磁性CoFe_2O_4/MgAl-LDH去除水中的磷酸盐  

Adsorption of phosphate in aqueous phase using magnetic CoFe_2O_4/MgAl-LDH

作　　者：邓林[1,2] 施周[1,2] 彭晓旭[1,2] 王莉[1,2] 

机构地区：[1]湖南大学土木工程学院,长沙410082 [2]湖南大学建筑安全与节能教育部重点实验室,长沙410082

出　　处：《环境工程学报》2016年第2期586-592,共7页Chinese Journal of Environmental Engineering

基　　金："十二五"国家科技支撑计划项目(2012BAJ24B03)

摘　　要：采用共沉淀法制备了磁性复合材料Co Fe2O4/Mg Al-LDH,通过静态吸附实验研究了Co Fe2O4/Mg Al-LDH对磷酸盐的吸附性能,考察了吸附剂投加量、溶液p H值、吸附时间、温度、共存离子等因素对磷酸盐去除效果的影响。结果表明,在实验条件下,Co Fe2O4/Mg Al-LDH对磷酸盐的吸附量随溶液p H值的增大而逐渐降低,吸附的最佳p H值为1.5。磁性Co Fe2O4/Mg Al-LDH对磷酸盐的吸附动力学符合准二级动力学模型,吸附等温线符合Langmiur等温吸附模型,理论最大吸附容量为105.37 mg/g。吸附热力学参数表明,Co Fe2O4/Mg Al-LDH对磷酸盐的吸附是自发、吸热的过程。Magnetic Co Fe2O4/ Mg Al-LDH composite was synthesized through coprecipitation method. Batch experiments were carried out to study the effects of adsorbent dosage,solution p H,contact time,temperature and coexisting anions on the adsorption of phosphate using Co Fe2O4/ Mg Al-LDH. The results showed that the adsorbed amount of phosphate on Co Fe2O4/ Mg Al-LDH decreased with increasing the solution p H,and the optimum p H for phosphate adsorption was 1. 5. Kinetic and equilibrium studies indicated that the experimental data of phosphate were best described by the pseudo-second-order and Langmiur model,respectively,and the maximum adsorption capacity of Co Fe2O4/ Mg Al-LDH for phosphate was found to be 105. 37 mg / g. Thermodynamic parameters revealed that the adsorption process of phosphate on Co Fe2O4/ Mg Al-LDH was spontaneous and endothermic.

关 键 词：COFE2O4 MgAl-LDH 磁性 磷酸盐 吸附 

分 类 号：X703[环境科学与工程—环境工程]