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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Adsorption of heavy metal ions and epoxidation catalysis using a new polyhedral oligomeric silsesquioxane

Texto completo
Autor(es):
Soares, Isaac V. [1] ; Vieira, Eduardo G. [1] ; Filho, Newton L. D. [1] ; Bastos, Andrea C. [1] ; da Silva, Nileia C. [1] ; Garcia, Edemir F. [1] ; Lima, Lucelia Julia A. [2]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Unesp Univ Estadual Paulista, Dept Quim Fis, BR-15385000 Sao Paulo - Brazil
[2] UFMS Univ Fed Mato Grosso Sul, Dept Ciencias Exatas, BR-79620080 Tres Lagoas, Mato Grosso Do - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: CHEMICAL ENGINEERING JOURNAL; v. 218, p. 405-414, FEB 15 2013.
Citações Web of Science: 14
Resumo

The objective of this research was the preparation of a silsesquioxane functionalized with eight chloropropyl chains (T-8-PrCl) and of a new derivative functionalized with a pendant linear chain (2-amino-1,3,4-thiadiazole - ATD; T-8-Pr-ATD). The two nanostructured materials were characterized by C-13 and Si-29 NMR, FTIR and elemental analysis. The new nanostructured material, octakis{[}3-(2-amino-1,3,4-thiadiazole)propyl] octasilsesquioxane (T-8-Pr-ATD), was tested as a ligand for transition-metal ions with a special attention to adsorption isotherms. The adsorption was performed using a batchwise process and the organofunctionalized surface showed the ability to adsorb the metal ions Cu (II), Co (II), and Ni (II) from water and ethanol. The adsorption isotherms were fitted by Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) model. The kinetics of adsorption of metals were performed using three models such as pseudo-first order, pseudo-second order and Elovich. The Langmuir and Elovich models were the most appropriate to describe the adsorption and kinetic data, respectively. Furthermore, the T-8-Pr-ATD was successfully applied to the analysis of environmental samples (river and sea water). Subsequently, a new nanomaterial was prepared by functionalization of the T-8-Pr-ATD with a Mo (II) organometallic complex (T-8-Pr-ATD-Mo). Only a few works in the literature have reported this type of substitution, and none dealt with ATD and Mo (II) complexes. The new Mo-silsesquioxane organometallic nanomaterial was tested as precursor in the epoxidation of cyclooctene and styrene. (C) 2012 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 11/18086-3 - Síntese e caracterização de híbridos inorgânico-orgânicos à base de silício: estudo de aplicação como adsorventes, catalisadores heterogêneos e modificadores de resinas epoxídicas
Beneficiário:Newton Luiz Dias Filho
Linha de fomento: Auxílio à Pesquisa - Regular