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황영기 경남대학교 환경문제연구소 2002 환경연구 Vol.25 No.-
In this study, NHCNFe film electrode derivatized on the nickel surface by the chemical and electrochemical methods was installed as a working electrode in the cobalt solution. The electrochemical ion exchange between NHCNFe and cobalt was performed through the repeated cyclic oxidation/reduction potential from -100 mV to 800 mV. Obtaining the peak current and charge passing through the redox reaction from the cyclic voltammograms, the reactivity and durability of NHCNFe were investigated in this study. They were also studied on the influence of potential scan rate and solution properties such as cobalt concentration, temperature, and PH. It was found that peak current density, charge passing through redox reaction, and reactivity of the electrochemically derivatized NHCNFe film electrode were higher at acidic solution, at lower concentration of cobalt, and at 30℃ among applied temperature range of 20℃ to 60℃. Peak current density increased with the potential scan rate by the magnitude of 0.7.
黃榮基 경남대학교 환경문제연구소 1982 환경연구 Vol.4 No.-
Electrochemical reaction experiments involving the cathodic deposition of copper from aqueous solutions containing supporting electolyte(0.1M H₂SO₄) have been performed for determination of mass transfer rates. Mass transfer data have been detected in a fluidized bed cathode reactor packed conducting copper particles. In this work fluid superficial velocity, hydraulic diameter and current density have been varied. The composite mass transfer coefficient and correcting factor are correlated respectively as follows; ακ_(L)=38.86ε^(1.72)(1-ε)^(-1.72)ι^(1.3)υ_(s)^(0.86)d_(p)^(1.72) and α=2.83×10⁴ε^(1.72)(1-ε)^(-1.72)ι^(1.3)υ_(s)^(0.35)d_(p)^(2.21)(by using Walker Eqn) α=1.34×10⁴ε^(2.16)(1-ε)^(-2.16)ι^(1.3)υ_(s)^(0.30)d_(p)^(2.15)(by using Hwang Eqn) in the range 21≤R_(e)≤250, S_(c)=1121
순환전위법에 의한 KNiFe(CN)_(6)의 세슘과 나트륨에 대한 이온 선택성 조사
황영기 경남대학교 신소재연구소 1997 論文集 Vol.8 No.-
nickel hexacyanoferrate(NHCF)[KNiFe(CN)_(6)] 막(film) 전극을 제조하여 나트륨과 세슘에 대한 이온 선택성을 순환전위법으로 조사하였다. NHCF 막 전극은 나트륨 용액에서는 340mV와 370mV 세슘 용액에서는 530mV와 630mV의 전극전위에서 각각 적하(load)와 용리(elute)가 최대속도로 일어났다. 막 전극의 특성은 나트륨형태에서 세슘형태로 쉽게 전환되고 혼합용액에서 세슘에 대한 선택도가 높다는 사실을 확인할 수 있었다. The preparation of nickel hexacyanoferrate(NHCF) [KNiFe(CN)_{6}] and the determination of its ion selectivity between cesium and sodium have been studied using cyclic voltammetry. Sodium was highly loaded in and eluted from NHCF film a t the electrode potential(vs SCE) of 340mV and 370mV. and cesium did at 530mV and 630mV. respectively. A film initially in the sodium form converted readily to the cesium. It was also found that the electroactive film had high affinity for cesium in a binary mixture concentrated with sodium.