Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng, 224051, PR China.
School of Chemistry and Chemical Engineering & Center for Atomic Engineering of Advanced Materials & AnHui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Anhui University, Hefei, 230601, PR China.
J Hazard Mater. 2021 Feb 5;403:123698. doi: 10.1016/j.jhazmat.2020.123698. Epub 2020 Aug 14.
Fabrication of metal-organic frameworks (MOFs) based multifunctional sensors for various environmental pollutants represents a promising solution to the development of novel monitoring technologies. In this work, a dual responsive sensor of UiO-66-MA has been efficiently fabricated via post-modification of the UiO-66-MOF with maleic anhydride (MA), and dual detection of HS and Cu in aquatic environments has been achieved tandemly. UiO-66-MA could selectively undergo Michael addition with HS accompanying a linear fluorescence turn-on behavior. The sensing is highly sensitive and selective, and the detection limit value of 3.3 nM represents the lowest record among all MOF-based HS sensing researches. Moreover, an alternative sensor for Cu could be further tandemly afforded after the HS sensing. The HS added product of UiO-66-MA/HS exhibits selective fluorescence quenching towards Cu with a detection limit as low as 2.6 nM. UiO-66-MA exhibits dual sensing functions for HS and Cu following a tandem process based on combinatorial principles of Michael addition and S-Cu coordination. Evaluation studies suggest the promising potentials of UiO-66-MA in determining the level of HS and Cu in aquatic environment, and the tandemly derived dual sensing functions demonstrate the advantages of developing multifunctional MOF sensors based on combinatorial principles.
基于金属有机框架（MOFs）的多功能传感器用于各种环境污染物的制备代表了开发新型监测技术的有前途的解决方案。在这项工作中，通过马来酸酐（MA）对 UiO-66-MOF 进行后修饰，有效地制备了UiO-66-MA 的双响应传感器，并串联地实现了对 HS 和 Cu 在水环境中的双重检测。UiO-66-MA 可以与 HS 进行迈克尔加成反应，伴随线性荧光开启行为。该传感具有高灵敏度和选择性，检测限为 3.3 nM，是所有基于 MOF 的 HS 传感研究中的最低记录。此外，在 HS 传感之后，可以进一步串联提供用于 Cu 的替代传感器。UiO-66-MA/HS 的 HS 添加产物对 Cu 表现出选择性荧光猝灭，检测限低至 2.6 nM。UiO-66-MA 基于迈克尔加成和 S-Cu 配位的组合原理，通过串联过程表现出对 HS 和 Cu 的双重传感功能。评估研究表明，UiO-66-MA 在确定水环境污染中 HS 和 Cu 的水平方面具有很大的潜力，而串联衍生的双重传感功能证明了基于组合原理开发多功能 MOF 传感器的优势。
