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| Type |
Poster Presentation |
| Area |
환경에너지 |
| Room No. |
포스터발표장 |
| Time |
4월 20일 (목요일) 11:00~12:30 |
| Code |
ENVR.P-509 |
| Subject |
Enhanced bromate reduction by humic substances in ice |
| Authors |
민대위, 최원용1,*
POSTECH 환경공학과, Korea
1POSTECH 환경공학부, Korea
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| Abstract |
Bromate (BrO3-) is an important disinfection by-product (DBPs) formed during ozonation which is nowadays recognized as a carcinogenic and persistent pollutant. Reducing bromate into bromide is an essential process for detoxifying this toxic pollutant, however, not many studies have been done yet. In this work, we demonstrate a new transformation pathway that bromate could be efficiently reduced by freezing the bromate solution in the presence of organic reductants like humic substances. The results show that the amount of eliminated bromate for 1day reaction is 30~40% in dark condition and 80~90% in irradiation condition (λ > 300 nm) in frozen solution, while less than 5% bromate is reduced in aqueous solution. This significant enhancement in ice is due to the freeze concentration effect. XPS measurement shows the oxidation of humic substance during bromate reduction in frozen solution. Photoluminescence revealed the electron transfer from organic compounds to bromate is much enhanced in frozen condition. These results suggest that freezing process in icy environment would provide unique chemical circumstance for reduction of persistent pollutant in nature. |
| E-mail |
mdw0707@postech.ac.kr |
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119th General Meeting of the KCS