Adsorption of tetracycline in water by peony pod-based porous carbon material
To solve the problem of environmental pollution and resource waste caused by the incineration of peony pod waste,the possible transformation of this biomass to usable porous carbon was assessed.In this study,waste peony pods were the carbon source and KHCO3 the activator in a one-step activation process at 800℃,with an initial pod-to-activator mass ratio of 1∶3.The resulting pore-based carbon material had a well-developed pore structure,suitable for absorbing tetracycline in water.By adjusting the activation temperature and the mass ratio of peony pod to KHCO3,the optimal product PC-800-3 had a specific surface area 60 times higher than that of peony pod porous(PC)obtained by direct pyrolysis,and the maximum adsorption capacity for 100 mg·L-1 TC solution at 298 K was 394.3 mg∙g-1.The PC and PC-800-3 were characterized by specific surface area and pore size analysis,scanning electron microscopy,Fourier transform infrared spectroscopy,and X-ray diffraction.The results showed that the addition of activator promoted the formation of micropores and mesopores in the carbon material.PC-800-3 was selected for subsequent adsorption experiments.The fitting results of adsorption isotherm and adsorption kinetics showed that the adsorption process conformed to the Langmuir isotherm model and pseudo-second-order kinetics model.Thermodynamic experiments confirmed that the adsorption was a spontaneous endothermic process,mainly involving physical adsorption in the monolayer,with electrostatic interaction.The prepared PC-800-3 material exhibited good adsorption performance over a wide pH range and under ion interference.Regeneration experiments showed that PC-800-3 had good reusability.Therefore,converting peony pods into porous carbon to prepare high-performance adsorbents appears to not only solve the problem of antibiotic pollution in water,but also broaden the possible applications of this waste biomass.
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