철수산화물 나노입자를 이용한 수용액 내 비소의 흡착처리 연구
Adsorptive Removal of Aqueous Arsenic Using Nanoparticles of Iron Hydroxides
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합성한 나노크기의 철수산화물 akaganeite(β-FeOOH)와 ferrihydrite(Fe_5HO_8·4H_2O)를 흡착제로 이용한 As(III) 및 As(V)의 제거 실험을 수행하였으며 제거효율 비교를 위해 마이크로크기의 goethite(α-FeOOH)와의 비교 실험을 수행하였다. SEM 분석 결과 합성된 나노입자는 10~100 nm의 평균 입경을 가졌고 최대 150 nm 이하로 존재하였다. 전위차 적정을 이용한 영전하점 측정 결과 akaganeite와 ferrihydrite의 영전하점은 각각 7.8과 8.5로 측정되었다. Akaganeite를 사용한 경우 As(III)는 pH 8, As(V)는 pH 5에서, ferrihydrite의 경우 As(III)는 pH 7, As(V)는 pH 3에서 가장 높은 흡착 농도를 보였으며 pH가 8.5 이상이 되면 흡착 효율이 감소하였다. 비소의 두 화학종 모두에서 나노입자를 사용한 경우가 마이크로 입자에 비하여 더 높은 흡착 효율을 보였으며, 3.6 g/L의 나노입자 투입으로 거의 모든 비소가 용액으로부터 제거되었다.
Abstract
Adsorptive removal of aqueous As(III) and As(V) was investigated using nano-sized iron hydroxides, i.e., akaganeite (β-FeOOH) and ferrihydrite (Fe_5HO_8·4H_2O), as adsorbents which were synthesized in laboratory. The removal efficiency was compared with that of micro-sized iron hydroxide, goethite (α-FeOOH). SEM analysis showed that the diameter of the synthesized nanoparticles ranged 10~100 nm with maximum of 150 nm. Through a potentiometric titration technique, the points of zero charge of akaganeite and ferrihydrite appeared to be 7.8 and 8.5, respectively. Akaganeite led to maximum adsorbed concentrations of As(III) and As(V) at pH 8 and pH 5, respectively, and at pH 7 and pH 3, respectively, for ferrihydrite. When pH increased over 8.5, the adsorption efficiency dropped rapidly. Both nanoparticles kinetically reached adsorption equilibrium within two hours. Nanoparticles of akaganeite and ferrihydrite resulted in higher adsorption efficiency than goethite. When As solution was amended with the nanoparticles of 3.6 g/L, most aqueous As was removed from solution.
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