Abatement of heavy metals and softening of hard water by the CoAlPO4-5/plysulfone membrane

Citation
Ss. Lin et al., Abatement of heavy metals and softening of hard water by the CoAlPO4-5/plysulfone membrane, J APPL POLY, 80(14), 2001, pp. 2768-2773
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science","Material Science & Engineering
Journal title
JOURNAL OF APPLIED POLYMER SCIENCE
ISSN journal
0021-8995 → ACNP
Volume
80
Issue
14
Year of publication
2001
Pages
2768 - 2773
Database
ISI
SICI code
0021-8995(20010628)80:14<2768:AOHMAS>2.0.ZU;2-G
Abstract
To improve the membrane, if CoAlPO4-5 was appropriately added, it could inc rease the rejection rate of metal ions compared with the PSf membrane. Besi des, penetration rate would also increase, and the pressure applied could b e 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 h igher wt % because the latter has less active sites per unit weight of CoAl PO4-5. The hydrated radius of metal ion had great influence on the rejectio n rate. The larger the radius, for example, that of the +3 valence cations, the higher the rejection rate would exhibit, and the rate for Cd2+ was muc h lower because its radius was the smallest one. Moreover, although incompa tibility existed in the improved membrane and the variation of applied pres sure was limited, durability of this membrane under the operating condition s was good. (C) 2001 John Wiley & Sons, Inc.