化学
吸附
水溶液
纳米片
解吸
动力学
X射线光电子能谱
三碘化物
傅里叶变换红外光谱
化学工程
无机化学
拉曼光谱
有机化学
物理化学
电解质
工程类
物理
光学
量子力学
色素敏化染料
电极
作者
Chao Yu,Xuejing Li,Jia-Shu Zong,Dongjiang You,Ai‐Ping Liang,Yanli Zhou,Xiaoqiang Li,Lei‐Lei Liu
出处
期刊:Inorganic Chemistry
[American Chemical Society]
日期:2022-08-23
卷期号:61 (35): 13883-13892
被引量:19
标识
DOI:10.1021/acs.inorgchem.2c01886
摘要
Radioactive iodine (129I and 131I), produced or released from nuclear-related activities, posed severe effects on both human health and environment. The efficient removal of radioiodine from aqueous medium and vapor phase is of paramount importance for the sustainable development of nuclear energy. Herein, a metal–organic framework (MOF) nanosheet with a positive charge was constructed for the capture of iodine for the first time. The as-synthesized ultrathin nanosheets, with a thickness of 4.4 ± 0.1 nm, showed a record-high iodine adsorption capacity (3704.08 mg g–1) from aqueous solution, which is even higher than that from the vapor phase (3510.05 mg g–1). It can be ascribed to the fully interactions between the extensive accessible active sites on the largely exposed surface of 2D MOF nanosheets and the target pollutants, which also gave rise to fast adsorption kinetics with relative high removal efficiencies in the low concentrations, even in seawater. Moreover, a facile recyclability with fast desorption kinetics can also be achieved for the MOF nanosheets. The excellent iodine removal performance in aqueous solution demonstrated that the electrostatic attraction between MOF nanosheets with a positive charge and the negatively charged triiodide (I3–, the dominant form of iodine in aqueous solution) is the driving force in adsorption, which endows the adsorbents with the characteristics of fast adsorption and desorption kinetics. The adsorption mechanism was systematically verified by the studies of ζ potential, Fourier transform infrared, X-ray photoelectron spectroscopy, and Raman spectra.
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