• Journal of Electrochemical Science and Technology
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• 제15권2호
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• pp.268-275
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• 2024

The study examined the electrogeneration of hypochlorite ions (ClO^-) via electrolysis of aqueous NaCl solutions using a dimensionally stable anode-type (DSA-type) electrode based on platinum and palladium oxides supported on titanium mesh (Ti/PtPd(10%)O_x). The electrogenerated ClO^- was quantified on the basis of the absorption band at 292 nm (A_λ = 292) of the UV-Vis spectrum. The effect of initial pH, concentration of NaCl, cell potential difference and electrolysis time were investigated in this study. The results showed that the electrolysis of aqueous NaCl solutions increases the solution pH up to high values (≥ 8.0) that favor the formation of ClO^- over chlorine or hypochlorous acid. The hypochlorite concentration increases significantly at pH values > 7.0 and shows a linear trend with increasing NaCl concentration and with increasing cell potential difference. When the cell potential and NaCl concentration are held constant, the maximum hypochlorite value during electrolysis depends on both the cell potential and NaCl concentration. The Ti/PtPd(10%)O_x anode favors the production of hypochlorite ions, making this anode a promising material for use in electrochemical oxidation of wastewater via an indirect mechanism.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.1361-1362
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• 2007

There is great interest in the applicability of electrogenerated hydrogen peroxide to a wide variety of industrial processes, usually involving oxidation of organics. Hydrogen peroxide is now employed for the bleaching of mechanical pulp and the bleaching of chemical pulp in the pulp and paper industry, thus displacing the traditional alkaline treatments with chlorine-based chemicals. This psper reperts a comparative study of $H_{2}O_{2}$ electogeneration on gas-diffusion electrode in divided cell with several $Nafion^{(R)}$ protonexchange membranes, Russian cation-exchange membrane MK-40 and SPEEK membrane. The influence of different PEMs on electrochemical cell voltage, current efficiency and energy consumption of hydrogen peroxide electrogeneration has been stadied.

• 한국자원리싸이클링학회:학술대회논문집
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• 한국자원리싸이클링학회 2005년도 춘계임시총회 및 제25회 학술발표대회
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• pp.23-27
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• 2005

본 연구에서는 유가금속 성분이 약 45%인 폐인쇄회로기판을 사용하여 염산 용액에서 전해생성된 염소에 의한 침출 거동을 조사하였다. 폐인쇄회로기판내 유가금속 중 구리는 약 84%에 해당하였다. 전해생성된 염소에 의한 침출거동에 미치는 변수들의 영향을 조사한 결과 염소의 전핸생성 및 교반에 의한 용액으로의 용해 및 혼입 단계가 침출율에 가장 큰 영향을 주었다. 염산농도 1M, 전류밀도 $20\;mA/cm^2$, 교반속도 600 rpm, 용액온도 $50^{\circ}C$의 조건에서 99%의 침출율을 얻었다. 전해생성된 염소의 침출반응 이용율은 교반속도가 높고 전류밀도가 낮을수록 높아졌다. 반응 초기에는 알루미늄, 납, 주석 등 시료내 기타 금속성분들의 침출이 주로 일어났으며, 이러한 반응이 둔화됨에 따라 구리의 침출이 증가하였다.