Magnetic activated carbon was prepared by adding a magnetic material to activated carbon that had been prepared from waste citrus peel in Jeju. The adsorption characteristics of an aqueous solution of the antibiotic trimethoprim (TMP) were investigated using the magnetic activated carbon, as an adsorbent, and response surface methodology (RSM). Batch experiments were carried out according to a four-factor Box-Behnken experimental design affecting TMP adsorption with their input parameters (TMP concentration: 50～150 mg/L; pH: 4～10; temperature: 293～323 K; adsorbent dose: 0.05～0.15 g). The significance of the independent variables and their interaction was assessed by ANOVA and t-test statistical techniques. Statistical results showed that TMP concentration was the most effective parameter, compared with others. The adsorption process can be well described by the pseudo-second-order kinetic model. The experimental isotherm data followed the Langmuir isotherm model. The maximum adsorption capacities of TMP, estimated with the Langmuir isotherm model were 115.9-130.5 mg/g at 293-323 K. Also, both the thermodynamic parameters, △H and △G, have both positive values, indicating that the adsorption of TMP by the magnetic activated carbon is an endothermic reaction and proceeds via an involuntary process.

Abstract
1. 서 론
2. 재료 및 방법
    2.1. 실험 재료
    2.2. 흡착제의 특성 분석
    2.3. 실험 방법
    2.4. 실험계획법
3. 결과 및 고찰
    3.1. 흡착제의 특성
    3.2. 실험계획법
    3.3. 흡착 속도 해석
    3.4. 흡착 등온 해석
    3.5. 열역학적 해석
4. 결 론
감사의 글
REFERENCES

• 이창한(부산가톨릭대학교 환경행정학과) | Chang-Han Lee (Department of Environmental Adminstration, Catholic University of Pusan, Busan 46252, Korea)
• 이민규(부경대학교 화학공학과) | Min-Gyu Lee (Department of Chemical Engineering, Pukyong National University, Busan 48547, Korea)
• 허철구(제주대학교 환경공학과) | Chul-Goo Hu (Department of Environmental Engineering, Jeju National University, Jeju 63243, Korea)
• 감상규(제주대학교 환경공학과) | Sang-Kyu Kam (Department of Environmental Engineering, Jeju National University, Jeju 63243, Korea) Corresponding author