| 초록 |
In this study, we researched efficient use of bentonite sludge by the hydrothermal method. Cancrinite-type zeolite was synthesized from Korean bentonite by the hydrothermal method using aqueous Na+ without adding any extra silica and alumina sources. The acid treated bentonite mixture slowly added to the Na+ solution with various concentrations by vigorous stirring at room temperature. The final mixtures were placed in a convention oven at 368 K for 24 h. The final products were filtered and washed with deionized water, and then the products were dried at high temperature in an oven prior to characterization. The crystalline phases were identified as cancrinite-type zeolite. The high crystalline cancrinites were synthesized using high concentration Na+ solution. The surface area of synthesized cancrinites and bentonite sludge were 50.67 m2/g and 129.42 m2/g, respectively. This study showed that the activated bentonite sludge solution was converted to pure cancrinite with high crystallinity at optimized conditions. Based on the characterization results, alkali metal concentration is important key to synthesize open porous material from bentonite as layered one. |
