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Abatement of heavy metals and softening of hard water by the CoAlPO 4 ‐5/polysulfone membrane
Author(s) -
Lin ShiowShyung,
Chen ShihHsiung,
Chang ChiaYan,
Chang DongJang,
Chen ChiaChrn
Publication year - 2001
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1392
Subject(s) - membrane , polysulfone , metal , ion , chemistry , softening , radius , metal ions in aqueous solution , penetration (warfare) , analytical chemistry (journal) , atomic radius , durability , polymer chemistry , materials science , chemical engineering , chromatography , composite material , organic chemistry , mathematics , biochemistry , computer security , operations research , computer science , engineering
To improve the membrane, if CoAlPO 4 ‐5 was appropriately added, it could increase the rejection rate of metal ions compared with the PSf membrane. Besides, penetration rate would also increase, and the pressure applied could be lowered when the improved membrane was used. The optimum amount of CoAlPO 4 ‐5 added for Co : Al : P = 0.1 : 0.92 : 1.0 is about 5 wt %, while for the Co : Al : P = 0.08 : 0.93 : 1.0, this optimum value would shift toward a higher wt % because the latter has less active sites per unit weight of CoAlPO 4 ‐5. The hydrated radius of metal ion had great influence on the rejection rate. The larger the radius, for example, that of the +3 valence cations, the higher the rejection rate would exhibit, and the rate for Cd 2+ was much lower because its radius was the smallest one. Moreover, although incompatibility existed in the improved membrane and the variation of applied pressure was limited, durability of this membrane under the operating conditions was good. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 2768–2773, 2001