Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa.
J Hazard Mater. 2010 Jun 15;178(1-3):180-6. doi: 10.1016/j.jhazmat.2010.01.061. Epub 2010 Jan 20.
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 7x10(-4) to 3x10(-2)mol L(-1) with a limit of detection of 3.68x10(-9)mol L(-1). The sensitivity was 3.26x10(-4)A mol(-1) L cm(-2).
这项工作报道了双酚 A 在含有 Ni-O-Ni 桥的 Ni(II)四氨基酞菁镍（NiTAPc）聚合物修饰金电极上的电催化作用（表示为 Ni(OH)TAPc）。在 0.1 mol L(-1) NaOH 水溶液中，Ni(II)TAPc 薄膜通过电转化形成“O-Ni-O 氧桥”，形成聚-n-Ni(OH)TAPc（其中 n 是聚合扫描的数量）。研究了聚-30-Ni(OH)TAPc、聚-50-Ni(OH)TAPc、聚-70-Ni(OH)TAPc 和聚-90-Ni(OH)TAPc 薄膜。通过电化学阻抗谱和电荷转移电阻（R(CT)）值对聚合薄膜进行了表征，随着薄膜厚度的增加，R(CT)值增大。聚-70-Ni(OH)TAPc 对双酚 A 的检测具有最佳的催化活性。随着聚合物厚度的增加，电极对钝化的抵抗力提高。从电极钝化和再生的角度比较了双酚 A 和对硝基苯酚的电催化行为。发现后者比前者更容易使电极钝化。聚-70-Ni(OH)TAPc 修饰电极可以在 7x10(-4) 至 3x10(-2)mol L(-1)的浓度范围内可靠地检测双酚 A，检测限为 3.68x10(-9)mol L(-1)。灵敏度为 3.26x10(-4)A mol(-1) L cm(-2)。
