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담체를 포함하는 액막을 통한 크롬(VI) 이온의 추출에 관한 실험적 연구

Experimental Study on the Extraction of Chromium(VI) Ion through the Carrier-Containing Liquid Membrane

HWAHAK KONGHAK, June 1983, 21(3), 119-126(8), NONE
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Abstract

폐수중의 크롬(VI) 이온이 트리도데실아민을 담체로 포함하고 있는 W/O/W형태의 액막을 통하여 추출되는 현상을 실험적으로 분석하였다. W/O에멀젼의 안정성조건은 액막의 파괴도를 측정하여 얻어졌다. 계면활성제로서 Span 80의 농도를 3 wt%, 유기용매상에 대한 내부수용액의 부피비가 1/2일 때 모든 추출실험 영역에서 액막이 안정하였고, 이것을 기초로 하여 추출실험이 행하여졌다. 초기농도가 1,000 ppm인 크롬(VI) 이온을 90 % 이상 추출하는데에는, 담체의 농도 3 wt%, 수산화나트륨의 농도 0.1 N, 에멀젼의 폐수에 대한 부피비 1/5의 조건에서 두 개의 교반조를 사용하여, 접촉시간을 약 10분정도로 하면 가능하다는 것을 알았다.
An experimental study has been made on the extraction of chromium(VI) ion through a W/O/W liquid membrane which contains tridodecylamine as a carrier. Operating conditions for the stable W/O emulsion, determined from the measurements of the emulsion breakups, were that the concentration of surfactant, Span 80, is 3 wt percent and that the volume ratio of the inner aqueous phase and the oil phase is 1/2. The extractions were carried out under these stable conditions. More than 90 % of chromium(VI) ion with its initial concentration of 1,000 ppm can be extracted with two stages in 10 minutes when the concentration of carrier is 3 wt percent, when the concentration of NaOH in the inner aqueous phase is 0.1 N, and when the volume ratio of the emulsion and the waste water is 1/5.

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