The large-scale use of antibiotics is causing serious water pollution problems,and it is of great significance to develop new technologies to remove antibiotics from water.As an environmentally friendly and economical...The large-scale use of antibiotics is causing serious water pollution problems,and it is of great significance to develop new technologies to remove antibiotics from water.As an environmentally friendly and economical adsorption material,carbon derived from biomass is a low-cost and feasible material for removing antibiotics in sewage,but the current removal efficiencies are not high enough for large-scale practical application.In this study,poplar wood chips are used as raw material,and a magnetic biochar is prepared by co-pyrolysis of poplar wood chips and FeCl_(3)/CaCl_(2)mixed molten salt.X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),N_(2)-isothermal adsorption and desorption,X-ray photoelectron spectroscopy(XPS)and scanning electron microscope(SEM)techniques showed the successful synthesis of Fe_(2)O_(3)/bioC composite.In-situ formed Fe_(2)O_(3)makes the biochar possess the characteristic of superparamagnetic,which is conducive to the recycling of biochar.Due to the etching effect of the molten salts,rough surface was formed on Fe_(2)O_(3)/bioC,result-ing in a maximum norfloxacin(NOR)adsorption ability up to 38.77 mg g^(−1)at pH 6.0.The NOR adsorption behavior on Fe_(2)O_(3)/bioC followed the pseudo second order kinetic model and the equilibrium data was best fitted the Langmuir model.In addition,the adsorption process of NOR on Fe_(2)O_(3)/bioC was thermodynamically spontaneous.The results show that this low-cost and reusable magnetic biochar has the potential for rapid and efficient removal of antibiotic from aqueous solution.展开更多
基金National Natural Science Foundation of China,Grant Number:21908242.
文摘The large-scale use of antibiotics is causing serious water pollution problems,and it is of great significance to develop new technologies to remove antibiotics from water.As an environmentally friendly and economical adsorption material,carbon derived from biomass is a low-cost and feasible material for removing antibiotics in sewage,but the current removal efficiencies are not high enough for large-scale practical application.In this study,poplar wood chips are used as raw material,and a magnetic biochar is prepared by co-pyrolysis of poplar wood chips and FeCl_(3)/CaCl_(2)mixed molten salt.X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),N_(2)-isothermal adsorption and desorption,X-ray photoelectron spectroscopy(XPS)and scanning electron microscope(SEM)techniques showed the successful synthesis of Fe_(2)O_(3)/bioC composite.In-situ formed Fe_(2)O_(3)makes the biochar possess the characteristic of superparamagnetic,which is conducive to the recycling of biochar.Due to the etching effect of the molten salts,rough surface was formed on Fe_(2)O_(3)/bioC,result-ing in a maximum norfloxacin(NOR)adsorption ability up to 38.77 mg g^(−1)at pH 6.0.The NOR adsorption behavior on Fe_(2)O_(3)/bioC followed the pseudo second order kinetic model and the equilibrium data was best fitted the Langmuir model.In addition,the adsorption process of NOR on Fe_(2)O_(3)/bioC was thermodynamically spontaneous.The results show that this low-cost and reusable magnetic biochar has the potential for rapid and efficient removal of antibiotic from aqueous solution.
