向日葵秸杆对铜离子的吸附特征研究

[目的]以寻求廉价而高效的生物吸附材料为目的,研究向日葵秸杆对铜离子的吸附性能。[方法]以向日葵秸杆为主要原料,对含Cu2＋的模拟废水进行了吸附试验。[结果]吸附作用受pH值影响明显,在pH值为6.00时,吸附量最大;向日葵秸杆吸附量随温度的升高而增大,Freundlich方程更适合描述Cu2＋在向日葵秸杆上的吸附行为;对吸附热力学参数ΔG、ΔS、ΔH的计算表明,吸附反应具有自发性、吸热特性。[结论]向日葵秸杆是一种优良的处理铜离子废水的生物材料。

The Characteristics of Cu2+ Adsorbed by Sunflower Straw

[Objective]For the purpose of looking for cheap and high effective bioadsorption materials,the removal of Cu2+ from aqueous solution by sunflower straw were studied.[Method]The Cu2+ in simulation wastewater were absorbed by the sunflower straw as raw materials.[Results]The results showed that adsorption of Cu2+on to sunflower straw affected remarkably by the pH value,and the maximum adsorption amount was achieved at an optimum pH of 6.00;the equilibrium adsorption amount increase with the increasing of temperature,and the adsorption behavior might be depicted frimly by Freundlich function;the calculated result of thermodynamic parameters,such as ΔG,ΔS and ΔH,showed that the overall adsorption process was endothermic and spontaneous.[Conclusion]The sunflower straw was a kind of good bioadsorption material to deal with the heavy metal ions sewage.