期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 323, 期 -, 页码 632-640出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2016.10.024
关键词
Cesium ions; Crown ethers; Host-guest systems; Cross-linked hydrogels; Adsorption
资金
- National Natural Science Foundation of China [21322605, 21490582, 81321002]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT15R48]
- State Key Laboratory of Polymer Materials Engineering [sklpme2014-1-01]
- Fundamental Research Funds for Central Universities at Southwest University for Nationalities [2015NZYQN67]
At present, selective and efficient removal of cesium ions (cs(+)) from nuclear waste is of significant importance but still challenging. In this study, an easy-to-get and low-cost hydrogel adsorbent has been developed for effective adsorption and removal of Cs+ from aqueous environment. The novel Cs+-recognizable poly(acrylic acid-co-benzo-18-crown-6-acrylamide) (poly(AAc-co-B18C6Am)) hydro gel is specifically designed with a synergistic effect, in which the AAc units are designed to attract Cs+ via electrostatic attraction and the B18C6Am units are designed to capture the attracted Cs+ by forming stable 2:1 sandwich complexes. The poly(AAc-co-B18C6Am) hydrogels are simply synthesized by thermally initiated free-radical copolymerization and display excellent Cs+ adsorption from commonly coexisting metal ions. Important parameters affecting the adsorption are investigated comprehensively, and the adsorption kinetics and adsorption isotherms are also discussed systematically. The poly(AAc-co-B18C6Am) hydrogels exhibit rapid Cs+ adsorption within 30 min and the adsorption process is governed by the pseudo-second order model. Adsorption isotherm results demonstrate that the equilibrium data are well fitted by the Langmuir isotherm model, indicating that the Cs+ adsorption is probably a monolayer adsorption process. Such Cs+-recognizable hydrogel materials based on the host-guest complexation are promising as efficient and feasible candidates for adsorption and removal of radioactive Cs+ from nuclear contaminants. (C) 2016 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据