氧化铟改性聚丙烯酰胺复合材料吸附水中铅的研究  

Adsorption of Lead in Water by Indium Oxide Modified Polyacrylamide Composites

作　　者：李婉君 薛彦峰 LI Wanjun;XUE Yanfeng(Department of Chemistry and Chemical Engineering,Taiyuan Institute of Technology,Taiyuan,Shanxi 030008,China)

机构地区：[1]太原工业学院化学与化工系,太原030008

出　　处：《中国无机分析化学》2022年第5期34-40,共7页Chinese Journal of Inorganic Analytical Chemistry

基　　金：山西省应用基础研究计划项目(201901D111321);太原工业学院大学生创新创业项目资助(Gk2020102)。

摘　　要：环境中铅污染将威胁到生命体安全,因此去除过量的铅显得尤为重要。采用一锅法制备了复合材料吸附剂氧化铟改性的聚丙烯酰胺,通过扫描电子显微镜、N_(2)吸附-脱附仪和热重分析仪对吸附剂进行了表征。结合火焰原子吸收光谱法,研究其对水中的铅吸附性能。优化了溶液pH值及振荡时间对铅吸附的影响,并运用动力学和热力学研究了复合材料对铅的吸附行为。实验结果表明:在初始浓度为10 mg/L,溶液pH值为6.0,振荡时间为100 min时,铅的最大吸附量为9.689 mg/g;吸附行为符合拟二级动力学方程和Freundlich方程;当T=293.15 K时,ΔG=-8.38 kJ/mol,ΔH=23.90 J/mol,证明了复合材料对铅的吸附是自发进行,并且是吸热过程;经过3次吸附—解吸实验,复合材料对铅的解吸率仍大于87%,说明吸附剂的再生性能良好。The pollution of lead in the environment endangers life safety.Hence,the removal of excess lead is of prime importance.In this study,indium oxide modified polyacrylamide composites were prepared as the adsorbent by one-pot polymerization method.The composites were characterized through scanning electron microscope,N_(2) adsorption-desorption measurement,and thermal gravimetric analyzer.The composite adsorbent was utilized for the adsorption of lead in water combined with flame atomic absorption spectrometry.The conditions of adsorption experiments affecting the adsorption percentage were optimized,including the pH of solution and the contact time.In addition,the adsorption process of lead onto composites was carried out by using the studies of kinetics and thermodynamics.The experimental results indicated that the maximum adsorption capacity of lead is 9.689 mg/g,when the contact time is 100 min and the initial concentration is 10 mg/L at the pH of 6.0.Adsorption experiments manifested that the process could be fitted by a pseudo-second order equation and the Freundlich equation.When T=293.15 K,ΔG=-8.38 kJ/mol andΔH=23.90 J/mol.The thermodynamic parameters illustrated that the adsorption of lead onto the composites is endothermic and spontaneous in nature.The desorption ratio of lead still reached above 87%after the adsorption and desorption cycles 3 times,illustrating that the regeneration of the composites performs satisfactorily.

关 键 词：氧化铟纳米粒子 聚丙烯酰胺 一锅法 吸附 铅 

分 类 号：O657.31[理学—分析化学] TH744.12[理学—化学]