Study on the adsorption of F-by Zr(Ⅳ) modified chitosan beads
The preparation of chitosan beads modified by Zr(Ⅳ) (ZrCh) were introduced,and at the same time their structure were characterized by FTIR and XRD.The initial pH value and coexisting anions on F-adsorption had been studied.The results showed that:(1) the FTIR and XRD analysis for ZrCh indicated that Zr(Ⅳ) involved in the adsorption of F-process.(2) Neutral and alkaline solution was beneficial for adsorbing F-.The rate of adsorption F-on ZrCh was fast and the adsorption equilibrium achieved in 60 min.When the equilibrium mass concentration was 1 mg/L,the adsorption equilibrium capacity of ZrCh reached 6.5 mg/g,and the actual maximum adsorbing capacity was above 15 mg/g at 20 ℃.(3) The adsorption dynamic model of F-on ZrCh conformed to pseudo-second-order dynamic model,and the isothermal adsorption conformed to Langmuir isothermal adsorption models.The adsorption of F-on ZrCh process was physical adsorption, which were mainly controlled by electrostatic forces and ion exchange of F-with OH-.
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