Rationally designed an azo colorimetric sensor with high selectivity and sensitivity for uranium environmental monitoring
Rationally designed an azo colorimetric sensor with high selectivity and sensitivity for uranium environmental monitoring
复制标题
合理设计高选择性、高灵敏度的偶氮比色传感器，用于铀环境监测
DOI：
10.1016/j.aca.2020.10.005
复制
发表时间：
2020
影响因子：
6.2
通讯作者：
Hongqing Wang
中科院分区：
文献类型：
--
作者：
Xumeng Wu;Qiang Yin;Qiuxiang Huang;Yu Mao;Qinghua Hu;Hongqing Wang
铀是一把双刃剑，既具有高效能源性，又具有放射性毒性，在吸引人们享受发电优势的同时，也因核素迁移带来潜在危害。因此，有必要开发一种高效的传感器来现场监测铀酰离子。然而，所报道的传感器的设计过程是随机的、耗时且困难的。寻找一种新的策略来合理、快速、有效地筛选出铀高效检测所需的分子是当务之急。在合理设计方法的指导下，以Egap为参数，对所设计的PADAP衍生物与铀酰配合物之间的色差进行了评价。优化后的结构传感器2-（（3-溴-5-（9，9-二辛基-7-（4，4，5，5-四甲基-1，3，2-二氧杂硼杂环戊烷-2-基）-9H-芴-2-基）-2-吡啶偶氮）-5-（二乙氨基）苯酚（abbr. W1 H），并成功地合成了该化合物。W1 H与铀酰离子结合后呈现明显的颜色变化（红变蓝），其对铀的检测限低至纳摩尔。更有意义的是，通过对电子云密度分布、Ebind、1HNMR、IR和MS的理论计算，首次阐明了W1 H与铀的配位机理。W1 H及其比色试纸条具有更优异的铀酰灵敏度、选择性和可回收性，已应用于铀尾矿周围环境样品中低浓度铀的检测，为实际样品中痕量铀的现场监测提供了一种有用的方法。
Uranium, a double-edged sword with high-efficiency energy and radioactive toxicity, attracts people to enjoy the advantages by generating power, but at the same time brings potential harm by nuclide migration. Therefore, it is necessary to develop a highly-efficient sensor to monitor uranyl ions in the field. However, the designed processes of the reported sensors are random, time-consuming and difficulty. It is urgent to find a new strategy to rationally, quickly and effectively screen out the required molecule for efficient uranium detection. Herein, with the guidance from the rational design method, the parameter, Egap, was applied to judge the chromatic aberration between the designed PADAP derivate and its uranyl complex. And the optimized structure sensor, 2-((3-bromo-5-(9,9-dioctyl-7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-fluoren-2-yl)-2-pyridylazo)-5-(diethylamino)phenol (abbr. W1H), was screened and successfully synthesized. W1H exhibited significant color change (red to blue) after binding uranyl ions, and its detection limit for uranium was as low as nanomolar. More meaningfully, the coordination mechanism of W1H toward uranium was clarified by theoretical calculation of the electron cloud density distribution, Ebind, and1H NMR, IR and MS for the first time. With the more excellent uranyl sensitivity, selectivity, and recyclability, W1H and its colorimetric test strip have been applied to the detection of low-concentration uranium in environmental samples around the uranium tailings, providing a useful on-site method to monitor trace uranium in actual samples.