期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 294, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2022.121179
关键词
MXene; Amidoxime group; Uranium; Europium; Adsorption
资金
- National Natural Science Foundation of China [21906052, U2067215]
- National Key Research and Development Program of China [2017YFA0207002]
- Beijing Outstanding Young Scientist Program
In this study, amidoxime-modified Ti3C2Tx nanosheets (TC-AO) exhibiting high stability and positive affinity were successfully prepared. TC-AO showed excellent removal efficiency, fast reaction kinetics, and good stability, making it a promising material for the extraction and treatment of radioactive pollutants.
Although two-dimensional transition metal carbides and carbonitrides (MXenes) are becoming increasingly popular in contaminant remediation field, the preparation of MXene nanosheets that can efficiently eliminate the target pollutants still deserves in-depth investigation. Here we produced amidoxime Ti3C2Tx nanosheets (TC-AO), which were efficient radionuclide adsorbents with high stability and positive affinity, by introducing the amidoxime group into the Ti3C2Tx MXene surface through grafting by diazonium salt. The high stability and abundant functional groups of TC-AO were demonstrated by different characterization techniques such as scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analyzer (TGA), and X-ray photoelectron spectroscopy (XPS). Multiple factors affecting the radionuclide removal performance were explored, including reaction time, temperature, pH, ionic strength, anions and cations. The experimental results demonstrated that the radionuclide uptake by TC-AO was a heatabsorbing, spontaneous single-molecule chemisorption process and was consistent with the pseudo-secondary and Langmuir models. When pH < 6, the mechanism of uranium removal was inner complexation, and as the pH continued to increase, uranium removal shifted to outer complexation. Furthermore, the results certificated that TC-AO exhibited fast reaction kinetics (reaching equilibrium in about 20 min), excellent removal efficiency (279.57 mg U.g(-1) and 73.99 mg Eu.g(-1)), outstanding selectivity and good stability. The studies showed that TC-AO had good stability and functionality, which was not only valuable for the design of MXene based adsorbents, but also provided a meaningful option for the extraction of radioactive pollutants from wastewater.
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