聚丙烯酸钠/丙烯酰胺复合物的制备及其吸附  

Preparation and its adsorption of sodium polyacrylate/acrylamide composites

作　　者：谭凤梅 严琪 刘韩 张帆[1,2,3,4] TAN Feng-mei;YAN Qi;LIU Han;ZHANG Fan(College of Chemistry and Chemical Engineering;National Demonstration Center for Experimental Chemistry Education;The Collaborative Innovation Center of Manganese-Zinc-Vanadium Industrial Technology(the 2011 Plan of Hunan Province;Hunan Provincial Engineering Laboratory of Integrated Control and Remediation of Heavy Metal Pollution from Mn-Zn Mining,Jishou University,Jishou 41600,Hunan Province,China)

机构地区：[1]吉首大学化学化工学院 [2]吉首大学化学国家级实验教学示范中心 [3]吉首大学湖南省锰锌钒产业技术2011协同中心 [4]吉首大学锰锌矿业重金属污染综合防治技术湖南省工程实验室,湖南吉首416000

出　　处：《化学工程》2019年第11期19-24,共6页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(21566010);吉首大学本科生专项;吉首大学化学国家级示范中心项目(Jdx1821,2018ZXCX27)

摘　　要：以反相悬浮聚合法制备一系列聚丙烯酸钠和丙烯酰胺共聚物[P(AANa-co-AM)],运用傅里叶红外光谱(FT-IR)、热重分析(TG)等手段对其表征。研究了溶液pH值、单体配比、吸附时间、Pb 2+浓度和温度等因素对吸附性能的影响。结果显示,在最适pH值下,不同单体配比的聚丙烯酸钠/丙烯酰胺(AA/AM)吸附剂对Pb 2+的吸附效果不同,其中AA/AM单体配比为5∶5时,对Pb 2+的吸附效果最好。动力学研究表明,该复合材料对铅离子的吸附符合准二级模型;热力学实验数据显示,Langmuir模型比Freundlich模型更符合吸附等温线。当温度由298 K升高到318 K时,最大吸附量由591.7 mg/g增加到625.0 mg/g,热力学研究表明,P(AANa-co-AM)凝胶对Pb 2+的吸附为一自发吸热过程。A series of sodium polyacrylate and polyacrylamide copolymer composite gels[P(AANa-co-AM)]were prepared by reverse-phase suspension polymerization and characterized by Fourier Transform Infrared Spectroscopy(FT-IR)and Thermogravimetic Analysis(TG).The effects of solution pH,monomer ratio,adsorption time,concentration of Pb 2+and temperature on adsorption performance were studied.The results show that the adsorption effect of sodium polyacrylate/acrylamide(AA/AM)adsorbent of different monomer ratios on Pb 2+is different,and the best ratio of AA/AM monomer is 5∶5 under the optimum pH.The kinetic studies indicate that the adsorption of lead ions by the composite material conforms to the pseudo-second order model.The thermodynamic experimental data show that the Langmuir model is more suitable for adsorption isotherm than Freundlich model.The maximum adsorption capacity increases from 591.7 mg/g to 625.0 mg/g when the temperature increases from 298 K to 318 K.Thermodynamic studies show that the adsorption of Pb 2+by[P(AANa-co-AM)]gel is a spontaneous endothermic process.

关 键 词：反相悬浮聚合法 丙烯酸钠 丙烯酰胺 铅离子 吸附动力学 

分 类 号：O647.32[理学—物理化学]