期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 255, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2020.117753
关键词
Amidoxime; Electroadsorption; Uranium-containing wastewater
资金
- National Natural Science Foundation of China [21976047]
- Fundamental Research Funds for the Central Universities [3072020CFT1503]
- China Postdoctoral Science Foundation [2019M651257]
- Decommissioning of nuclear facilities and special funds for radioactive waste management [[2017] 955]
This paper investigates the application of amidoxime-modified graphite felt electrode in the removal of uranium by electroadsorption. The results demonstrate that the electrode has good adsorption performance and reusability, making it suitable for uranium removal in water.
Electrode materials have an important influence on the performance of electroadsorption. In this paper, Polyacrylonitrile was introduced to the graphite surface by coating method, then amidoxime reaction was carried out by one-step hydrothermal method. The results of material analysis showed that the nitrile group were transformed to amidoxime group and the electrode had good thermal stability. The electrochemical test results demonstrated that the amidoxime-modified graphite felt electrode displayed a good specific capacitance of 46.5 F.g(-1) in 1 M NaCl solution at a scan rate of 5 mV.s(-1). The results of batch adsorption experiments showed that the adsorption capacity of uranium could reach 164.75 mg.g(-1) at -0.9 V (vs SCE). When sodium carbonate was used as eluent, the elution efficiency was 95% under the influence of reverse voltage (0.9 V). The adsorption capacity could reach 90% of the initial value after 5 times of reuse. The results indicated that the amidoxime-modified graphite felt had a good application prospect for removing uranium from water by electroadsorption method.
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