磁性壳聚糖/膨润土复合吸附剂吸附Cu^(2+)  

Adsorption of Cu^(2+) using magnetic chitosan/bentonite composite

作　　者：施周[1,2] 刘立山[1,2] 杨秀贞[1,2] 邓林[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》2015年第12期5677-5682,共6页Chinese Journal of Environmental Engineering

基　　金："十二五"国家科技支撑计划资助项目(2012BAJ24B03)

摘　　要：以膨润土、壳聚糖、Fe_3O_4为原料,制备了在外加磁场作用下能实现快速固液分离的磁性壳聚糖/膨润土复合吸附剂。利用SEM、XRD、VSM、FTIR等分析手段对复合吸附剂的形貌及微观结构进行了表征。通过静态吸附实验研究了复合吸附剂对Cu^(2+)的吸附性能,探讨了溶液初始p H值、吸附剂投加量、吸附时间和吸附温度等对Cu^(2+)吸附效果的影响。结果表明,壳聚糖和Fe_3O_4均已负载到膨润土上。复合吸附剂吸附Cu^(2+)的效果随溶液p H值和吸附剂投加量的增加而增加,并最终趋于稳定;当吸附剂投加量为7.2 g/L、p H值为6、Cu^(2+)初始浓度为30 mg/L时,Cu^(2+)的去除率可达98.5%。吸附动力学和吸附等温线数据分别较好地符合准二级动力学模型和Langmiur吸附等温模型。热力学参数表明,吸附是自发、吸热的过程。A magnetic chitosan/bentonite composite with potential in rapid solid-liquid separation through a magnetic field was synthesized with bentonite,chitosan and Fe3O4. Characterization of the composite was assayed with SEM,XRD,VSM and FTIR. The adsorption of Cu^2＋from aqueous solution onto the composite was investigated as a function of various factors such as pH,adsorbent dosage,adsorption time and temperature with batch experiments. The results showed that chitosan and Fe3O4 were coated on the bentonite. The adsorption efficiency of Cu^2＋on the composite increased with the increase of the pH and the dosage of the composite. It could reach to98. 5% under the conditions of the initial Cu^2＋concentration of 30 mg/L,pH of 6 and adsorbent dosage of 7. 2g/L. The adsorption kinetics and isotherm of Cu^2＋onto the composite followed the pseudo-second-order and Langmiur model,respectively. Thermodynamic parameters studies revealed that the adsorption process was spontaneous and endothermic.

关 键 词：膨润土 壳聚糖 磁性 吸附 CU^2+ 

分 类 号：X703[环境科学与工程—环境工程]