Desenvolvimento e aplicação de plataformas fundamentadas na tecnologia dos polímeros impressos molecularmente para detecção de 4-nitrofeno

• Ano de defesa: 2017
• Autor(a) principal: Cordeiro, Walker de Lima
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Alagoas; Brasil; Programa de Pós-Graduação em Química e Biotecnologia; UFAL
• Palavras-chave em Português: Química analítica; Sensores químicos; Polímero de impressão molecular; 4- Nitrofenol; Chemical sensors; 4-Nitrophenol; Molecularly imprinted polymer; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ANALITICA
• Link de acesso: http://www.repositorio.ufal.br/handle/riufal/1940

The present work describes the development of a highly sensitive and selective molecularly imprinted electrochemical sensor for 4-nitrophenol detection. A glassy carbon electrode was modified with vyniltrimethoxisylane (VTMS) and multiwall carbon nanotubes (MWCNT). The introduced nanocomposite increased surface area and active sites for electron transfer. When the sillane is used on the synthesis, it is named MIS (molecularly imprinted silane) and NIS (non-imprinted silane) when the analyte is not on the synthesis. For those silane films characterization, it was used the scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and fourier transform infrared spectroscopy (FTIR). This sensor showed its best performance in 0.1 mol L-1 phosphate buffer solution, at pH 7.0. After optimizing the operational conditions, this sensor provided a linear response range for 4-NP from 0.1 up to 100 μmol L-1 and good parameters as LOD, LOQ and sensibility, 0.03 μmol L-1, 0.1 μmol L-1 and 1.4×10-2 A mol L-1 respectively. Furthermore, the MIS/PNP sensor exhibited good stability with adequate reproducibility and accuracy.