Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/93146
Type: Artigo de periódico
Title: Calorimetric Investigation Of Metal Ion Adsorption On 3- Glycidoxypropyltrimethylsiloxane + Propane-1,3-diamine Immobilized On Silica Gel
Author: Sales J.A.A.
Airoldi C.
Abstract: The silylant precursor agent 3-glycidoxypropyltrimethoxysilane was covalently anchored onto a silica gel surface followed by propane-1,3-diamine molecule incorporation using a heterogeneous route (SiHT). On another series, the precursor agent was previously reacted with diamine to give the silylant agent in homogeneous condition, before immobilization (SiHM). The degrees of immobilization were 0.80 and 1.53 mmol g-1 for SiHT and SiHM, respectively. Both grafting surfaces were employed to extract the divalent cations nickel, copper, cobalt and zinc from aqueous solutions. This cation/nitrogen interactive process was calorimetrically followed to give exothermic enthalpy, negative free Gibbs energy and positive entropy values. These favorable thermodynamic data are more pronounced for copper on both surfaces, with a higher tendency for SiHM, due to the larger amount of available nitrogen atoms in the pendant chain covalently attached to the inorganic silica backbone. © 2004 Elsevier B.V. All rights reserved.
Editor: 
Rights: fechado
Identifier DOI: 10.1016/j.tca.2004.08.015
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-15944394048&partnerID=40&md5=bb5484c07badda698079634d50d9327d
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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