Adsorption of uranium(VI) from aqueous solution using phosphonic acid-functionalized silica magnetic microspheres

被引：16
|
作者：
Zhou, Limin [1 ]
Zou, Hongbin [1 ]
Wang, Yun [1 ]
Liu, Zhirong [1 ]
Huang, Zhiwei [1 ]
Luo, Taian [1 ]
Adesina, Adesoji A. [2 ]
机构：
[1] East China Univ Technol, State Key Lab Nucl Resources & Environm, 418 Guanglan Rd, Nanchang 330013, Peoples R China
[2] Univ New South Wales, Sch Chem Sci & Engn, Sydney, NSW 2035, Australia
来源：
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY | 2016年 / 310卷 / 03期
关键词：
Silica; Phosphonic acid; Magnetic adsorption; U(VI); TRIETHYLENE-TETRAMINE; WATER SAMPLES; SCHIFF-BASE; REMOVAL; EXTRACTION; PRECONCENTRATION; CHITOSAN; U(VI); IONS; NANOPARTICLES;
D O I：
10.1007/s10967-016-4878-2
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
The phosphonic acid-functionalized silica magnetic microspheres (PA-SMM) were successfully synthesized for U(VI) adsorption. The PA-SMM exhibited higher adsorption capacity for U(VI) compared to unmodified silica magnetic microspheres due to the high affinity of phosphonic acid groups with U(VI). The adsorption was dominated by inner sphere surface chelation and kinetically followed the pseudo-second-order equation. The adsorption isotherms fitted well to the Langmuir model, with the maximum adsorption capacity of 76.9 mg/g at 298 K and pH 5.0. Thermodynamic parameters indicated the endothermic and spontaneous nature of U(VI) adsorption. The PA-SMM could be regenerated using 0.2 M EDTA-0.5 M HNO3 as the eluent.
引用
收藏
页码：1155 / 1163
页数：9
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