新型多胺类螯合树脂的设计、制备及其对重金属离子吸附特性的研究  

SYNTHESIS OF POLYAMINE CHELATING RESINS AND ADSORPTION PROPERTIES TOWARD HEAVY METAL IONS FROM AQUEOUS MEDIA

作　　者：徐超 刘福强[1] 巢路 朱长青[1] 李爱民[1] 

机构地区：[1]污染控制与资源化研究国家重点实验室,南京大学环境学院,南京210023

出　　处：《离子交换与吸附》2013年第6期481-495,共15页Ion Exchange and Adsorption

基　　金：国家自然科学基金(51078178)

摘　　要：利用多胺化合物对丙烯酸甲酯-二乙烯苯共聚物进行化学改性,并通过元素分析、红外光谱、比表面积及孔结构、X射线光电子能谱等结构分析方法进行表征,成功制备了多胺类螯合树脂PAMD。在pH值为3、温度为303K的条件下,PAMD对重金属离子有较理想的吸附效果。Langmuir方程能较好地拟合等温吸附线,PAMD对Cu(II)、Zn(II)和Ni(II)的吸附量分别达1.779mmol/g、1.498mmol/g和1.447mmol/g,分别为商业树脂Purolite S984的1.60倍、1.44倍和1.87倍。热力学结果显示所研究的树脂对3种重金属离子的吸附过程均属于熵推动的自发吸热过程。动力学结果表明平衡吸附量和初始吸附速率常数均遵循Cu(II)>Zn(II)>Ni(II)的顺序。在常规动态吸附条件下,Cu(II)与Ni(II)的穿透点分别为92BV和4BV,使用15%HCl对树脂再生,两种重金属离子的回收率均接近100%。Abstract： The polyamine chelating resins were synthesized by amination of tetraethylenepentamine with methyl acrylate-DVB copolymer beads, which were named as PAMD. The physical and chemical structures of the PAMD resin were characterized by elemental analysis （EA）, Fourier transform infrared spectroscopy （FT-IR）, particle size distribution （PSD） and X-ray photoelectron spectroscopy （XPS）. The specific adsorption efficiency of the PAMD resins for heavy metal ions were achieved at pH=3 and T=303K. The adsorption data could be fitted well with Langmuir model and adsorption capacity of PAMD was 1.779mmol/L for Cu（Ⅱ）, 1.498mmol/L for Ni（Ⅱ） and 1.447mmol/L for Zn（Ⅱ）, which was 1.60, 1.44 and 1.87 times higher than that of Purolite $984, respectively. The adsorption of heavy metal ions on PAMD resins was an entropy-driven, endothermic and spontaneous process. Kinetic constants of adsorption capacity and adsorption rate were in the order of Cu（Ⅱ）〉Zn（Ⅱ）〉Ni（Ⅱ）. Besides, the breakthrough point of Cu（Ⅱ） and Ni（Ⅱ） appeared when the volume of water approached 92BV and 4BV, respectively. In addition, the resin could be regenerated by 15% HCl solution with the desorption efficiency about 100%.

关 键 词：多胺类螯合树脂 重金属离子 吸附 特性 

分 类 号：TQ425[化学工程]