微波合成淀粉基水凝胶的Pb^(2+)吸附性能  

Synthesis and Characterization of Starch-Graft-Acrylic Acid Hydrogels under Microwave Irradiation for Adsorption of Pb^(2+)

作　　者：刘子杰[1] 梁兴唐[1] 钟书明[1] 张瑞瑞[1] 焦淑菲[1] 尹艳镇[1] 

机构地区：[1]钦州学院石油与化工学院,广西钦州535000

出　　处：《精细化工》2016年第10期1135-1140,1182,共7页Fine Chemicals

基　　金：广西高校科学技术研究项目(2013LX159);广西高校化学工艺重点学科基金资助项目(2015KLOG20)~~

摘　　要：以木薯淀粉为原料,微波辅助接枝丙烯酸合成了水凝胶(SAH)。采用SEM、FTIR、XPS对SAH进行了表征,考察了SAH对Pb^(2+)的吸附机理;进一步考察了微波功率、pH、吸附温度、吸附时间和Pb^(2+)的初始浓度对吸附的影响。结果表明,SAH具有三维多孔结构,主要通过与Pb^(2+)形成双配位络合物实现对Pb^(2+)的吸附。微波功率为300 W时制备的SAH,在pH为6.09、吸附时间为60 min、Pb^(2+)初始浓度为0.005 mol/L、吸附温度为30℃的条件下,吸附量可达561 mg/g。SAH可重复利用,重复使用4次后其吸附量为458 mg/g。吸附过程符合准二级动力学模型和Langmuir等温吸附模型。Hydrogels（SAH） were synthesized under microwave irradiation by graft copolymerization of acrylic acid onto cassava starch. The structure and morphology of the optimized product were characterized by FTIR,SEM and XPS. The SAH was used to investigate the adsorption mechanism of Pb^2＋. Different factors affecting the absorption of Pb^2＋,such as microwave power,p H,adsorption temperature,contact time and initial Pb^2＋concentration were studied. It was found that the SAH had three-dimensional porous structure. The adsorption of Pb^2＋was accomplished by the formation of double coordination between the SAH and Pb^2＋. The SAH presented a maximum adsorption capacity of 561 mg/g when the absorption experiment was conducted in the conditions： under the microwave irradiation of 300 W,pH 6. 09,contact time 60 min,initial concentration of Pb^2＋0. 005 mol/L and adsorption temperature 30 ℃. The results also showed that the SAH exhibited a capacity of 458 mg/g after four adsorption-desorption cycles. The adsorption kinetic data conformed well to a pseudo-second-order kinetic model and a Langmuir isothermal adsorption model.

关 键 词：水凝胶 淀粉 铅离子 吸附 微波合成 水处理技术与环境保护 

分 类 号：TQ317[化学工程—高聚物工业] TQ085