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J. Korean Ceram. Soc. > Volume 48(3); 2011 > Article
Journal of the Korean Ceramic Society 2011;48(3): 222.
doi: https://doi.org/10.4191/kcers.2011.48.3.222
알칼리토 금속산화물이 함유된 붕규산염계 유리를 이용한 용액 중 Cr6+ 이온 제거 기구
백일희, 임형봉, 김철영
인하대학교 신소재공학부
Mechanism of Removal of Cr(VI) Ions from Solution by Borosilicate Glasses Containing Alkaline Earth Oxides
Il-Hee Back, Hyung-Bong Lim, Cheol-Young Kim
Department of Materials Science and Engineering, Inha University
ABSTRACT
The hexavalent chromium ions in wastewater are highly toxic chemicals even at low concentrations. It causes serious diseases, such as cancer, skin disease, digestive trouble et. al. In this study, $Cr^{6+}$ ions were removed by using borosilicate glasses. Various glasses system with different compositions were prepared and then reacted in a solution contaning $Cr^{6+}$ ions. After the reaction, the concentration of the $Cr^{6+}$ ions remained in the solution was measured by ICP-OES. The reacted surface of the glasses was also analyzed by using a XRD, SEM, and EDS. When $Na_2O-RO-SiO_2-B_2O_3$ (RO=MgO, CaO, SrO, BaO) glasses were reacted with a solution containing $Cr^{6+}$ ions, the optimum removal efficiency of $Cr^{6+}$ ions was observed in the BaO glass. $Ba^{2+}$ ions leached out of these glasses combine with $Cr^{6+}$ ions in a solution to form $BaCrO_4$ crystals on the glass surface. In this manner, the $Cr^{6+}$ ions can be removed from the solution. It is conceivable that $Ba^{2+}$ ions are reacted with $Cr^{6+}$ ions in a solution immedeately after leaching out of the glasses. The pH of the solution for optimum removal of $Cr^{6+}$ ions were 3.0~5.0.
Key words: Hexavalent chromium, Wastewater, Borosilicate glass, Removal Efficiency, Leaching
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