Adsorption of FeCl3, CuCl2 and ZnCl2 on silsesquioxane 3-n-propylpyridiniumchloride polymer film adsorbed on Al2O3 coated silica gel

被引:58
作者
Fujiwara, ST [1 ]
Gushikem, Y [1 ]
Alfaya, RVS [1 ]
机构
[1] UNICAMP, Inst Quim, BR-13083970 Campinas, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
silsesquioxane 3-n-propylpyridiniumchloride polymer; silica-alumina; metal preconcentration; metal adsorption from ethanol;
D O I
10.1016/S0927-7757(00)00685-3
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Silesquioxane 3-n-propylpyridiniumchloride polymer (abbreviated as SiPyCl), was used to coat SiO2/Al2O3 substrate surface to form the chemically modified solid SiO2/Al2O3/SiPyCl having the specific surface area S-BET = 233 m(2) g(-1). The resulting polymer film was strongly adhered to the surface by means of =Al-O-Si bonding (where =Al stands for Al2O3 grafted on SiO2 surface) and presented an ion exchange capacity of 1.04 mmol g(-1). The metal halides, MCz [M = Fe(III), Cu(II) and Zn(II)], were adsorbed by the modified solid from ethanol solutions as neutral species by forming the surface anionic complexes described by the equation: mSiO(2)/Al2O3/SiPyCl + MClz reversible arrow (SiO2/Al2O3/SiPy (1))(m)[MClz+m](m-), where FeCl4-, ZnCl42- have tetrahedral and CuCl42- distorted tetrahedral symmetries. The equilibrium coefficients, K, determined for each complex species showed that SiO2/Al2O3/SiPyCl + has a high affinity for the metal ions. The following values expressed as log K were found: Cu = 3.0, Zn = 3.5 and Fe = 3.0. The material could efficiently preconcentrate these metal ions from an ethanol solutions and release them in aqueous solution. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:135 / 141
页数:7
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