N-苯基硫脲改性螯合纤维对水溶液中Hg（Ⅱ）的吸附性能∗

摘要

In this study,a new N-phenylthiourea (PTU)modified polypropylene fiber grafted acrylic acid (PP-g-AA-PTU)was prepared by EDC/NHS for fast and selective removal of Hg(Ⅱ)from water.The PP-g-AA-PTU fibers were characterized by FT-IR and SEM,discussing the initial concentration,temperature,pH and adsorption time on the adsorption of Hg(Ⅱ).The results showed that,in comparison with PP-g-AA fibers,the adsorptive equilibrium of PP-g-AA-PTU fibers could be reached within 10 min,and pH has no influence on ad-sorption process of Hg(Ⅱ)over the range of 3-8.The adsorption kinetics followed the pseudo-second-order model and equilibrium data were fitted well with Langmuir isotherms with the maximum adsorption capacity of 76.51 mg/g for Hg(Ⅱ).The chelating fiber held a good of selectivity for Hg(Ⅱ),and it enhanced the econom-ics of practical applications for the removal of Hg(Ⅱ)from aqueous solution.%以接枝丙烯酸的聚丙烯纤维(PP-g-AA)为基体材料,在1-乙基-3-(3-二甲氨丙基)碳二亚胺盐酸盐(EDC．HCl)和N-羟基琥珀酰亚胺(NHS)的作用下,将 N-苯基硫脲(PTU)修饰在 PP-g-AA 纤维上,得到新型功能化螯合纤维PP-g-AA-PTU,并研究了其对水溶液中 Hg(Ⅱ)的吸附行为.采用 FT-IR、XPS 等测试手段对螯合纤维进行表征,研究了溶液浓度、温度、pH 值、吸附时间对 Hg(Ⅱ)吸附性能的影响,并考察了纤维的选择性吸附.研究结果表明,PP-g-AA-PTU纤维在溶液 pH 值为3~8范围内,对 Hg(Ⅱ)的吸附性能无明显变化,在10 min内即可达到吸附平衡,吸附效果明显优于 PP-g-AA 纤维.吸附动力学符合准二级动力学模型,吸附等温线符合Langmuir模型,且饱和吸附量高达76．51 mg/g.该螯合纤维能对 Hg(Ⅱ)具有优异的吸附选择性,在水体中 H g(Ⅱ)的去除领域具有良好的应用前景.