期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 610, 期 -, 页码 1015-1026出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.11.152
关键词
Polyacrylonitrile fiber; Swelling layer; Uranium; Seawater; Adsorption
资金
- NSFC-Nuclear Technology Innovation Joint Fund [U1967214]
- National Natural Science Foundation of China [51872057, 21905066]
- China Postdoctoral Science Foundation [2019 M663415]
- Fundamental Research Funds of the Central University
- Natural Science Foundation of Heilongjiang Province [QC2018010]
- International Science & Technology Coop-eration Program of China [2015DFR50050]
- Heilongjiang Tou-yan Innovation Team Program
In this study, an amino-reinforced amidoxime (ARAO) swelling layer was constructed on the surface of PAN fibers to prevent shrinkage and enhance adsorption performance. The PAN-NH2-AO exhibited high U(VI) and water adsorption capacities, and the adsorption process was spontaneous homogeneous chemical adsorption.
Polyacrylonitrile (PAN)-based materials have been studied for decades as uranium (U(VI)) adsorbents, because the further products of abundant nitrile groups, amidoxime (AO) groups, show great affinity for U(VI) ions. However, excessive amidoximation could cause the shrinkage of PAN fibers, resulting in decreased adsorption performance. Hence, an amino-reinforced amidoxime (ARAO) swelling layer was constructed on the PAN fiber surface (PAN-NH2-AO) by modification of the strongly hydrophilic amino group to prevent shrinkage. The molecular chains in the ARAO swelling layer would be swelled due to the adsorption of a large amount of water. Simultaneously, U(VI) ions can penetrate into the ARAO swelling layer with water molecules and coordinate with amino or AO groups, leading to increased adsorption performance. PAN-NH2-AO exhibited maximum U(VI) and water adsorption capacities of 492.61 mg g-1 and 20.32 g g-1 at 25 celcius with a swelling ratio of 20.73%, respectively. The adsorption capacity of PAN-NH2AO was 0.312 mg g-1 after a 91-day immersion in Yellow Sea, China. The study of the adsorption thermodynamics and kinetics of PAN-NH2-AO showed that the adsorption process was spontaneous homogeneous chemical adsorption. This paper proposes a novel method to obstruct amidoximation induced shrinkage and to maximize the potential application of PAN-based materials. (c) 2021 Elsevier Inc. 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