期刊
CHEMICAL ENGINEERING JOURNAL
卷 389, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124441
关键词
amidoxime functionalized SiO2; Uranium adsorption; Environmental remediation; Porous materials; Click reaction
资金
- National Natural Science Foundation of China [21704084, 21975206]
- Shaanxi Innovative Talents Promotion Plan-the Young Star of Science and Technology Project [2019KJXX-67]
- National Natural Science Foundation of Shaanxi [2018JM2028]
- Fundamental Research Funds for the Central Universities [310201911cx023]
The demand for low-cost adsorbent and method for efficient adsorption of metal ions for environmental and energy applications is highly required. The novel amidoxime functionalized silica framework (SiO2-AO) is prepared through a step by step process including ultrasonic-assisted oil-water emulsion method, surface sulfhydrylation, click reaction and modification of amidoxime. The hexane/water emulsion system in the presence of hexadecyltrimethylammonium bromide (CTAB) gives a large specific surface area of the precursor (SiO2-OH) and final products. The spectroscopic characterization combined with kinetics and isothermal studies reveals that the interaction between U(VI) and SiO2-AO is usually through coordination complexation. The adsorption behavior of SiO2-AO for U(VI) adsorption is explored through various batch methods including the effect of U (VI) concentration, pH, contact time and adsorbent dosage. It is revealed 99.9 +/- 0.5% U(VI) adsorption occurs at pH = 8, which is close to the pH of seawater. The highest U(VI) adsorption capacity obtained from the Langmuir adsorption model is 955.8 mg g at room temperature. The high removal rate (above 85%) at low U (VI) initial concentration (3 mu g L-1), excellent selectivity of U(VI) in presence of coexisting ions and high adsorption efficiency of regenerated adsorbent in sixth cycle refer SiO2-AO as a potential adsorbent for U(VI) adsorption in the practical field.
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