Liu Ying, Liu Xiaohui, Dong Wenping, Zhang Lingli, Kong Qiang, Wang Weiliang
College of Geography and Environment, Shandong Normal University, Jinan, 250358, PR China.
School of Environment, Tsinghua University, Beijing, 100084, PR China.
Sci Rep. 2017 Sep 29;7(1):12437. doi: 10.1038/s41598-017-12805-6.
Activated carbon (AC) was modified by FeCl. Batch experiments were carried out to evaluate the characteristics of equilibrium, kinetics and thermodynamics of Sulfamethazine adsorption onto original and modified AC. The results showed that Fe treatment changed the surface area, pore volume and surface zeta potential and increased the number of surface oxygenic functional groups. The adsorption of Sulfamethazine on modified activated carbon (MAC) was significantly improved. Isotherm test results revealed that the adsorption isotherms of Sulfamethazine on MAC fit the Freundlich, Langmuir and Temkin equations well. The maximum adsorption quantity of Sulfamethazine on MAC was 17.2414 mg/g at 25 °C. The adsorption kinetics of Sulfamethazine on AC and MAC can be characterized by the pseudo-second-order model. The adsorption process was affected by membrane diffusion, surface adsorption and internal diffusion. The adsorption quantities of Sulfamethazine first increased and then decreased for pH between 3 and 10. The removal efficiencies decreased with increasing temperature, which is favorable for adsorption at low temperature. It was also found that the mechanisms of adsorption included micropore capture and electrostatic, hydrogen bonding, π-π electron donor-acceptor (EDA) and coordination interactions as well as other interactions.
用氯化铁对活性炭（AC）进行改性。进行了批量实验，以评估磺胺二甲嘧啶在原始AC和改性AC上的吸附平衡、动力学和热力学特性。结果表明，铁处理改变了表面积、孔体积和表面zeta电位，并增加了表面含氧官能团的数量。磺胺二甲嘧啶在改性活性炭（MAC）上的吸附显著改善。等温线测试结果表明，磺胺二甲嘧啶在MAC上的吸附等温线与Freundlich、Langmuir和Temkin方程拟合良好。在25℃时，磺胺二甲嘧啶在MAC上的最大吸附量为17.2414mg/g。磺胺二甲嘧啶在AC和MAC上的吸附动力学可用准二级模型表征。吸附过程受膜扩散、表面吸附和内扩散影响。在pH值为3至10之间，磺胺二甲嘧啶的吸附量先增加后减少。去除效率随温度升高而降低，这有利于低温吸附。还发现吸附机制包括微孔捕获以及静电、氢键、π-π电子供体-受体（EDA）和配位相互作用以及其他相互作用。
