Uranium removal performance and mechanism of polyaniline-modified pomelo peel biochar composite material
As an emerging clean energy source,nuclear energy can effectively replace traditional fossil fuels for high-pollution issues,and has developed rapidly in recent years.However,the process of mining,transportation,and utilization of nuclear fuel involves the leakage of radioactive isotope uranium(Ⅵ).A large amount of pollutants enter the water body,posing a threat to the environment and health of living organisms.In this study,we prepared biochar(BC)from grapefruit peel,which is one of the food wastes,and then modified it with polyaniline to make polyaniline/biochar(BC-PANI)composites.These composites were applied to the removal of U(Ⅵ)from water bodies.In this study,a series of characterization experiments,such as scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDS),X-ray diffraction(XRD),BET,and Fourier transform infrared spectroscopy(FT-IR),were conducted to confirm the successful preparation of BC-PANI materials with reactive groups.Subsequently,macroscopic batch experiments were conducted to investigate the effects of reaction time,temperature,pH,ionic strength,and other factors on U(Ⅵ)elimination.The results showed that the maximum adsorption capacity of BC-PANI for U(Ⅵ)at 328 K was 80.6 mg g-1,and the adsorption reached equilibrium in 15 min.Macroscopic experiments and X-ray photoelectron spectroscopy(XPS)analysis indicated that the efficient removal of U(Ⅵ)by BC-PANI was a synergistic effect of physical adsorption and redox.In addition,the recycling experiments of BC-PANI showed its better reusability and high economic efficiency.In conclusion,BC-PANI is an efficient,low-cost and recyclable material with great application potential,which can provide reference value for U(Ⅵ)pollution treatment of wastewater.
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