河南科学
河南科學
하남과학
HENAN SCIENCE
2014年
1期
20-23
,共4页
石墨烯%邻苯二酚%对苯二酚%循环伏安法%同时测定
石墨烯%鄰苯二酚%對苯二酚%循環伏安法%同時測定
석묵희%린분이분%대분이분%순배복안법%동시측정
graphene%catechol%hydroquinone%cyclic voltammetry%simultaneous determination
通过恒电位法将氧化石墨烯还原为石墨烯，制备了石墨烯-Nafion修饰玻碳电极.用循环伏安法研究了邻苯二酚和对苯二酚两种异构体在该电极上的电化学行为.结果表明，该修饰电极对苯二酚的这两种异构体的氧化表现出了优异的识别能力和电催化性能.对苯二酚和邻苯二酚的氧化峰电位差值为102 mV，这表明两种异构体可以在石墨烯-Nafion修饰电极上完全分开.基于对苯二酚和邻苯二酚在石墨烯-Nafion修饰电极上的伏安行为，建立了苯二酚两种异构体同时测定的方法.在最佳实验条件下，邻苯二酚的浓度在6．0×10-5～1．0×10-3 mol/L范围内与氧化峰电流呈线性关系，检出限为1．0×10-5 mol/L .对苯二酚的浓度在8．0×10-6～1．0×10-3 mol/L范围内与氧化峰电流呈线性关系，检出限为2．0×10-6 mol/L .该电极可用于模拟样品中两种异构体的同时测定，结果令人滿意.
通過恆電位法將氧化石墨烯還原為石墨烯，製備瞭石墨烯-Nafion脩飾玻碳電極.用循環伏安法研究瞭鄰苯二酚和對苯二酚兩種異構體在該電極上的電化學行為.結果錶明，該脩飾電極對苯二酚的這兩種異構體的氧化錶現齣瞭優異的識彆能力和電催化性能.對苯二酚和鄰苯二酚的氧化峰電位差值為102 mV，這錶明兩種異構體可以在石墨烯-Nafion脩飾電極上完全分開.基于對苯二酚和鄰苯二酚在石墨烯-Nafion脩飾電極上的伏安行為，建立瞭苯二酚兩種異構體同時測定的方法.在最佳實驗條件下，鄰苯二酚的濃度在6．0×10-5～1．0×10-3 mol/L範圍內與氧化峰電流呈線性關繫，檢齣限為1．0×10-5 mol/L .對苯二酚的濃度在8．0×10-6～1．0×10-3 mol/L範圍內與氧化峰電流呈線性關繫，檢齣限為2．0×10-6 mol/L .該電極可用于模擬樣品中兩種異構體的同時測定，結果令人滿意.
통과항전위법장양화석묵희환원위석묵희，제비료석묵희-Nafion수식파탄전겁.용순배복안법연구료린분이분화대분이분량충이구체재해전겁상적전화학행위.결과표명，해수식전겁대분이분적저량충이구체적양화표현출료우이적식별능력화전최화성능.대분이분화린분이분적양화봉전위차치위102 mV，저표명량충이구체가이재석묵희-Nafion수식전겁상완전분개.기우대분이분화린분이분재석묵희-Nafion수식전겁상적복안행위，건립료분이분량충이구체동시측정적방법.재최가실험조건하，린분이분적농도재6．0×10-5～1．0×10-3 mol/L범위내여양화봉전류정선성관계，검출한위1．0×10-5 mol/L .대분이분적농도재8．0×10-6～1．0×10-3 mol/L범위내여양화봉전류정선성관계，검출한위2．0×10-6 mol/L .해전겁가용우모의양품중량충이구체적동시측정，결과령인만의.
A graphene-Nafion modified glassy carbon electrode (graphene-Nafion/GCE) was prepared by potentiostatic reduced graphene oxide on electrode surface. The electrochemical behavior of catechol and hydroquinone at the graphene-Nafion/GCE was investigated by cyclic voltammetry. The experimental results showed that the graphene-Nafion/GCE exhibited strong recognition and electrocatalytical ability toward two dihydroxyhenzene isomers. The oxidation peak potential difference between hydroquinone and catechol was 102 mV,which indicated that the two isomers could be identified entirely at the graphene-Nafion/GCE. Based on their voltammetric behavior, a method was proposed for the simultaneous determination of two dihydroxybenzenes at the graphene-Nafion/GC electrode. Under the optimum conditions,the oxidation peak current was linearly proportional to the concentration of catechol in the range of 6.0 ×10-5~1.0 ×10-3 mol/L,and its detection limit was 1.0 ×10-5 mol/L. The calibration curves showed good linear relationship for hydroquinone in the range of 8.0 ×10 -6~1.0 ×10 -3 mol/L,and its detection limit was 2.0×10-6 mol/L. The proposed method was successfully applied in simultaneous determination of two dihydroxyhenzene isomers in simulated samples.
