Characterization of graphite-polyurethane composite electrodes modified with organofunctionalized SBA-15 nanostructured silica in the presence of heavy metal ions. Application to anodic stripping voltammetry

Autor(es)

Cesarino, Ivana ^[1] ; Cavalheiro, Eder T. G. ^[1] ; Brett, Christopher M. A. ^[2]

Afiliação do(s) autor(es)

^[1] Inst Quim Sao Carlos, Dept Quim & Fis Mol, BR-13566590 Sao Paulo - Brazil

^[2] Univ Coimbra, Fac Ciencias & Tecnol, Dept Quim, P-3004535 Coimbra - Portugal

• Tipo de documento: Artigo Científico
• Fonte: Microchimica Acta; v. 171, n. 1-2, p. 1-9, OCT 2010.
• Citações Web of Science: 10

Resumo

A graphite-polyurethane composite electrode with Santa Barbara Amorphous 15, SBA-15, mesoporous silica organofunctionalized with 2-benzothiazolethiol (BTSBA) as bulk modifier has been characterized electrochemically by voltammetry and electrochemical impedance spectroscopy (EIS) in the presence of cadmium ions, as an example of a toxic trace heavy metal, as well as by solid-state (13)C-NMR and by scanning electron microscopy. EIS measurements performed on the modified composite electrodes to investigate the influence of BTSBA on the deposition of cadmium during square wave anodic stripping voltammetry showed that organofunctionalization of the SBA-15 bulk modifier in the composite electrode facilitates heavy metal deposition. Experiments were also carried out with a mixture of submicromolar cadmium, lead, copper and mercury ions and led to similar conclusions. (AU)

• Processo FAPESP: 08/03537-7 - Desenvolvimento e aplicação de eletrodos compósitos à base de grafite-poliuretana e grafite-borracha de silicone-III: modificação com nanotubos de carbono e polímeros molecularmente impressos
• Beneficiário: Éder Tadeu Gomes Cavalheiro
• Modalidade de apoio: Auxílio à Pesquisa - Regular