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수용액에서 활성탄에 의한 올소인산의 제거

Removal of Orthophosphates from Aqueous Solutions by Activated Carbon

HWAHAK KONGHAK, October 1985, 23(5), 303-311(9), NONE
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Abstract

고-액계형의 반응은 고체입자의 세공을 통한 입자확산과 외부고체 입자의 표면에 대한 경막확산의 저항이 존재하여 복잡하다. 그러므로 경막 및 입자확산의 저항을 최소화하기 위한 조작상태를 정립할 필요가 있다. 확산으로 인한 저항을 제거함으로써 반응속도를 분석할 수 있다. 미분층 반응기를 사용하여 활성탄에 의한 올소인산 제거의 반응기구를 구명하는 반응속도식의 결과는 다음과 같다.
pH 4.0 : r = 0.0240Ce-0.0379Ci0.28qe0.80
pH 8.0 : r = 0.0179Ce-0.0361Ci0.28qe0.80
pH 12.0 : r = 0.00619Ce-0.0136Ci0.28qe0.80
본 반응속도식에서 pH 4.0의 제거속도가 pH 8.0 및 12.0보다 빠름을 알 수 있다. 그리고 올소인산 제거의 반응속도식이 평형에 도달하면 Freundlich흡착평형 등온선에 접근함을 알 수 있다.
pH변화에 따른 활성탄에 의한 올소인산의 최대흡착은 pH 4.5∼7.0에서 일어난다.
The liquid-solid type reaction encountered in this study is usually complicated by the presence of resistances as a result of film diffusion across the external solid surface and particle diffusion through the pores of solid. Therefore, it became necessary to establish the operating conditions that minimized the influence of film and particle diffusion. This investigation was an attempt to eliminate these diffusional effects and determine the kinetics of the removal of orthophosphates from the aqueous solutions by activated carbon using a differential bed reactor approach. The reaction kinetics studied in this experiment may be summarized as follows :
r = 0.0240Ce-0.0379Ci0.28qe0.80 at pH 4.0
r = 0.0179Ce-0.0361Ci0.28qe0.80 at pH 8.0
r = 0.00619Ce-0.0136Ci0.28qe0.80 at pH 12.0
A comparison of these equations indicates that the reaction kinetics at pH 4.0 is much faster as compared to those at pH 8.0 and 12.0. The equilibrium adsorption studies support the existence of this adsorption isotherm which fits the empirical Freundlich isotherm, comparatively. For activated carbon, maximum orthophosphates adsorption occured at pH 4.5-7.0 with decreasing amounts of adsorption at lower and higher pH.

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