Abstract: PP-g-GMA-DETA chelating fibers were characterized by Fourier transform infrared and spectroscopy scanning electron microscope. The adsorption behavior and adsorption mechanism of PP-g-GMA-DETA chelating fibers on Pb²⁺ were investigated. The adsorption results showed that saturated adsorption capacity of PP-g-GMA- DETA chelating fibers on Pb²⁺ were 52.03 mg/g. The adsorption capacity increased gradually with the increase of pH in the pH range of 2-5;furthermore,it also increased rapidly with the increase of initial Pb²⁺ concentration. Besides, PP-g-GMA-DETA chelating fiber showed good selective adsorption ability,compared with Na⁺,Mg²⁺,Ca²⁺ and Fe³⁺ in the competitive adsorption process. The adsorption results were fitted well with a pseudo-second order model,which indicates chemical reaction is the main mechanism during the adsorption process and semi-saturation time was 13 min. The adsorption isotherm confirms well to a Langmuir model,which indicates the process is govered by monolayer adsorption. PP-g-GMA-DETA fibers were effectively and repetitively regenerated.

Key words: polypropylene, chelating fiber, Pb²⁺, adsorption, regeneration

摘要： 采用FT-IR、SEM对PP-g-GMA-DETA螯合纤维进行表征，并探究纤维对Pb²⁺的吸附特性及吸附机理。结果表明，PP-g-GMA-DETA螯合纤维对Pb²⁺的饱和吸附量为52.03 mg/g；在pH为2~5时吸附量随着pH的升高而增大，且随Pb²⁺初始浓度的增加而增大，并在Na⁺、Mg²⁺、Ca²⁺、Fe³⁺存在的竞争吸附过程中表现出选择性；吸附过程符合准二级动力学模型，主要受化学作用控制，半饱和吸附时间为13 min；吸附等温线符合Langmuir吸附等温线模型，为单分子层吸附，纤维可再生重复使用。

关键词: 聚丙烯, 螯合纤维, Pb²⁺, 吸附, 再生

CLC Number: 

• X703.1