Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
Mikrochim Acta. 2019 Jun 20;186(7):459. doi: 10.1007/s00604-019-3563-x.
Nanosheets prepared from magnesium oxide, chitosan and graphene oxide (MgO/Chit/GO) were hydrothermally synthesized and used as a sorbent for removal of ciprofloxacin and norfloxacin from aqueous solutions. Residual antibiotics in sample were determined by HPLC/UV instrument. The sorbent was characterized by FTIR, XRD, BET, SEM, and TEM. Its high adsorption capacity is attributed to the high surface area (294 m.g) as compared to bare MgO/chit or bare GO. The pore size of the mesoporous sorbent typically is 15 Å. The adsorption isotherms for the two model antibiotics studied (norfloxacin, ciprofloxacin) can be described with the Langmuir model, and the maximum adsorption capacities are 1111 and 1000 mg.g for ciprofloxacin and norfloxacin, respectively. The analysis of the kinetic data revealed that the synthesized sorbent followed pseudo-second-order kinetics and the maximum equilibrium was at over 120 and 150 min for ciprofloxacin and norfloxacin, respectively. Therefore, it is introduced as an economical, eco- friendly, and high-performance sorbent for removal of antibiotics from aqueous solutions. Graphical abstract Schematic presentation of dispersion of magnesium oxide/chitosan/graphene oxide (MgO/chit/GO) nanosheets in waste water for removal of ciprofloxacin and norfloxacin as water pollutants.
由氧化镁、壳聚糖和氧化石墨烯（MgO/Chit/GO）制备的纳米片通过水热法合成，并用作从水溶液中去除环丙沙星和诺氟沙星的吸附剂。通过 HPLC/UV 仪器测定样品中残留的抗生素。通过 FTIR、XRD、BET、SEM 和 TEM 对吸附剂进行了表征。与裸氧化镁/壳聚糖或裸 GO 相比，其高吸附能力归因于高表面积（294 m.g）。中孔吸附剂的孔径通常为 15 Å。所研究的两种模型抗生素（诺氟沙星、环丙沙星）的吸附等温线可以用朗缪尔模型描述，环丙沙星和诺氟沙星的最大吸附容量分别为 1111 和 1000 mg.g。对动力学数据的分析表明，合成的吸附剂遵循准二级动力学，对于环丙沙星和诺氟沙星，最大平衡分别在超过 120 和 150 min 时达到。因此，它被引入为一种经济、环保且高性能的吸附剂，用于从水溶液中去除抗生素。
