Adsorption of Eu (Ⅲ) on natural bamboo and wood fiber as a function of the solid-liquid ratio, pH values, ionic strength, humic acid, contact time and the temperature was investigated under ambient conditions with spectrophotometry and batch method. Meanwhile, the adsorption kinetics and thermodynamics were also discussed. The results show that the effect of pH on adsorption is obvious. Background ions inhibit the adsorption of Eu (Ⅲ) onto the fibers, and the addition of humic acid gives a positive influence at low pH range, while gives a negative influence at high pH range. Under the experimental conditions, wood fiber has a stronger adsorption capacity for Eu (Ⅲ) than bamboo fiber. The adsorption kinetics and thermodynamic properties of Eu (Ⅲ) on bamboo and wood fibers conform to the pseudo-second-order kinetic model and Langmuir isotherm model. The maximum adsorption capacity of Eu (Ⅲ) on bamboo and wood fiber is 17.78 and 18.54 mg·g-1. The thermodynamic functions show that adsorption of Eu (Ⅲ) on the natural fibers is an endothermic and spontaneous process.%采用分光光度法和批处理法研究了Eu (Ⅲ) 在天然竹纤维和木纤维上的吸附行为, 考察了固体投加量、pH、离子强度、腐殖酸、接触时间、温度等因素对吸附的影响, 讨论了Eu (Ⅲ) 在竹纤维和木纤维上的吸附动力学和热力学.结果表明, pH对吸附的影响明显;背景离子会抑制Eu (Ⅲ) 在竹纤维和木纤维上的吸附;在低pH值下, 腐殖酸对吸附有强化作用, 在高pH值下, 腐殖酸对吸附有抑制作用.Eu (Ⅲ) 在竹纤维和木纤维上的吸附符合准二级动力学模型和Langmuir吸附等温模型, 最大吸附量分别为17.78和18.54 mg·g-1.热力学函数计算结果表明, Eu (Ⅲ) 在竹纤维和木纤维的吸附为自发且吸热的过程.
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