纳米氢氧化铝-聚丙烯酰胺复合絮凝剂对镉离子的吸附研究  

STUDY OF CADMIUM ION ABSORPTION USING NANO ALUMINIUN HYDROXIDE-POLYACRYLAMIDE HYBRID FLOCCULATION

作　　者：粟燕[1] 刘人源 陈振玲[2,3] 

机构地区：[1]凯里学院,凯里556011 [2]中国民用航空局民用航空医学中心,北京100123 [3]民航总医院,北京100123

出　　处：《离子交换与吸附》2016年第4期324-332,共9页Ion Exchange and Adsorption

基　　金：国家自然基金(No.U1333132);中国民用航空局重大科技专项(MHRD20140101);贵州省科技厅;黔东南州科技局;凯里学院科技联合基金项目(黔科合LH字[2014]7236)

摘　　要：采用响应面法对纳米氢氧化铝-聚丙烯酰胺复合絮凝剂吸附Cd(II)过程进行了拟合和优化,分别以pH值、温度和Cd(II)浓度为自变量,研究了其对响应值镉离子最大吸附量的影响,并通过吸附动力学方程和吸附等温线数据对吸附机理进行了探讨。结果表明,采用响应面法对pH值、温度和Cd(II)浓度3个自变量进行优化后得出最大吸附量为79.07mg/g,其最优条件为:pH 6.35,镉离子浓度91.36mg/L,温度50℃;氢氧化铝-聚丙烯酰胺对Cd(II)的吸附在120min内达到平衡,且吸附动力学数据符合准二级动力学模型,表明吸附过程包含化学吸附;吸附速率的控制步骤是吸附脱附平衡步骤;吸附等温线数据与Langmuir吸附等温模型相一致,表明镉离子在氢氧化铝-聚丙烯酰胺表面形成的是单层吸附层。The effects of operating parameters such as pH, Cu（II） concentration and temperature on the Cd（II） adsorption were investigated for Al（OH）a-polyacrylamide by using a response surface methodology （RSM）, and the adsorption characteristics and mechanism were discussed based on the adsorption kinetics and thermodynamic. Results showed that Optimum Cd（II） uptake of 79.07mg/g was achieved at pH 6.35, Cd（II） concentrations 91.36mg/L, and temperature 50℃. The adsorption equilibrium was arrived at 120min, the adsorption process can be well described by the Pseudo-second-order kinetic model, and included chemical adsorption. Particle diffusion is not the only control step of adsorption, also included membrane diffusion. The experimental data of isotherm followed the Langmuir isotherm model, it showed Cd（II） in Al（OH）a-polyacrylamide belong to monolayer adsorption.

关 键 词：氢氧化铝-聚丙烯酰胺 吸附 响应面法 CD(II) 

分 类 号：TB34[一般工业技术—材料科学与工程]