망간산화물(BIRNESSITE)에 의한 수용액 중 TETRACYCLINE의 산화-변환반응에 대한 연구

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 examinedthe potential effect of the naturally occurring substances, humic acid (HA) on the oxidative transformation. The experiment wascarried out in various conditions (reaction time, Mn oxide loadings, pH) and in the presence of HA as a batch test. The removalsof TTC followed pseudo-first order reactions, and rate constants (k, hr-1) for the removals of TTC were constantly increased withdecreasing pH from 0.98 (pH 9) to 2.97 (pH 3). The rate constants also increased about 1.3 times when the birnessite loadingincreased 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 comparedto the control, and also showed the removal efficiencies of TTC in the birnessite mediated systems (TTC=0.25 mM, δ-MnO2=2.0g/L, pH 6) increased with increasing HA concentrations (1~10 mg-C/L). The results obtained from the oxidative transformation ofTTC and the effect of HA were discussed in terms of reaction characteristics and mechanism.