含氮超交联多孔聚合物对磺胺甲嘧啶的吸附行为

Adsorption of Sulfadiazine by Hyper-linked Porous Polymer Containing Nitrogen

以2-苯基咪唑为功能单体,苯为助剂,通过一步Friedel-Crafts反应合成含氮超交联聚合物(hypercross-linked polymers,HCPs)。采用扫描电子显微镜、全自动微孔物理化学吸附仪和元素分析对聚合物表征进行分析,并对磺胺甲嘧啶进行吸附性能测试。结果显示,HCPs是由片状随机堆积链接成的多孔结构,比表面积高达1060 m^(2)/g。HCPs对磺胺甲嘧啶表现出良好的吸附性能,30 min即达吸附平衡,符合准二级动力学模型。磺胺甲嘧啶的等温吸附实验符合Freundlich模型,在含氮超交联聚合物上进行多层吸附。磺胺甲嘧啶的初始浓度为350ppm和溶液的pH=5.0时,HCPs的吸附量高达193 mg·g^(-1)。HCPs经过五次循环吸附脱附之后对磺胺甲嘧啶的吸附量仍能达到175 mg/g。

HCPs derived from 2-phenylimidazole and crosslinking agents such as benzene were synthesized via one-step Friedel-Crafts reaction.Scanning electron microscopy,automatic microporous physicochemical adsorption instrument,and elemental analysis were used for characterization analysis,and the adsorption performance of sulfanilamide were carried out.The results show that HCPs possesses the porous structure which is randomly linked by a lot of pieces,and the specific surface area reach 1060 m^(2)/g.HCPs showed good adsorption performance for sulfanilamide.The adsorption equilibrium was achieved 30 minutes,which conformed to the pseudo-second-order rate equation.The adsorption experiments of sulfanilamide were in accordance with Freundlich model,and multilayer adsorption was carried out on hyper-linked porous polymer containing nitrogen.The sulfanilamide adsorption capacity of HCPs reached 193 mg·g^(-1),when the initial concentration of sulfanilamide was 350ppm,and the pH of solution was 5.0.The adsorption capacity of HCPs for SMZ could remain at 193 mg·g^(-1) after five cycles.