서지주요정보
요오드이온 매체 아황산가스용액의 양극산화반응에 관한 연구 = A study on the anodic oxidation of iodide-mediated sulfur dioxide solution
서명 / 저자 요오드이온 매체 아황산가스용액의 양극산화반응에 관한 연구 = A study on the anodic oxidation of iodide-mediated sulfur dioxide solution / 조병원.
저자명 조병원 ; Cho, Byung-Won
발행사항 [서울 : 한국과학기술원, 1987].
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소장정보

등록번호

4104695

소장위치/청구기호

학술문화관(문화관) 보존서고

DCE 8714

SMS전송

도서상태

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반납예정일

초록정보

Potentiodynamic, RRDE, chronopotentiometric and chronoamperometric methods were used to investigate the mechanism of the anodic oxidation of iodide-mediated sulfur dioxide solution. The properties of catalytic current in chronoamperometry are derived and the rate constant of the reaction between iodine and sulfur dioxide in sulfuric acid is determined from the experimental catalytic current. The catalytic depolarization effects of potassium iodide are between 0.25V and 0.5V, depending on electrode materials and current densities. The anodic oxidation behaviors are different at the platinum and graphite electrodes and are affected by the ensuing chemical reactions. At low electrode potential iodide ions are initially oxidized to iodine and this is followed by the chemical reaction of iodine with sulfur dioxide. At high electrode potential the anodic oxidation of iodide progresses to iodate and this is followed by the chemical reaction of iodate with sulfur dioxide. The iodide ions regenerated from the chemical reaction near the electrode surface are available again for oxidation without a supply of iodide ion from the bulk solution. The anodic current increases with the increase of potassium iodide concentration, sulfur dioxide concentration, and rotation speed of electrode. The intermediate product, i.e. iodine, was detected by the RRDE measurement. The ring current generated by the electrochemical reduction of iodine increases with the increase of potassium iodide concentration and rotation speed of electrode. The transition time in chronopotentiometry for the anodic oxidation of iodide-mediated sulfur dioxide solution is much longer than that for the electrochemical oxidation of iodide solution by the regeneration of iodide near the electrode surface. The RDE, RRDE and chronopotentiometric results demonstrate almost no electrochemical oxidation of sulfur dioxide. The reaction rate constant of iodine and sulfur dioxide at 22℃ in 0.5M sulfuric acid is $1.2×10^4(1.mol^{-1}.sec^{-1})$. the reaction layer thickness in which the chemical reaction between electrogenerated iodine and sulfur dioxide occurs and the diffusion layer thickness for the case of pure diffusion are discussed. The reaction layer thickness decreases with the increase of sulfur dioxide concentration and is in the range of $6.3×10^{-5}$ to $4.0×10^{-4}cm$ for 5.0-200mM $SO_2$ at the steady state. The depolarization effects of iodide-mediated sulfur dioxide solution in comparison with the conventional water electrolysis are 1.4V for the graphite electrode and 1.65V for the platinum electrode.

서지기타정보

서지기타정보
청구기호 {DCE 8714
형태사항 xii, 149 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : 1, 식[4-2-13] 및 식 [4-2-14] 의 유도. - 2,수집효율의 계산. - 3, 식[6-5-5]의 유도
저자명의 영문표기 : Byung-Won Cho
지도교수의 한글표기 : 정인재
공동교수의 한글표기 : 윤경석
지도교수의 영문표기 : In-Jae Chung
공동교수의 영문표기 : Kyung-Suk Yun
학위논문 학위논문(박사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 132-141
주제 Electrodes.
Electrolytic reduction.
Electrolytic oxidation.
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