GFH(Granular Ferric Hydroxide)를 이용한 불소 흡착연구

Abstract

Granular Ferric Hydroxide(GFH)의 불소제거제로의 적용가능성을 알아보기 위해 10 mg/L의 불소농도 조건에서 GFH의 불소 흡착능력을 평가하였다. GFH의 불소 흡착은 반응초기에 빠르게 진행되어 5분 이내에 흡착율이 50%에 이르렀고 30분 이내에 흡착평형에 이르렀다. 또한, GFH의 불소 흡착량은 0.052 mmol/g이었고 흡착 결과는 Langmuir 흡착등온식으로 가장 적합하게 모사되었다. 흡착 메커니즘을 규명하기 위하여 간단한 속도 모델인 Lagergren의 pseudo-first-order model과 Weber와 Morris의 intraparticle diffusion model을 적용하였다. GFH를 이용한 불소 흡착시스템은 pseudo-first-order model로 잘 설명되고, intraparticle diffusion model을 통해 잘 설명된다. 불소가 GFH에 흡착될 때, 표면에 흡착될 뿐만 아니라 GFH입자 내로의 분산도 일어나는 것으로 나타났다.

The present study was undertaken to evaluate the adsorption potential of Granular Ferric Hydroxide (GFH) for fluoride removal from water by batch mode. The adsorption capacity of GFH for fluoride was found 0.052 mmol/g at 25℃. The kinetic data reveal that uptake rate of fluoride on GFH was fast in the beginning, and 50% adsorption was occurred within 5 minutes. The equilibrium time for maximum uptake of fluoride on GFH was about 30 minutes. Two simplified kinetic models namely (i) Lagergren’s pseudo-first-order model and (ii) Weber and Morris intraparticle diffusion model were tested to describe the adsorption mechanism. It was found that the present system of fluoride adsorption on GFH was well described with pseudo-first-order kinetic model. The intraparticle diffusion model suggests that the mechanism of fluoride adsorption onto GFH is complex and surface adsorption as well as intraparticle diffusion contribute to the actual adsorption process.