4.7 Article

Remarkable sensitivity for detection of bisphenol A on a gold electrode modified with nickel tetraamino phthalocyanine containing Ni-O-Ni bridges

Journal

JOURNAL OF HAZARDOUS MATERIALS
Volume 178, Issue 1-3, Pages 180-186

Publisher

ELSEVIER
DOI: 10.1016/j.jhazmat.2010.01.061

Keywords

Bisphenol A; Nickel phthalocyanine; Electropolymerization; Gold; Electrocatalysis; Cyclic voltammetry

Funding

  1. Department of Science and Technology (DST) through DST/NRF South African Research Chairs Initiative
  2. National Research Foundation (NRF), South Africa through DST/NRF South African Research Chairs Initiative

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This work reports the electrocatalysis of bisphenol A on Ni(II) tetraamino metallophthalocyanine (NiTAPc) polymer modified gold electrode containing Ni-O-Ni bridges (represented as Ni(OH)TAPc). The Ni(II)TAPc films were electro-transformed in 0.1 mol L-1 NaOH aqueous solution to form 'O-Ni-O oxo bridges', forming poly-n-Ni(OH)TAPc (where n is the number of polymerising scans). poly-30-Ni(OH)TAPc, poly-50-Ni(OH)TAPc, poly-70-Ni(OH)TAPc and poly-90-Ni(OH)TAPc films were investigated. The polymeric films were characterised by electrochemical impedance spectroscopy and the charge transfer resistance (R-CT) values increased with film thickness. The best catalytic activity for the detection of bisphenol A was on poly-70-Ni(OH)TAPc. Electrode resistance to passivation improved with polymer thickness. The electrocatalytic behaviour of bisphenol A was compared to that of p-nitrophenol in terms of electrode passivation and regeneration. The latter was found to passivate the electrode less than the former. The poly-70-Ni(OH)TAPc modified electrode could reliably detect bisphenol A in a concentration range of 7 x 10(-4) to 3 x 10(-2) mol L-1 with a limit of detection of 3.68 x 10(-9) mol L-1. The sensitivity was 3.26 x 10(-4) A mol(-1) Lcm(-2). (C) 2010 Elsevier B.V. All rights reserved.

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