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Type: Artigo de periódico
Title: Cation removal using cellulose chemically modified by a Schiff base procedure applying green principles
Author: da Silva, EC
de Melo, JCP
da Fonseca, MG
Airoldi, C
Abstract: Pentane-2,4-dione (acetylacetone) molecules were covalently incorporated under several different conditions to etilylene-1,2-diamine (en)-modified cellulose, using polar solvents or without solvents. The quantitative amount of en incorporated was given from 0.37 +/- 0.01 to 3.03 +/- 0.01 mmol of nitrogen per grain of cellulose, depending on the synthetic routes and after Schiff base formation this percentage was reduced by 1.38-6.12%. The synthetic routes indicated that lower solvent volumes produced higher amounts of en incorporation. However, the highest degree of pendant groups on the polymeric cellulose structure was obtained from a solvent-free reaction route. This procedure was applied for synthesizing all Schiff bases, causing a decrease in the amount of nitrogen. The available basic centers on the best covalently bonded biopolymer were investigated for adsorption of divalent copper, cobalt, nickel, and zinc from aqueous solution, with a capacity order Of Cu(2+) > Co(2+) > Ni(2+) > Zn(2+). Published by Elsevier Inc.
Subject: Modified cellulose
Schiff base
Free solvent
Cation adsorption
Country: EUA
Editor: Academic Press Inc Elsevier Science
Citation: Journal Of Colloid And Interface Science. Academic Press Inc Elsevier Science, v. 340, n. 1, n. 8, n. 15, 2009.
Rights: fechado
Identifier DOI: 10.1016/j.jcis.2009.08.012
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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