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Ca-Al-NO<sub>3</sub> 또는 Mg-Al-NO<sub>3</sub> 계열 층상이중수산화물을 이용한 염소이온 제거
김광덕 ( Gwang-deuk Kim ),오상화 ( Sanghwa Oh ),김홍태 ( Hong-tae Kim ) 한국수처리학회(구 한국수처리기술연구회) 2017 한국수처리학회지 Vol.25 No.4
Effects of molar ratio (x) and pH on calcium- or magnesium-aluminum layered double hydroxides (LDHs) syntheses and Cl- removal by ion-exchange with NO<sub>3</sub><sup>-</sup> in synthesized LDHs were investigated. The LDHs were synthesized under two systems such as Ca/Al-NO<sub>3</sub> (CAN) and Mg/Al-NO<sub>3</sub> (MAN). The weights of LDHs synthesized were calculated from the change of the mole of NO<sub>3</sub><sup>-</sup> removed during synthesis and compared to obtain the optimum condition. For synthesis of LDHs intercalated with NO<sub>3</sub><sup>-</sup>, the optimum molar ratios for the CAN and MAN systems were 0.25 and 0.20, respectively. The optimum pH for CAN and MAN syntheses were 11 and 10, respectively. Ion-exchange reactions of Cl- with NO<sub>3</sub><sup>-</sup> in both LDHs were finished within 10 minutes at Cl-/LDHs ratio of 0.1 (mol/mol). Increasing LDH dose led to increase linearly NO<sub>3</sub><sup>-</sup> release. However, as the dose of LDHs increased over 0.5 g/L, the NO<sub>3</sub><sup>-</sup> release was getting dominated by the dissolution of LDHs instead of ion-exchange according to mass balance analysis.