CAJ | 학술논문

利用L-半胱氨酸自组装膜修饰金电极(L-Cys,Au/SAMs), 在0.05mol/L H_2SO_4 底液中研究了 Na_2SeO_3 的电化学特性.在0.00～1.30 V (vs. SCE) 电位范围内对微量Na_2SeO_3进行循环伏安扫描,发现L-Cys, Au/SAMs修饰电极在峰电位0.89 V处有灵敏的Se的氧化溶出峰.通过比较裸金电极和修饰电极在Na_2SeO_3 溶液中的电化学特性发现,修饰电极通过巯基中的S与Na_2SeO_3发生氧化还原作用生成Se,且修饰电极对沉积在电极表面的Se的氧化过程具有催化作用.根据Na_2SeO_3在单分子膜上的电化学行为,提出了单分子膜中硫(Au-S)与Se(Ⅳ)作用生成Se的反应机理、Se电化学催化氧化机理及巯基化合物通过生成纳米硒生物吸收Se的类生物膜模型.
이용L-반광안산자조장막수식금전겁(L-Cys,Au/SAMs), 재0.05mol/L H_2SO_4 저액중연구료 Na_2SeO_3 적전화학특성.재0.00～1.30 V (vs. SCE) 전위범위내대미량Na_2SeO_3진행순배복안소묘,발현L-Cys, Au/SAMs수식전겁재봉전위0.89 V처유령민적Se적양화용출봉.통과비교라금전겁화수식전겁재Na_2SeO_3 용액중적전화학특성발현,수식전겁통과구기중적S여Na_2SeO_3발생양화환원작용생성Se,차수식전겁대침적재전겁표면적Se적양화과정구유최화작용.근거Na_2SeO_3재단분자막상적전화학행위,제출료단분자막중류(Au-S)여Se(Ⅳ)작용생성Se적반응궤리、Se전화학최화양화궤리급구기화합물통과생성납미서생물흡수Se적류생물막모형.
The cyclic voltammetric behaviors of sodium selenite on the gold electrode modified by L-cysteine self-assembled monolayer (L-Syc,Au/SAMs) has been investigated in 0.05 mol/L H_2SO_4 solutions with sodium selenite. Sensitive anodic stripping current of selenium (Se) with the peak potential at 0.99 V (vs. SCE) has been observed. In comparison with the electrochemical properties of sodium selenite on the modified electrode with those on the naked gold electrode, it was found that selenite was reduced to selenium by the redox interaction with sulfur on the monolayer and the monolayer catalytically oxidizes Se as the electrode was positively scanned. According to the electrochemical properties of sodium selenite both on the naked and modified gold electrode, the Se deposition mechanism and catalytic mechanism as well as bionic membrane model were proposed for the bio-utilization of selenite through nano scale selenium.