摘要
通过静态吸附实验,研究了麦秸改性剂、溶液pH值、吸附时间、麦秸投加量、U(Ⅵ)初始浓度、温度对麦秸吸附U(VI)的影响,并对吸附机理进行了探讨.结果表明,经NaOH改性后的麦秸吸附率有了显著提高,改性后比改性前吸附率提高约52%;在303K、pH值3.0时,吸附于120min左右趋于平衡,平衡吸附量为1.20mg/g;吸附过程为自发进行的吸热反应,符合Freundlich方程;吸附动力学过程可用准二级吸附速率方程来描述;改性麦秸对U(Ⅵ)的吸附表现为配位络合吸附机理.
The effects of modification agents,pH value,adsorption time,adsorbent dosage,solution initial concentration and temperature on biosorption capacity were investigated with static experiments,and the adsorption process was analyzed in thermodynamics and kinetics. The results showed that the adsorption rate of uranium（Ⅵ） on wheat straw increased about 52% after modifying by NaOH. At 303 K and pH 3.0,the saturated adsorption Qmax was up to 1.20 mg/g for approximately 120 min. The equilibrium data fit well with the Freundlich isotherm,and the adsorption reaction was endothermic and spontaneous. The pseudo-second-order equation provided the best correlation for the adsorption process. The mechanism of uranium（Ⅵ） adsorption matched the coordination complexation.
出处
《过程工程学报》
CAS
CSCD
北大核心
2010年第6期1084-1090,共7页
The Chinese Journal of Process Engineering
基金
湖南省自然科学基金资助项目(编号:10JJ3037)
关键词
麦秸
铀
改性
吸附
机理
wheat straw
uranium
modification
adsorption
mechanism
