Title of article :
Using Iron-copper Nanocomposites Prepared by Peanut Vine Extracts for the Removal of Pefloxacin and Enrofloxacin from an Aqueous Solution: Isotherms,Kinetics, and Mechanism
Author/Authors :
niu, y.y. zhengzhou university - school of chemical engineering, Zhengzhou, China , han, x.l. henan outstanding foreign scientists’ workroom, Zhengzhou, China , han, x.l. zhengzhou university - school of chemical engineering, Zhengzhou, China , liang, l.l. zhengzhou university - school of chemical engineering, Zhengzhou, China , chang, c. zhengzhou university - school of chemical engineering, Zhengzhou, China , chang, c. henan outstanding foreign scientists’ workroom, Zhengzhou, China , chen, j.y. zhengzhou university - school of chemical engineering, Zhengzhou, China , chen, j.y. henan outstanding foreign scientists’ workroom, Zhengzhou, China
Abstract :
In this research, ZnO-MgFe2O4/ZnAl-LDH, ZnO-MgFe2O4/MgAl-LDH, ZnO-MgFe2O4, ZnAl-LDH and MgAl-LDH were prepared and characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and FT-IR spectrometer analyses. The samples were synthesized by the co-precipitation method. The efficiency of the samples was investigated for the Congo red dye removal from the aqueous solution. According to the results, a similar efficiency for the LDHs samples and ZnO-MgFe2O4/LDHs composites was observed. The experimental data for the ZnO-MgFe2O4/ZnAl-LDH and ZnO-MgFe2O4/MgAl-LDH composites were analyzed by adsorption isotherm (Langmuir and Freundlich) and kinetic models (pseudo-first-order, pseudo-second-order, and intraparticle diffusion). The results showed that more than 90% of the Congo red dye was removed from the solution after 90 min contact time. The experimental results showed the adsorption process fitted well with the Langmuir isotherm model and pseudo-second-order kinetic model. For the ZnO-MgFe2O4/ZnAl-LDH and ZnO-MgFe2O4/MgAl-LDH samples, the RL value close to zero (0.024 and 0.037) was obtained. This result indicates that the adsorption of the CR dye molecules on the surface of the samples is an almost irreversible process. The low RL value indicates that the interactions between Congo red dye molecules and LDH composites might be relatively strong.
Keywords :
Adsorption , Iron , copper nanocomposites , Peanut vine , Pefloxacin , Enrofloxacin
