N掺杂树脂基球形多孔炭的制备及其对抗生素的吸附性能

Preparation of N-doped spherical porous carbon and its adsorption performance for antibiotics

摘要:

采用阳离子交换树脂为原料,NH4HCO3为N源制备炭前驱体,再高温活化制备树脂基球形炭NSACx。采用自动氮气吸附仪(BET)、扫描电子显微镜(SEM)、傅立叶红外光谱仪(FTIR)、X-射线光电子能谱仪(XPS)、ZETA电位仪等对球形炭进行了表征,并考察其对盐酸金霉素(CTC)和左氧氟沙星(LEV)两种抗生素的吸附性能。实验结果表明NSACx具有球状分级多孔结构,当活化时间为2 h时制备的NSAC2的比表面积为1612 m2·g-1,总孔体积为1.39 cm3·g-1；NSAC2表面有丰富的含C,O和N的官能团,可以与抗生素分子发生静电吸附、氢键作用、Π-Π相互作用等反应；吸附等温线和吸附动力学符合Langmuir模型和拟二级动力学模型,NSAC2对盐酸金霉素和左氧氟沙星的理论最大吸附量分别为397 mg·g-1和645 mg·g-1,表现出优异的吸附性能。

Abstract:

The N-doped spherical porous carbon NSACx was prepared from carbon precursor using cation exchange resin as raw material and NH4HCO3 as N source at high-temperature activation. The surface physical and chemical properties for spherical porous carbon were characterized by BET、SEM、FTIR、XPS and Zeta, and the adsorption performance for chloramphenicol hydrochloride and levofloxacin on spherical porous carbon were investigated. The result showed that the NSACx has a spherical hierarchical structure, when the activation time is 2 h, the specific surface area of as-made NSAC2 is 1612 m2·g-1 and a total pore volume of 1.39 cm3·g-1; The surface of NSAC2 contains abundant C, O, and N functional groups, which can react with two antibiotics through electrostatic adsorption, hydrogen bonding, π-πinteraction; The adsorption isotherm and adsorption kinetics were consistent with Langmuir model and pseudo-second-order kinetic model, the theoretical maximum adsorption capacities of chloramphenicol hydrochloride and levofloxacin by NSACx are 397 mg·g-1and 645 mg·g-1, respectively, showing better adsorption performance.