石墨烯对氟苯尼考的吸附行为与机理研究

Adsorption behaviors and mechanisms of florfenicol by graphene

通过静态吸附实验研究了石墨烯对水中兽用抗生素FF的吸附性能,分析了吸附FF动力学、等温线以及不同pH和溶液中共存阴离子、抗生素的影响,并对吸附剂石墨烯进行了表征和再生性探究。结果表明,石墨烯吸附FF的最佳pH为2~7,氯离子对石墨烯吸附FF有轻微抑制作用,而硫酸根离子和硅酸根离子对吸附没有影响。石墨烯的吸附不具有选择性,三种其他抗生素都对石墨烯吸附FF有一定的影响,影响程度为氯霉素>盐酸林可霉素>氨苄霉素。可用Langmuir吸附等温线模型拟合,属于单分子层吸附,最大吸附量为12.10 mg/g,对FF具有良好的吸附容量,吸附动力学符合准一级动力学模型。FF在石墨烯上的吸附可能受静电相互作用、π-π相互作用和氢键作用。吸附再生实验证实,石墨烯是一种高效且可重复使用的去除水中FF的吸附剂。

The adsorption performance of the florfenicol on graphene in water was studied by static adsorption experiments.The adsorption kinetics,isotherms and the effects of pH,coexisting anions and antibiotics were analyzed.The characterization and regeneration of graphene were explored.The results showed that the optimum pH was 2-7,and Cl-had a slight inhibitory effect on the adsorption,while SO 42-and SiO 32-had no effect on the adsorption.The adsorption on graphene was not specific.Three other antibiotics had certain effects on the adsorption,and the degree of influence was chloramphenicol>lincomycin>hydrochloride ampicillin.It belongs to the monolayer adsorption and can be fitted by the Langmuir adsorption isotherm model.The maximum adsorption capacity was 12.10 mg/g.The adsorption kinetics conformed to the pseudo-first-order kinetic model.The adsorption of florfenicol on graphene may be affected by electrostatic interactions,π-πinteractions and hydrogen bonding.The adsorption regeneration experiments showed that graphene can be an efficient and reusable adsorbent for the removal of florfenicol from water.