Journal
JOURNAL OF OLEO SCIENCE
Volume 61, Issue 4, Pages 217-225Publisher
JAPAN OIL CHEMISTS SOC
DOI: 10.5650/jos.61.217
Keywords
sulfa drugs; activated carbon; ozone treatment
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology
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This study investigates the activated carbon (AC) treatment and ozone oxidation of the sulfa drugs - sulfamethoxazole (SMX), sulfamonomethoxine (SMM), sulfadimidine (SDD), and sulfadimethoxine (SDM) - in aqueous solution systems. Three AC samples were prepared from Shirasagi (AC1 and AC2) and coal (AC3), and the surface functional groups, solution pH, specific surface areas, pore volumes, and morphologies of the three samples were evaluated. The specific surface areas were in the following order: AC! (1391 m(2)/g) > AC2 (1053 m(2)/g) > AC3 (807 m(2)/g). The pore volume and mean pore diameter of AC3 were greater than those of AC1 and AC2. The concentration of sulfa drugs adsorbed onto the AC samples reached equilibrium within 150 h. Experimental data of the adsorption rate were fitted to a pseudo-second-order model. The amount of sulfa drugs adsorbed onto the AC samples was in the order of SUM < SMM < SDD < SMX; the mechanism of adsorption of the sulfa drugs onto the AC samples depended on the hydrophobicity of the AC surface. The adsorption isotherm data were fitted to Freundlich and Langmuir models. Ozone was generated from oxygen gas using an A-27 ozone generator, and the complete degradation of the sulfa drugs by ozone treatment at 60 mL/min was achieved within 50 min. Ozone treatment caused the structure of the sulfa drugs to decompose via ozone oxidation.
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