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HWAHAK KONGHAK,
Vol.37, No.4, 575-581, 1999
Vol.37, No.4, 575-581, 1999
음이온교환수지에 의한 2,4,6-트리클로로페놀의 흡착특성에 관한 연구
A Study on Adsorption Characteristics of 2,4,6-Trichlorophenol by Anion Exchange Resin
음이온교환수지를 이용하여 25℃에서 2,4,6-trichlorophenol의 흡착평형과 미분층반응기에서의 총괄흡착도를 구하였다. 강염기성 이온교환수지인 SA20AP는 전체 pH범위에서 거의 비슷한 흡착능을 보였으며 약염기성 이온교환수지인 WA11은 pKa에서 최대 흡착능을 보였다. 반면 산성, 염기성 영역에서는 모두 흡착능이 감소하였다. 흡착등온선은 SA20AP가 보다 favorable한 형태를 보였으며, WA11은 더 많은 흡착능을 가졌다. 두 가지 흡착제에 대한 흡착등온선을 fitting한 결과 Freundlich식이 가장 잘 예측하였으며, WA11보다는 SA20AP가 더 잘 맞았다. 최적 유속인 403.68ml/min에서 구한 총괄흡착속도식은 다음과 같다.
r=0.017Cfc1.5848-(0.0113Ci-0.0434)qe0.2432Ci-0.5569
r=0.017Cfc1.5848-(0.0113Ci-0.0434)qe0.2432Ci-0.5569
Adsorption equilibria for 2,4,6-trichlorophenol were studied on anion exchange resins and overall adsorption rate was produced in differential bed tests. SA20AP(strongly basic anion exchange resin) showed similar adsorption capability in entire pH range and more favorable adsorption isotherm than WA11. However, WA11(weakly basic anion exchange resin) displayed more adsorption capability than SA20AP and maximum adsorption amounts at pKa of 2,4,6-trichlorophenol. Adsorption isotherms of both adsorbents were best fit in Freundlich isotherm and SA20AP showed much better fitted results than WA11. Overall adsorption rate at optimum flow rate(403.68 ml/min) was as follows;
r=0.017Cfc1.5848-(0.0113Ci-0.0434)qe0.2432Ci-0.5569
r=0.017Cfc1.5848-(0.0113Ci-0.0434)qe0.2432Ci-0.5569
Keywords:
Adsorption; 2; 4; 6-Trichlorophenol; Anion Exchange Resin; Freundlich Isotherm; Differential Bed Reactor
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