College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, PR China.
College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, PR China.
J Hazard Mater. 2020 May 15;390:122190. doi: 10.1016/j.jhazmat.2020.122190. Epub 2020 Jan 25.
Metal-organic framework based carbon material UC-X was prepared by template method, and adopted to remove cephalosporins from aqueous solution. The effect of templates including cetyltrimethyl ammonium bromide and sodium laurate was discussed. The UC-0.1 with the pore size of 5.38 nm has the best adsorption. According to FTIR spectrum, with the gradual increase of sodium laurate, the functional groups like CO increased, which promoted the adsorption capacity of cefepime in UC-X materials from 42.52 to 84.23 mg⋅g. The optimal conditions for the adsorption of cefepime were determined by the response surface method: the adsorption temperature was 25.8 °C, the initial pH value was 6.11, and the ionic strength was 1.13 g·L. Under the best adsorption condition, the adsorption-desorption experiments showed that the adsorption capacity of UC-0.1 material decreased by less than 10 % after five times usage, which indicated that its recycling property was competitive. The adsorption process conformed to the mixed-order kinetic model, and the error of equilibrium adsorption capacity between model fitting and actual experiments is not more than 1 %. The overall results of adsorption isotherm model and thermodynamic analysis demonstrated that Redlich-Peterson isothermal model could describe the adsorption process better.
采用模板法制备了基于金属有机骨架的碳材料 UC-X，并将其用于从水溶液中去除头孢菌素。讨论了模板（包括十六烷基三甲基溴化铵和月桂酸钠）的作用。具有 5.38nm 孔径的 UC-0.1 具有最佳的吸附效果。根据傅里叶变换红外光谱（FTIR），随着月桂酸钠的逐渐增加，CO 等官能团增加，从而使 UC-X 材料中头孢吡肟的吸附容量从 42.52mg·g 增加到 84.23mg·g。采用响应面法确定了吸附头孢吡肟的最佳条件：吸附温度为 25.8°C，初始 pH 值为 6.11，离子强度为 1.13g·L。在最佳吸附条件下，UC-0.1 材料经过五次使用后，吸附容量的下降幅度小于 10%，表明其回收性能具有竞争力。吸附过程符合混合级动力学模型，模型拟合与实际实验之间平衡吸附容量的误差不超过 1%。吸附等温线模型和热力学分析的综合结果表明，Redlich-Peterson 等温模型可以更好地描述吸附过程。
