以NaOH改性前后的甘蔗渣为吸附剂,采用静态吸附法,研究了pH、离子强度、吸附时间、溶液浓度和温度等因素对改性前后甘蔗渣吸附水中Th(Ⅳ)的影响。结果表明:pH对吸附的影响较大,离子强度对吸附的影响较弱,表明Th(Ⅳ)在改性前后甘蔗渣上的吸附受表面络合控制;升高温度有利于吸附反应;改性前的甘蔗渣达到吸附平衡的时间为120min,改性后的甘蔗渣达到吸附平衡的时间为180min;改性前后甘蔗渣吸附Th(Ⅳ)的过程符合准二级动力学模型和Langmuir吸附等温模型,这表明Th(Ⅳ)在改性前后甘蔗渣上的吸附是受化学作用控制的单分子层的吸附。
Using bagasse modified by sodium hydroxide as the adsorbent,the factors affected Th(Ⅳ) adsorption such as initial pH,ionic strength,adsorption time,temperature and initial Th(Ⅳ) concentration on unmodified and modified bagasse were investigated with static experiments.It was found that the sorption of Th(Ⅳ) was influenced strongly by pH and weakly by ionic strength.The mechanism of Th(Ⅳ) adsorption matched the coordination complexation.The elevated temperature was conducive to the adsorption reaction.The equilibrium time for the adsorption of Th(Ⅳ) on unmodified and modified bagasse were 120min and 180min.Adsorption process could be fitted better with the pseudo-second-order kinetic model and the Langmuir isotherm,which indicating that adsorption for Th(Ⅳ) was a monolayer adsorption controlled by the chemical reaction.
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基金资助
国家自然科学基金资助项目(21761002、21501025);江西省质谱科学与仪器重点实验室开放基金资助项目(JSMS201607);核资源与环境省部共建国家重点实验室资助项目(NRE313)
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