聚丙烯酰胺树脂的制备及其对2,4-二氯苯氧乙酸的吸附性能研究  

Preparation of Polyacrylamide Resin and Its Adsorption Properties on 2,4-Dichlorophenoxyacetic Acid

作　　者：马梅花[1] 王晓中[1] 龚艳茹[1] 牛玉玲[1] 王玥[1] 王惠军[1] 罗瑞明[1] 龚波林[1] 

机构地区：[1]宁夏大学化学化工学院,银川750021

出　　处：《分析化学》2015年第3期379-386,共8页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(No.31271868);国家科技支撑课题(No.2012BAK17B07);宁夏自然科学基金项目(No.NZ12135)~~

摘　　要：以氯甲基化交联聚苯乙烯树脂(CMCPS)为载体和大分子引发剂,溴化亚铜/2,2'-联吡啶为催化剂体系,采用了表面引发原子转移自由基聚合技术(SI-ATRP),将丙烯酰胺接枝到CMCPS树脂表面,制得了新型聚丙烯酰胺树脂(PAM-CMCPS),并且用元素分析、扫描电镜和红外光谱对其进行了表征。考察了此树脂对2,4-二氯苯氧乙酸的吸附性能、动力学和热力学参数。结果表明,此树脂对2,4-二氯苯氧乙酸的吸附量随溶液初始浓度和温度的升高而增加,当初始浓度为8 mmol/L时吸附效果最佳,树脂的静态饱和吸附容量为111.0 mg/g,Langmuir和Freundlich方程都呈现良好的拟合度。热力学平衡方程计算得ΔG<0,ΔH=268.2 k J/mol,ΔS>0,表明此吸附过程是一个自发、吸热、熵增加的过程。动力学研究表明,准二级动力学方程能较好拟合动力学实验结果,该过程符合准二级动力学模型。此PAM-CMCPS树脂应用于柑橘样品中2,4-二氯苯氧乙酸的吸附,取得了较满意的结果。Polyacrylamide resin was synthesized via surface-initiated atom transfer radical polymerization（ SIATRP） method. Acrylic amide（ AM） was grafted onto the surface of the chloromethyl polystyrene resin via SI-ATRP in the Cu Br /2,2＇-bipyridine（ Bpy） system as catalyst at room temperature. The compositions of polyacrylamide resin were determined by means of elementary analysis,FT-IR analysis and scanning electron microscopy（ SEM）. The adsorption properties,the parameters of kinetics and the thermodynamics of the resin were evaluated in details,respectively. As the results,adsorption capacity of 2,4-dichlorophenoxyacetic acid（ 2,4-D） increased with the initial concentrations of solution increasing at room temperature,and its highest adsorption capacity was 111. 0 mg / g with solution concentration of 8 mmol / L. Adsorption isotherm at room temperature was determined and modeled with Langmuir and Freundlich equations. The thermodynamic equilibrium functions were calculated to be △G0,△H = 268. 2 k J / mol,ΔS0,hence,the adsorption was spontaneous,endothermic and entropy increasing. The kinetics fitted the pseudo-second-order well. The polyacrylamide-chloromethyl polystyrene（ PAM-CMCPS） resin was used for the adsorption of 2,4-D in orange sample,and good results were obtained.

关 键 词：氯甲基化聚苯乙烯树脂 表面引发原子转移自由基聚合法 吸附性能 2 4-二氯苯氧乙酸 

分 类 号：O631.3[理学—高分子化学] O647.3[理学—化学]