Luminescent magnetic nanoparticles encapsulated in MOFs for highly selective and sensitive detection of ClO−/SCN− and anti-counterfeiting. Issue 18 (27th April 2018)

• Record Type: Journal Article
• Authors: Li, Chaorui; Hai, Jun; Li, Siliang; Wang, Baodui; Yang, Zhengyin
• Is Part Of: Nanoscale. Volume 10:Issue 18(2018)
• Page Start: 8667
• Page End: 8676
• Publication Date: 2018-04-27
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c8nr01487f
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Luminous Eu(iii ) complex-functionalized Fe3 O4 nanoparticles encapsulated into zeolitic imidazolate framework materials (nano-ZIF-8) were prepared and employed as a fluorescent probe for detecting ClO − and SCN − with good selectivity and high sensitivity in ultra-pure water. Abstract : It is well-known that ClO − and SCN − can cause adverse effects on the environment and organisms; therefore, development of new strategies for detecting ClO − and SCN −, especially in water, are highly desirable. Here, we present luminous Eu(iii ) complex-functionalized Fe3 O4 nanoparticles encapsulated into zeolitic imidazolate framework materials (nano-ZIF-8) and successfully employ this nano-MOF as a fluorescence probe for selective and sensitive detection of ClO − and SCN − . The introduction of ClO − into nano-ZIF-8 solution induced a significant decrease in the characteristic fluorescence emission of Eu 3+ at 613 nm. However, strong fluorescence emission was again observed when SCN − was successively injected into the prepared nano-ZIF-8-ClO − . Thus, a novel fluorescence system for simultaneous detection of free ClO − and SCN − was established. On the basis of the superior adsorption performance of nano-MOF materials, free residual ClO − and SCN − in water was rapidly, sensitively and selectively detected with a detection limit of 0.133 nM and 0.204 nM, respectively. Moreover, nano-ZIF-8 was successfully used for monitoring the concentration levels of ClO − and SCN − in specimens of tap water and Yellow River water. Furthermore, the reversibility and regeneration of nano-ZIF-8 in sensing ClO − and SCN − is advantageous for applications of nano-ZIF-8 in solid-state sensing and anti-counterfeiting. As far as we know, this is the first time that nano-MOFs have been used as a selective fluorescence probe for ClO − /SCN − detection and anti-counterfeiting.