Decontamination of U(VI) on graphene oxide/Al2O3 composites investigated by XRD, FT-IR and XPS techniques

被引：99
作者：
Zhang, Lei [1 ]
Li, Ying [2 ]
Guo, Han [2 ]
Zhang, Huihui [2 ]
Zhang, Ning [2 ]
Hayat, Tasawar [3 ]
Sun, Yubing [2 ,3 ]
机构：
[1] North China Elect Power Univ, Sch Econ & Management, Beijing 102206, Peoples R China
[2] North China Elect Power Univ, Coll Environm Sci & Engn, Beijing 102206, Peoples R China
[3] King Abdulaziz Univ, Fac Sci, Dept Math, NAAM Res Grp, Jeddah 21589, Saudi Arabia
来源：
ENVIRONMENTAL POLLUTION | 2019年 / 248卷
基金：
中国国家自然科学基金;
关键词：
U(VI); Graphene oxide; Nano-alumina; XPS; Decontamination mechanism; EFFICIENT ENRICHMENT; ENHANCED ADSORPTION; OXIDE NANOSHEETS; BATCH; EXAFS; EU(III); RADIONUCLIDES; REMOVAL; SEQUESTRATION; SPECTROSCOPY;
D O I：
10.1016/j.envpol.2019.01.126
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
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.
引用
收藏
页码：332 / 338
页数：7
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