期刊
ENVIRONMENTAL POLLUTION
卷 248, 期 -, 页码 332-338出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2019.01.126
关键词
U(VI); Graphene oxide; Nano-alumina; XPS; Decontamination mechanism
资金
- National Natural Science Foundation of China [21822602, 71671065]
- Technology project of the headquarters of state grid corporation of China [KJGW2015-020]
The decontamination of U(VI) on graphene oxide/nano-alumina (GO/Al2O3) composites were investigated by batch, XRD, FT-IR and XPS techniques. The characterization results showed that GO/Al2O3 composites presented a variety of oxygen-containing functional groups, which provided the more surface reactive sites. The batch experiments indicated that sorption equilibrium of U(VI) on GO/Al2O3 composites was achieved within 30 min, and the maximum sorption capacity derived from Langmuir model was 142.8 mg/g at pH 6.5. In addition, the slight decrease of sorption capacity was observed even after fifth recycling times. These results indicated that GO/Al2O3 composites displayed the fast sorption rate, high sorption capacity and good regeneration performance. No effect of ionic strength revealed the inner-sphere surface complexation of U(VI) on GO/Al2O3 composites. FT-IR and XPS analysis demonstrated that the high adsorption of U(VI) on GO/Al2O3 was attributed to the various oxygen-bearing functional groups. In addition, the nano Al2O3 was transferred to amorphous AlO(OH) mineral phase by XRD pattern, which provided the additional reactive sorption sites. These observations indicated that GO-based composites can be regarded as a promising adsorbent for immobilization and pre concentration of U(VI) from aqueous solutions in the environmental remediation. (C) 2019 Elsevier Ltd. All rights reserved.
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