【摘要】 研究了以磁性纳米Fe₃O₄为原料,利用水热反应法制备碳包覆磁性Fe₃O₄颗粒复合基体（Fe₃O₄@HTC）,然后用氢氧化钠改性得到Fe₃O₄@HTC-NaOH。考察了溶液pH、铀初始质量浓度、吸附时间和温度对Fe₃O₄@HTC-NaOH吸附铀的影响。结果表明:在溶液中铀质量浓度100 mg/L、溶液pH=5.5、室温条件下吸附200 min后,Fe₃O₄@HTC-NaOH对铀的最大吸附量为456.67 mg/g;吸附过程中自发吸热,反应符合准二级动力学模型和Langmuir吸附等温模型;经过5次重复使用,Fe₃O₄@HTC-NaOH对铀的吸附量仍高达初始吸附量的77.43%,可重复使用。更多还原

【Abstract】 Carbon-coated magnetic Fe₃O₄ particle composite（Fe₃O₄@HTC） was synthesized by hydrothermal reaction with magnetic nano-ferric oxide as raw material.The modification of Fe₃O₄@HTC by NaOH then adsorption of uranium（Ⅵ） from waste water was researched.The effects of pH,initial concentration of uranium（Ⅵ）,adsorption time and temperature on the adsorption capacity of Fe₃O₄@HTC-NaOH for uranium（Ⅵ） were investigated.The results show that the maximum adsorption capacity of 456.67 mg/g can be achieved within 200 min under pH of uranium solution of 5.5.The kinetic studies show that the adsorption process can be well simulated by pseudo second-order rate equation.The thermodynamics analysis results indicate that the adsorption process can be described by Langmuir adsorption isotherm equation,and the adsorption reaction is a spontaneous endothermic.During dynamic absorption-elution experiments,good reusability and high desorption efficiency of Fe₃O₄@HTC-NaOH for uranium（Ⅵ） are obtained with the fifth utilization of 77.4%.更多还原