Adsorption-Induced Crystallization of U-Rich Nanocrystals on Nano-Mg(OH)2 and the Aqueous Uranyl Enrichment

被引：51

作者：

Chen, Zhi ^{[1
,2
]}

Zhuang, Zanyong ^{[1
]}

Cao, Qing ^{[1
]}

Pan, Xiaohong ^{[1
,2
]}

Guan, Xiong ^{[2
]}

Lin, Zhang ^{[1
]}

机构：

[1] Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China

[2] Fujian Agr & Forestry Univ, Minist Educ, Key Lab Biopesticide & Chem Biol, Fuzhou 350002, Fujian, Peoples R China

来源：

ACS APPLIED MATERIALS & INTERFACES | 2014年 / 6卷 / 02期

基金：

美国国家科学基金会;

关键词：

nano-Mg(OH)(2); uranyl; adsorption; mechanism; crystallization; enrichment; FAST CRYSTAL-GROWTH; WASTE-WATER; CR-VI; NANOTUBES; HYDROXIDE; NANOWASTE; SORBENTS; URANIUM;

D O I：

10.1021/am405306j

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The mechanism of the interaction between nano-Mg(OH)(2) adsorbent and uranyl in water was studied. At trace levels, the uranyl is adsorbed as a monolayer on nano-Mg(OH)(2), and occupied a small proportion of the adsorption sites. As the uranyl concentration crosses over a threshold, continuous increase of adsorption capacity takes place. It indicates that, by taking the pre-adsorbed uranyl as the nucleation centers, the additional uranyl crystallizes and forms U-rich nanocrystals well-scattered on the surface of nano-Mg(OH)(2). A strategy of inducing fast crystal growth of nano-Mg(OH)(2) to micrometer-sized Na2Mg(CO3)(2) enables the desorption and enrichment of uranyl. The recycling and reuse of nano-Mg(OH)(2) can be achieved simultaneously. The finding in this work provides fundamental understanding of the efficient usage of nano-Mg(OH)(2) in practical applications.

引用

页码：1301 / 1305

页数：5

共 24 条

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