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폴리올과 붕산의 착화합물 형성원리를 이용한 수용액 중의 보론 제거에관한 라만 분광학 연구
엄기헌 ( Ki Heon Eom ),정희철 ( Hui Cheol Jeong ),안혜영 ( Hye Young An ),임준혁 ( Jun Heok Lim ),이제근 ( Jea Keun Lee ),원용선 ( Yong Sun Won ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.6
Boron is difficult to be removed from seawater by simple RO (reverse osmosis) membrane process, because the size of boric acid (B(OH)3), the major form of aqueous boron, is as small as the nominal pore size of RO membrane. Thus, the complexation of boric acid with polyols was suggested as an alternative way to increase the size of aqueous boron compounds and the complexation behavior was investigated with Raman spectroscopy. As a reference, the Raman peak for symmetric B-O stretching vibrational mode both in boric acid and borate ion (B(OH)4 -) was selected. A Raman peak shift (877 cm-1 →730 cm-1) was observed to confirm that boric acid in water is converted to borate ion as the pH increases, which is also correctly predicted by frequency calculation. Meanwhile, the Raman peak of borate ion (730 cm-1) did not appear as the pH increased when polyols were applied into aqueous solution of boric acid, suggesting that the boric acid forms complexing compounds by combining with polyols.