三维载铁石墨烯对四环素和环丙沙星类抗生素的吸附性能与机理

制备了三维载铁石墨烯材料(3D-rGO-Fe_(3)O_(4)),研究其吸附四环素(TC)、环丙沙星(CIP)等污染物的吸附性能与机理。实验结果表明,3D-rGO-Fe_(3)O_(4)对于TC和CIP均具有较好的吸附效果,与单一污染物相比,复合污染中两者的吸附量均有所降低。3D-rGO-Fe_(3)O_(4)对TC和CIP的吸附过程更符合准二级动力学吸附模型和Freundlich等温模型,模拟的最大吸附量分别为193.23 mg/g和119.56 mg/g,石墨烯对于CIP的吸附速度要快于吸附TC。经过4次重复实验后,3D-rGO-Fe_(3)O_(4)对于抗生素污染物的吸附容量下降幅度不到3%,显示了良好的重复性能。

Fe based three dimensional graphene(3D-rGO-Fe_(3)O_(4))was prepared via hydrothermal synthesis method and the adsorption performance and mechanism of its adsorption of tetracycline(TC),ciprofloxacin(CIP)and other pollutants were studied.The experimental results showed that 3D-rGO-Fe3O4 was an effective absorbent for TC and CIP.For the multipollutant,the adsorption capacity of both antibiotics reached the peak value was lower than that of single pollutant adsorption.The adsorption process of TC and CIP by 3D-rGO-Fe_(3)O_(4) more fitted pseudo-second-order kinetic adsorption model and the Freundlich isotherm model,and the theoretical maximum of adsorption capacities were 193.23 mg/g and 119.56 mg/g for TC and CIP,respectively,the adsorption of CIP was faster than TC.After four times of repeated experiments,the adsorption capacity of 3D-rGO-Fe_(3)O_(4) for antibiotic pollutants decreased by less than 3%,showing excellent repeatability.