Low Band Gap Benzoxazole-Linked Covalent Organic Frameworks for Photo-Enhanced Targeted Uranium Recovery

被引：124

作者：

Cui, Wei-Rong ^{[1
]}

Zhang, Cheng-Rong ^{[1
]}

Xu, Rui-Han ^{[1
]}

Chen, Xiao-Rong ^{[1
]}

Yan, Run-Han ^{[1
]}

Jiang, Wei ^{[1
]}

Liang, Ru-Ping ^{[1
]}

Qiu, Jian-Ding ^{[1
]}

机构：

[1] Nanchang Univ, Coll Chem, Nanchang 330031, Jiangxi, Peoples R China

来源：

SMALL | 2021年 / 17卷 / 06期

基金：

中国国家自然科学基金;

关键词：

chemical reduction; covalent organic frameworks; photocatalytic; photothermal; uranium recovery; EXTRACTION; EFFICIENT;

D O I：

10.1002/smll.202006882

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The inherent features of covalent organic frameworks (COFs) make them highly attractive for uranium recovery applications. A key aspect yet to be explored is how to improve the selectivity and efficiency of COFs for recovering uranium from seawater. To achieve this goal, a series of robust and hydrophilic benzoxazole-based COFs is developed (denoted as Tp-DBD, Bd-DBD, and Hb-DBD) as efficient adsorbents for photo-enhanced targeted uranium recovery. Benefiting from the hydroxyl groups and the formation of benzoxazole rings, the hydrophilic Tp-DBD shows outstanding stability and chemical reduction properties. Meanwhile, the synergistic effect of the hydroxyl groups and the benzoxazole rings in the pi-conjugated frameworks significantly decrease the optical band gap, and improve the affinity and capacity to uranium recovery. In seawater, the adsorption capacity of uranium is 19.2x that of vanadium, a main interfering metal in uranium extraction.

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页数：11

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