以黏粒修飾電極法探討對苯二酚的電化學反應

Electrochemical Study of Hydroquinone Using Clay-modified Electrodes

曾綉丹(Hsiu-Dan Zen)；陳鴻基(Horng-Ji Chen)；曾志明(Jyh-Myng Zen)

黏土礦物 ； 對苯二酚 ； 電化學分析 ； Clay minerals ； Hydroquinone ； Electroanalysis

台灣農學會報

13卷1期（2012 / 02 / 01）

1 - 30

繁體中文

對苯二酚是一種常被用於還原劑、抗氧化劑與藥物中的成分，其也是土壤中最普遍的酚酸物種與土壤腐植物質先驅物中很重要的成分。以六種黏土礦物修飾電極對有、無巴拉刈存在之對苯二酚進行循環伏安圖的偵測。試驗結果指出巴拉刈的存在明顯會影響對苯二酚在黏粒修飾電極表面的電化學行為，其中以在多鐵蒙特石修飾電極對對苯二酚所偵測之循環伏安圖與波峯電流量的影響最大。由於多鐵蒙特石八面體層中的鐵較具有電子傳導與催化上的功能，使巴拉刈在此電極表面能促進對苯二酚的催化聚合，使其測得之氧化還原波峯電流量非常少。然而，坡縷石邊緣的-OH官能基在鄰苯二酚與電極間電子傳導上扮演一重要的角色，使得巴拉刈的存在明顯促進坡縷石修飾電極對對苯二酚所測得之氧化波峯電流量增加。結果也明顯指出對苯二酚在不同結晶構造與電荷特性之黏土礦物修飾電極上的電化學反應受巴拉刈影響差異很大。

Hydroquinone is widely used as a reducing agent, antioxidant, and drug. It is also a widespread phenol compound in soils and a precursor of soil humus. We studied the electrochemical behavior of hydroquinone at six different clay-modified electrodes in the absence and presence of paraquat. The results indicated the electrochemical behavior of hydroquinone was affected by different crystal structures and layer charges of clay minerals in the presence of paraquat, with the clearest effect at ferruginous smectite. The electrocatalytic polymerization of hydroquinone caused a much smaller peak current. Interestingly, the hydroxyl group of palygorskite could enhance the peak current of hydroquinone under the reaction of paraquat. Overall, we observed different cyclic voltammograms and peak currents of hydroquinone under the redox mediation of paraquat at different crystal structures and layer charges of clay minerals.