水葫芦根粉对水环境中钒的吸附

Adsorption of vanadium from aqueous environment by Eichhornia crassipes root powder

通过批量吸附实验研究了水葫芦根粉作为水环境中钒吸附材料的可行性。分别探索了初始V^(5+)浓度、pH、水葫芦根粉用量和吸附时间对水葫芦根粉吸附钒的影响。结果表明,随着初始V5+浓度的增加和吸附时间的延长,水葫芦根粉对钒的吸附量均呈先增大后保持稳定的趋势。pH对水葫芦根粉吸附钒的影响显著,酸性条件更有利于吸附。当水葫芦根粉用量由25mg增至300mg时,其对钒的吸附量呈下降趋势。水葫芦根粉对钒的吸附过程符合Freundlich方程和准二级动力学模型,表明该过程以化学吸附为主,且钒易被水葫芦根粉吸附。

Batch adsorption experiments were carried out to study the feasibility of Eichhornia crassipes root powder as an adsorbent to remove vanadium from aqueous environment.The effects of initial V 5+concentration,solution pH,dosage of Eichhornia crassipes root powder and reaction time on removal of vanadium were explored,respectively.The results showed that:(1)with the increase of initial V 5+concentration and reaction time,adsorption capacity of vanadium by Eichhornia crassipes root powder increased and then reached equilibrium.(2)Solution pH had a great effect on vanadium adsorption by Eichhornia crassipes root powder,and acid environment was favorable to adsorption process.(3)Adsorption capacity decreased with the dosage of root powder increased from 25 mg to 300 mg.(4)Freundlich and pseudo-second-kinetic models could describe the adsorption process well,indicating that the adsorption process was spontaneous,and chemical reaction was the dominated process.