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Authors: Chanda M, Rempel GL
Article Title: Enhanced copper selectivity and faster sorption kinetics of poly(4-vinylpyridine) crosslinked in presence of copper(II) as template on silica gel.
Publication date: 1992
Journal: Reactive Polymers
Volume: 16
Issue: (2)
Page numbers: 149-158.
DOI: 10.1016/0923-1137(92)90022-T
Abstract: Poly(4-vinylpyridine) supported on silica gel using Cu(II) as template ion has been crosslinked by quaternization with 1,4- dibromobutane to obtain a selective sorbent, SiO2..[PVP.TQ(Cu)], which shows significantly greater selectivity than unquaternized and unsupported resin, PVP, for copper sorption in the presence of nickel. SiO2..[PVP.TQ(Cu)] has a 5-fold greater saturation capacity (per unit mass of resin) and a 220-fold larger binding constant for Cu(II) sorption, as compared to PVP. There is also an order of magnitude increase in the rate of sorption, the t1/2 values for the sorption being 8 and 102 min with effective diffusivities of Cu(II) 1.7 x 10(-6) and 2.7 x 10(-7) cm2/s in SiO2..[PVP.TQ(Cu)] and PVP, respectively. While the loaded Cu(II) is stripped easily by HCl on both SiO2..[PVP.TQ(Cu)] and PVP, the former has an order of magnitude higher rate of stripping than the latter for the same strength of the stripping agent
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