionic charged nano-filter membranes, used in electro-membrane cell.
► Chronopotentiometric studies revealed the electro-transport and selectivity in separation.
Journal: Separation and Purification Technology - Volume 108, 19 April 2013, Pages 57–64