水葫芦对水溶液中Cu^(2+)、Zn^(2+)的吸附  

Adsorption of Cu^(2+),Zn^(2+) From Aqueous Solution With Water Hyacinth

作　　者：周晓勇[1] 田亚运 张举斌[1] 

机构地区：[1]福州大学石油化工学院,福建福州350116

出　　处：《湿法冶金》2015年第1期60-67,共8页Hydrometallurgy of China

摘　　要：研究了用水葫芦生物吸附剂从溶液中吸附Cu2+和Zn2+,考察了溶液pH、吸附剂用量、金属离子初始浓度、温度及吸附时间对Cu2+、Zn2+吸附率的影响,探讨了等温吸附、吸附热力学及动力学。结果表明:pH是影响吸附效果的重要因素,pH在2~6范围内,随pH增大,金属离子去除率升高;水葫芦对Cu2+、Zn2+的吸附速度较快,80min左右即达平衡,吸附过程符合准二级动力学模型(R2>0.999);利用Langmuir等温方程进行拟合,得到水葫芦对Cu2+、Zn2+的最大吸附量分别为26.39和15.11mg/g;吸附热力学参数ΔG<0,表明水葫芦对Cu2+、Zn2+的吸附过程可自发进行;水葫芦经3次吸附解吸循环后,仍然保持较高的吸附性能。水葫芦价格低廉,产量大,在重金属废水处理方面有很好的应用前景。Water hyacinth was used as biosorbent to remove Cu^2＋and Zn^2＋from aqueous solution.The effect of solution pH,adsorbent dosage,initial concentration of Cu^2＋and Zn^2＋,temperature and agitating time on the sorption process were examined.Also,the isothermal adsorption,the adsorption thermodynamics and kinetics were investigated.The results show that the metal ions removal strongly dependent on solution pH and the sorption capacity increase with the increase of solution pH in the range of 2-6.The adsorption of Cu^2＋,Zn^2＋is quick and reach to adsorption equilibrium around 80 min.The sorption processes fit well with pseudo-second-order kinetic models（R^2〉0.999）.The maximal adsorption capacity of the biomass to Cu^2＋and Zn^2＋calculated from Langmuir isotherm equation are 26.39mg/g and 15.11mg/g,respectively.Thermodynamic parameters（ΔG0）indicates that the adsorption process is spontaneous.The water hyacinth adsorbent still maintains a high adsorption performance after three recycle.Therefore,the water hyacinth can potential application in wastewater treatment because of its high sorption capacity,low cost and large quantities.

关 键 词：水葫芦 生物吸附 重金属 动力学 

分 类 号：X703[环境科学与工程—环境工程]