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以含有苯酚的PBS溶液为电解液,采用循环伏安法研究了苯酚在碳纳米管修饰的玻碳电极表面电化学氧化的机理。结果表明,苯酚在碳纳米管修饰的电极表面的氧化机理为:苯酚先于正向扫描中不可逆氧化为苯醌后,在负向扫描中被还原为对苯二酚和邻苯二酚,对苯二酚和邻苯二酚可进一步发生可逆氧化还原反应而存在于溶液中。对苯二酚和邻苯二酚的生成对苯酚氧化形成苯醌的峰电流产生干扰,从而影响苯酚电化学测定的灵敏度和准确性。
The mechanism of electrochemical oxidation of phenol on the surface of carbon nanotubes modified glassy carbon electrode was studied by cyclic voltammetry using phenol solution in PBS as electrolyte. The results showed that the oxidation mechanism of phenol on the surface of carbon nanotube modified electrode was that phenol was reduced to hydroquinone and catechol in negative scan after the irreversible oxidation to benzoquinone in positive scan, The hydroquinone and catechol may be further subjected to a reversible oxidation-reduction reaction in the solution. The formation of hydroquinone and catechol interfered with the peak current of phenol to form benzoquinone, which affected the sensitivity and accuracy of phenol electrochemical determination.