Study on the Effect and Mechanism of Beryllium Adsorption by Activated Carbon from Lotus Leaves
Beryllium-containing wastewater has serious environmental hazards.In order to find a low-cost and effective solution,lotus leaf activated carbon was prepared by hydrothermal pretreatment and used for the treatment of Be(Ⅱ)-contai-ning wastewater.The results showed that lotus biochar had excellent adsorption effect and could effectively remove beryllium from wastewater.Finally,the adsorption mechanism of activated carbon on beryllium from lotus leaf was studied by means of SEM,FTIR and XRD.The results showed that under the conditions of pH=3.0,initial beryllium concentration of 10 mg/L,ac-tivated carbon dosage of 3 g/L,adsorption temperature of 25℃and adsorption equilibrium time of 30 min,the optimal adsorp-tion efficiency of activated carbon of lotus leaf to beryllium was 99%.The adsorption of beryllium by activated carbon conforms to the quasi-first-order kinetic model and the Langmuir isothermal adsorption model.The Langmuir monolayer adsorption capac-ity of lotus leaf biochar was 30.26 mg/g.The adsorption mechanism of activated carbon to beryllium is mainly surface adsorp-tion and intra particle diffusion.By means of Fourier transform infrared spectroscopy(FT-IR)and X-ray diffraction(XRD),it can be seen that beryllium hydroxide precipitate was formed in the adsorption process of beryllium and the hydroxyl group on activated carbon.This study can contribute to the development of green materials for sustainable remediation of hydroberyllium pollution.
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