Adsorption Properties of Polyethylene Imine-functionalized Biochar Aerogel for Uranium
The synthesis of a polyethylene imine-functionalized biochar aerogels(LSBC-CTS/PEI)using lotus seed powder,chitosan and polyethylene imine as materials,and used for adsorption of U(Ⅵ)in wastewater was studied.The results show that LSBC-CTS/PEI exhibit a looser structure with interconnections,and contains very rich amine-based functional groups,which can provide more adsorption sites for U(Ⅵ)coordination.The selective adsorption of U(Ⅵ)by LSBC-CTS/PEI is greatly affected by pH.The adsorption is mainly composed of single-layer chemisorption,which belongs to a spontaneous endothermic process,and is more suitable for description by quasi-second-order kinetics and Langmuir isothermal adsorption model.The selectivity of LSBC-CTS/PEI to uranium is 84.91％,and the maximum adsorption capacity is 533.89 mg/g.The adsorption material has high adsorption capacity of uranium,good selectivity,and convenient separation of solid and liquid,so it has the certain value of application.
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