산업부산물인 순환골재 및 순환골재/제강슬래그 조합을 이용한 수용액상에서의 중금속 제거 특성

신우석; 김영기; Woo-Seok Shin; Young-Kee Kim

Applied Chemistry for Engineering, Vol.26, No.4, 477-482, August, 2015

DOI10.14478/ace.2015.1059 Export Citation

산업부산물인 순환골재 및 순환골재/제강슬래그 조합을 이용한 수용액상에서의 중금속 제거 특성

Removal Characteristics of Heavy Metals from Aqueous Solution by Recycled Aggregate and Recycled Aggregate/Steel Slag Composites as Industrial Byproducts

신우석, 김영기^{1, †}

국립한경대학교 해양과학기술연구센터
¹국립한경대학교 화학공학과

Woo-Seok Shin, and Young-Kee Kim^{1, †}

Institute of Marine Science and Technology Research, Hankyong National University, Anseong 456-749, korea, Korea
¹Department of Chemical Engineering, Hankyong National University, Anseong 456-749, korea, Korea

E-mail:

초록

본 연구에서는 순환골재와 순환골재/제강슬래그 조합을 이용하여 수용액상에서 Cr6+과 As3+ 흡착 특성을 평가하였다. 순환골재와 제강슬래그의 주요 성분(CaO, SiO2, Al2O3, Fe2O3)이 각각 91%와 86.9% 함유되어 흡착제로서 유리한 조성을 가지고 있다. 순환골재와 순환골재/제강슬래그 조합에 있어서 Cr6+과 As3+의 동역학적 평형은 각각 180 min과 360 min 이후에 도달하였다. 동적흡착결과를 유사 1차 모델과 유사 2차 모델로 분석한 결과 두 모델 모두 더딘 평형 결과를 나타냈다. 순환골재와 순환골재/제강슬래그 조합에 있어서, 평형흡착 실험은 Freundlich 모델에 잘 부합했고, Cr6+보다 As3+의 흡착량이 더 높았다. 용액의 pH가 6에서 10으로 증가함에 따라서 As3+의 흡착률은 증가하는 것으로 나타났다. 한편, Cr6+는 감소를 나타냈다. 본 연구 결과를 통해 순환골재 및 순환골재/제강슬래그 조합은 중금속(Cr6+, As3+)을 효율적으로 제거할 수 있는 흡착제로 판단된다.

This study examined the adsorption characteristics of heavy metal ions (Cr6+, As3+) in an aqueous solution using recycled aggregate (RA) and recycled aggregate (RA)/steel slag (SS) composites. The RA and SS are favorable for the absorbent because it contains about 91% and 86.9%, respectively, which are some of the major adsorbent ingredients (CaO, SiO2, Al2O3 and Fe2O3) for heavy metal. Kinetic equilibrium of Cr6+and As3+ in RA and RA/SS composites reached within 180 min and 360 min, respectively. The kinetic data presented that the slow course of adsorption follows the Pseudo first and second order models. The equilibrium data were well fitted by the Freundlich model and showed the affinity order of As3+ > Cr6+. The results of As3+ also showed that the adsorption capacity slightly increased with increasing pH from 6 to 10. Meanwhile, the adsorption capacity of Cr6+ was slightly decreased. From these results, it was concluded that the RA and RA/SS composites can be successfully used for removing the heavy metals (Cr6+ and As3+) from aqueous solutions.

Keywords:recycled aggregate;steel slag;adsorption;industrial byproducts;heavy metal

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