Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/68169
Type: Artigo de periódico
Title: Grafting of organosilane derived from 3-glycidoxypropyltrimethoxysilane and thiourea onto magnesium phyllosilicate by sol-gel process and investigation of metal adsorption properties
Author: Dey, RK
Oliveira, AS
Patnaik, T
Singh, VK
Tiwary, D
Airold, C
Abstract: A layered inorganic-organic magnesium silicate (Mg-GTPS-TU) has been successfully synthesized by using sol-gel based precursor under mild temperature conditions and a new silylaing agent (GTPS-TU) derived from 3-glycidoxypropyltrimethoxysilane (GTPS) and thiourea (TU) as the silicon source The. hybrid material was characterized through elemental analysis, infrared spectroscopy, X-ray diffractometry, thermogravimetry, and carbon and silicon solid-state nuclear magnetic resonance spectroscopy. The result confirmed the attachment of organic functionality to the inorganic silicon network. The interlamellar distance for the hybrid material was found to be 18.8 angstrom. Metal adsorption characteristics follows Cr(III) >Mn(II)>Zn(II) with more affinity towards Cr(Ill) in dilute aqueous solution. Evaluation of thermodynamic parameters Delta H and Delta S for Cr(III) were found to be 25.44 J mol(-1) and 79.9 J mol(-1) K(-1), respectively, indicating adsorption process to be endothermic in nature. The negative value of Delta G indicated the feasibility and spontaneity of ongoing adsorption process at relatively higher temperature. The presence of multiple coordination sites in the attached organic functionality expresses the potentiality of the hybrid material containing new silylating agent for heavy cation removal from ecosystem. (C) 2009 Elsevier Inc. All rights reserved.
Subject: Hybrid material
Silicon
Adsorption
Country: EUA
Editor: Academic Press Inc Elsevier Science
Rights: fechado
Identifier DOI: 10.1016/j.jssc.2009.05.011
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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