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알칼리토 금속산화물이 함유된 붕규산염계 유리를 이용한 용액 중 Cr^(6+) 이온 제거 기구
백일희,임형봉,김철영 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.3
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 Ba2+ 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.
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