【摘要】 对纯化后的多壁碳纳米管(MWCNTs)采用甲醛进行羟甲基化改性,研究了改性后的MWCNTs对铀的吸附性能,考察了介质酸度、温度、超声时间、溶液初始浓度以及改性MWCNTs加入量对铀的吸附量和吸附率的影响。结果表明,改性MWCNTs在水溶液中的分散性良好,在pH为2.0～7.0范围内,改性MWCNTs对铀的吸附量和吸附率随pH增大而升高。铀的吸附量随初始浓度的增大而升高,铀初始浓度为50μg/mL时,吸附量达46.44mg/g,对铀的吸附率达90%以上。温度、超声时间和离子强度对其吸附量影响不大。吸附反应符合Langmuir和Freundlich方程,最大理论吸附容量为55.87mg/g。更多还原

【Abstract】 Purified multiwall carbon nanotubes(M WCNTs) were modified with formaldehyde and the dispersibility of MWCNTs was greatly improved after modification.The modified MWCNTs were used to study the adsorption of uranium from aqueous solution.pH, contact time, temperature, initial concentration of uranium and modified MWCNTs concentrations were investigated to estimate the adsorptive properties.The results show that uranium adsorption percentage strongly depends on the pH,i nitial concentration of uranium and modified MWCNTs content, and is slightly influenced by contact time, temperature and ionic strength.The adsorptivity increases over the range of pH=2.0-7.0.The maximum adsorptivity is 46.44mg / g as the initial concentration of uranium reaches 50 μg / mL.The equilibrium data obey both Langmuir and Freundlich isotherms well, and the maximal theoretical adsorption capacity is 55.87mg / g for the modified MWCNTs.更多还原