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| 망간산화물(birnessite)에 의한 수용액 중 Tetracycline의 산화-변환반응에 대한 연구 |
| 엄원숙, 김소희, 신현상 |
| 서울과학기술대학교 환경공학과 |
| Oxidative Transformation of Tetracycline in Aqueous Solution by Birnessite |
| Won-Suk Eom, So-Hui Kim, Hyun-Sang Shin |
| Department of Environmental Engineering, Seoul National University of Science and Technology |
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Received: December 26, 2014; Revised: January 27, 2015; Accepted: February 5, 2015. Published online: February 28, 2015. |
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| ABSTRACT |
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An investigation on the removals of tetracycline (TTC), which is a family of antibiotics widely founded in the environment, from the aqueous solution by birnessite(δ-MnO2)-mediated oxidative transformation was described. This study also examined the potential effect of the naturally occurring substances, humic acid (HA) on the oxidative transformation. The experiment was carried out in various conditions (reaction time, Mn oxide loadings, pH) and in the presence of HA as a batch test. The removals of TTC followed pseudo-first order reactions, and rate constants (k, hr-1) for the removals of TTC were constantly increased with decreasing pH from 0.98 (pH 9) to 2.97 (pH 3). The rate constants also increased about 1.3 times when the birnessite loading increased from 1 to 2 g/L. Presence of HA (5 mg-C/L, at pH≥6) caused some enhancement in the removals of TTC as compared to the control, and also showed the removal efficiencies of TTC in the birnessite mediated systems (TTC=0.25 mM, δ-MnO2=2.0 g/L, pH 6) increased with increasing HA concentrations (1~10 mg-C/L). The results obtained from the oxidative transformation of TTC and the effect of HA were discussed in terms of reaction characteristics and mechanism. |
| Key Words:
Tetracycline, Birnessite, Oxidative Transformation, Kinetic Constants, Humic Acids |
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