Simultaneous sensitive detection and rapid adsorption of UO22+ based on a post-modified sp2 carbon-conjugated covalent organic framework,Environmental Science: Nano

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Simultaneous sensitive detection and rapid adsorption of UO22+ based on a post-modified sp2 carbon-conjugated covalent organic framework
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020/02/04 , DOI: 10.1039/c9en01225g
Cheng-Rong Zhang _{1,

2,

3,

4} , Wei-Rong Cui _{1,

2,

3,

4} , Wei Jiang _{1,

2,

3,

4} , Fang-Fang Li _{1,

2,

3,

4} , Yi-Di Wu _{1,

2,

3,

4} , Ru-Ping Liang _{1,

2,

3,

4} , Jian-Ding Qiu _{1,

2,

3,

4,

5}

Affiliation

As one of the most important elements in the nuclear industry, uranium has both radioactivity and chemical toxicity, which can harm human beings when released into the natural environment. It is difficult for most uranium adsorbents to maintain good stability under strong radiation and acid conditions. Therefore, it is highly desirable to develop a stable adsorbent for the rapid detection and efficient removal of uranium. Herein, we first constructed an amidoxime-functionalized luminescent sp² carbon linked covalent organic framework (TP-COF-AO), which is rich in amidoxime groups, has open 1D channels and an extraordinarily stable framework. Based on these advantages, it can reduce UO₂²⁺ from 9.25 ppm to below 10 ppb within 10 min and has a high adsorption capacity (436 mg g⁻¹). Meanwhile, the adsorption of UO₂²⁺ on TP-COF-AO results in rapid fluorescence quenching (within 2 s) with an ultra-low detection limit (8.3 nM), which is well below the maximum contamination standard in drinking water prescribed by the U.S. Environmental Protection Agency (130 nM). Moreover, it also has excellent recyclability that provides possibility for practical applications. This study indicates that the sp² carbon-conjugated COF can be used for the simultaneous detection and adsorption of UO₂²⁺ with good application prospects in environmental applications.

中文翻译：

基于修饰后的sp2碳共轭共价有机框架同时检测和快速吸附UO22 +

铀是核工业中最重要的元素之一，具有放射性和化学毒性，当释放到自然环境中时会对人体造成伤害。大多数铀吸附剂在强辐射和强酸条件下很难保持良好的稳定性。因此，非常需要开发一种稳定的吸附剂，用于快速检测和有效去除铀。在本文中，我们首先构建了一个富含mid胺肟基团，开放的一维通道和一个非常稳定的framework胺肟官能化的发光sp ²碳连接的共价有机骨架（TP-COF-AO）。基于这些优点，它可以减少UO ₂²⁺在10分钟内从9.25 ppm降至10 ppb以下，并具有高吸附容量（436 mg g ^-1）。同时，UO ₂²⁺在TP-COF-AO上的吸附导致荧光猝灭（在2 s内），检测限极低（8.3 nM），远低于饮用水规定的最大污染标准。美国环境保护署（130 nM）。此外，它还具有出色的可回收性，为实际应用提供了可能性。这项研究表明，sp ²碳共轭COF可用于同时检测和吸附UO ₂²⁺，在环境应用中具有良好的应用前景。

更新日期：2020-03-21

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