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RISS 인기검색어
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- 저자 : 김학준(Hark Joon Kim) (검색결과 34 건)
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김학준,Kim Hark-Joon 한국전기화학회 1999 한국전기화학회지 Vol.2 No.1
복극성 전극반응기에서 복잡반응이 일어날 때 반응기 모델링하여 농도경시변화로 부터 전류값을 계산하였다. 이를 실험한 전류와 비교한 결과 잘 일치하였다. 본 논문에서 제안된 모델링이 파이로트 장치 설계에 유용하게 운용될 것이다. A mathematical analysis of bipolar electrode reactor model for complex electrochemical reactions could estimate total current from time-concentration data, which coincided well with experimental total current data. Thus behaviour of bipolar electrode reactor could be described by a proposed simulation model. This paper demonstrates how such a model can be used a useful tool in the design for pilot plant experimentation.
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펠레트 충전층 전극 반응기의 특성 - 흑연 펠레트 전극 -
김학준 ( Hark Joon Kim ) 한국공업화학회 1992 공업화학 Vol.3 No.4
흑연 펠레트 전극으로 채워진 복극성 고정상 충전층 전극 반응기에 대하여 등가회로 모델을 적용하여 반응기에 가해진 전류에 대한 복극성 전극에 흐른 Faradaic 전류의 비를 전해액의 전도도와 순환속도에 대하여 검토하였다. 전전류에 대한 Faradaic 전류의 비는 인가전류(전압)에 따라 증가하며, 전해액 전도도와 액 순환속도의 증가에 따라 감소하였다. For describing the bipolar packed-bed electrode cell filled with graphite pellete electrode, the application of the model of equivalent circuit was studied. The ratio between the Faradaic current through bipolar electrodes and the applied current was dependent on the resistance coefficient, specific conductivity of electrolyte, and electrolyte circulation rate. The ratio of the Faradaic current through bipolar electrodes to the applied current increased with the applied current(or cell voltage), but decreased with the increase of electrolytic conductivity and circulation rate of the electrolyte.
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남종우,김학준,Nam, Chong-Woo,Kim, Hark-Joon 대한화학회 1970 대한화학회지 Vol.14 No.3
Electrodeposition of lead peroxide on the graphite core was studied. The results are following; 1) At more noble potential than 1.6V vs. S.C.E. and lower temperature than $40^{\circ}C$, $PbO_2$ deposited current efficiency is increased but deposited layer falls off easily from graphite core. 2) Oxygen overvoltage of $PbO_2$ deposited layer on the graphite core is largely with increasing $PbO_2$ depositing anodic potential and with lowlying electrolytic temperature. 3) To obtain the $PbO_2$ deposited layer without falling off from the graphite core, it is necessary to change the electrolytic conditions, anodic potential and electrolytic temperature, in four stages successively.
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남종우,김학준,Nam, Chong-Woo,Kim, Hark-Joon 대한화학회 1973 대한화학회지 Vol.17 No.5
To investigate the mechanism of the reaction of electrolytic oxidation of iodide to iodate ions, polarization curves are determined in various kinds of solution using electrodeposited lead peroxide and platinum anodes. It was observed from the polarization curves that the limiting current is exists at concentration 1.5 M of potassium iodide, and these limiting current disappeared as potassium hydroxide was added up to concentration of 0.1 M. while in case of platinum anode, limiting current did not appear in dilute potassium iodide solution. These results are owing to the chemical reaction, $PbO_2+2I^{-}+2H^+{\to}PbO+I_2+H_{2}O$ ocurring at the surface of lead peroxide anode. Also, we studied to obtain the optimum conditions of electrolytic preparation of iodate from iodide solution using a cell without the diaphragm. The results are that; (a) addition of potassium dichromate at the anti-reducing agent is proper in concentration of 0.1 g/l, (b) electrolytic temperature is not so much effective in raising the current efficiency, (c) current efficiency is increased with current density, and (d) electrolysis is the most effective in weak alkaline solutions. 요오드화칼륨으로부터 요오드산칼륨까지의 양극산화시 그 반응의 내용을 검토키 위하여 전착과산화납 및 백금양극을 사용하여 각종 농도의 요오드화칼륨 수용액중에서 분극곡선을 측정한 결과 요오드화칼륨의 1.5M이하에서 한계전류가 존재하며 0.1M의 수산화칼륨을 가하였을때는 한계전류는 나타나지 않음을 알았다. 한편 백금양극의 경우에는 과산화납양극에서와 같이 희박한 요오드화 칼륨수용액중에서 한계전류가 나타나지 않으며 이는 과산화납양극표면에서 $PbO_2+2I^{-}+2H^+{\to}PbO+I_2+H_{2}O$와 같은 화학반응에 기인함을 알았다. 무격막전해조를 사용하여 요오드화염으로부터 요오드산염까지의 전해제조시 가장 효율적인 전해조건에 관하여서도 검토한 결과, (a)환원방지제인 중크롬산칼륨의 첨가는 0.1g/l의 농도가 적당하였으며, (b)전해온도는 전류효율에 큰 영향을 미치지 않았으며, (c)전류밀도가 증가함에 따라 전류효율은 상승하였고, (d)전해중 전해액의 액성은 약알카리성이 가장 효율적이었다.
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남종우,김학준,Nam Chong Woo,Kim Hark Joon 대한화학회 1974 대한화학회지 Vol.18 No.5
저자들에 의해서 이미 보고되어 있는 요오드화염으로부터 요오드산염$(I^-{\to}{IO_3}^-)$ 및 요오드산염으로 부터 과요오드산염$({IO_3}^-{\to}{IO_4}^-)$까지의 전해결과를 참작하여 무격막 전해조와 이산화납양극을 사용하여 요오드화염으로부터 과요오드산염$(I^-{\to}{IO_4}^-)$을 직접 전해제조하기 위한 최적 전해조건에 관하여 검토하였다. 0.5g/l의 환원방지제인 중크롬산칼륨을 함유함 1몰의 요오드화칼륨 수용액을 15A/$dm^2$의 양극전류밀도와 $60^{\circ}C$</TECX>의 전해온도에서 전해한 결과, 요오드화칼륨으로 부터 과요오드산칼륨까지의 변화율 98%에서 전류효율이 84%이었다. 또한 각종 전해액중에서 이산화납 양극에 의한 분극곡선으로 부터 전극반응의 내용도 설명하였다. Direct electrochemical preparation of periodate from iodide $(I^-{\to}{IO_4}^-)$ was investigated using a none-diaphragm cell and lead dioxide anode. The direct electrolytic conditions were combinations of the respectively results on the processes of iodate from iodide$(I^-{\to}{IO_3}^-)$, and periodate from iodate$({IO_3}^-{\to}{IO_4}^-)$ which were reported by the author, previously. The optimum condition was achieved when 1.0 M potassium iodide solution containing 0.5 g/l potassium dichromate as an anti-reducing agent was electrolyzed at anodic current density of $15{\AA}/dm^2$ and electrolytic temperature of $60^{\circ}C$</TECX>. Under such a condition, the current efficiency was found to be 84 % at 98 % conversion of iodide to periodate. The explanation of electrode reaction was also given a consideration based on the polarization curves at lead dioxide anode in various electrolyte solutions.
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윤조희(Cho Hee Yoon),김학준(Hark Joon Kim) 한국물환경학회 2001 한국물환경학회지 Vol.17 No.4
Electrochemical decolorization from secondary effluent of livestock wastewater treated with biological process was carried out and investigated in this study. The bipolar packed-bed metal electrode reactor as the electrochemical process has been employed for the test. Operating variables of this process including different packing electrode materials, current density, flow rate to the reactor, temperature and additive were considered to determine their respective effect of color removal. From the test results, PbO₂ electrode as anode electrode was found to be suitable for this process among various materials and optimal current density was 1.48 A/dm². The total theoretical voltage obtained from voltage-current curve was 45 V in reactor and 4.5 V per unit layer bipolar cell. And the effect of an aqueous solution(17 mM, pH 9) with the added NaCl on color removal from secondary effluent was observed to be actually more effective than without the added NaCl. Color removal increased with an increase in temperature over 50 ℃. However, increasing the flow rate decrease color removal efficiency and the value of maximum efficiency 96% when flow rate 60 mL/min at various flow rate.
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