Electropolymerization of brilliant cresyl blue on carbon ionic liquid electrode and electrocatalytic application for the voltammetric determination of ascorbic acid

Abstract

Azul de cresil brilhante (BCB) foi eletropolimerizado sobre a superfície de um eletrodo de carbono líquido iônico (CILE) por voltametria cíclica de varredura na faixa de potencial de-0,5 a 1,0 V. CILE foi preparado usando o 1-etil-3-metil-imidazólio tetrafluoroborato ([EMIM]BF 4) como modificador. Um filme polimerico estável de BCB foi obtido no CILE com aparecimento de um par de picos redox. As características do filme PBCB foram estudadas por diversos métodos tais como, microscopia eletrônica de varredura (SEM), espectroscopia de impedância eletroquímica (EIS) e voltametria cíclica. O eletrodo modificado apresentou excelente resposta eletrocatalítica para ácido ascórbico com o aumento das respostas eletroquímicas. Sob condições ótimas, uma boa resposta voltamétrica linear foi obtida no intervalo 2,0 × 10-5-3,0 × 10-3 mol L-1 , com limite de detecção de 6,5 μmol L-1 (3s). Brilliant cresyl blue (BCB) was electropolymerized on the surface of a carbon ionic liquid electrode (CILE) by cyclic voltammetric sweep in the potential range from-0.5 to 1.0 V. CILE was prepared by using 1-ethyl-3-methyl-imidazolium tetrafluoroborate ([EMIM]BF 4) as modifier. The stable polymer film of BCB was obtained on the CILE and a pair of redox peaks appeared. The characteristics of PBCB film was studied by different methods such as scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry. This modified electrode showed excellent electrocatalytic response to ascorbic acid with the increase of the electrochemical responses. Under the optimal conditions a good linear voltammetric response could be obtained over the range of 2.0×10-5-3.0×10-3 mol L-1 and the detection limit was got as 6.5 μmol L-1 (3s).

Poly(brilliant Cresyl Blue)-Modified Electrode for Highly Sensitive and Simultaneous Determination of Hydroquinone and Catechol

“…Recently, PBCB-modified various electrodes such as GCE, [22][23][24] CNT-GCE, [39][40][41][42] GNP-GCE, 43 and carbon ionic liquid electrode (CILE) 44 have been reported for sensing application. Yang et al 22 developed a nitrite sensor based on the PBCB-modified GCE.…”