3,4-Hydroxypyridinone-modified carbon quantum dot as a highly sensitive and selective fluorescent probe for the rapid detection of uranyl ions

Abstract

3,4-Hydroxypyridinone-modified carbon quantum dots were prepared via a post-modification approach by introducing a specific molecule into the CQD surface, and applied to the field of rapid detection of uranyl ions.

Regenerable and stable sp2 carbon-conjugated covalent organic frameworks for selective detection and extraction of uranium

“…However, their application for the detection or extraction of UO 2 2+ has not been explored. More importantly, the exploration of COFs for fluorescence detection of UO 2 2+ is still in its infancy, and most UO 2 2+ -sensing platforms are often hampered by poor selectivity and a long response time [37][38][39][40] .…”

“…2a). A strong peak at 5.8°(2θ) is assigned to the diffraction from the (100) plane, indicating a highly crystalline of TFPT-BTAN 37 . The other peaks at 9.8°, 11.2°, and 26.3°(2θ) are assigned to the diffractions of (110), (200), and (001) planes, respectively.…”

A novel synthesis of graphene quantum dots via thermal treatment of crude graphite oxide in a dry and alkaline condition, and their application in uranyl detection

“…The UV-Vis spectrum of 0.05 mg mL −1 aGQD solution is shown in Figure 3 a. A shoulder absorption peak at 260 nm is observed which is ascribed to the π–π∗ transition of aromatic sp 2 domains, similar to chemically reduced GO [ 35 , 45 ]. Another weak shoulder peak in the region of about 300 nm should be related to the n–π∗ transition [ 38 ].…”

“…Especially, due to the CQDs' rich oxygen-containing groups or other functional groups decorated via modification, they show strong interaction with certain metal cations even at ultra-low concentrations, followed by significant and visible fluorescence quenching effect [ 18 , 31 , 32 , 33 , 34 ]. In other words, it is a promising fluorescent chemosensor material for facile and rapid uranyl detection [ 35 , 36 ]. Generally, synthesis routes of CQDs could be classified into two main kinds: top-down and bottom-up process.…”

Ultrasensitive detection of UO22+ based on dopamine‐functionalized MoOx quantum dots

“…In recent years, various nanomaterials have been applied for uranium detection due to their excellent optical/electronic properties; these include gold nanoparticles, [ 7,8,19 ] semiconductor quantum dots, [ 9,20,21 ] metal–organic frameworks, [ 22,23 ] polydopamine nanoparticles, [ 24 ] and carbon nanomaterials. [ 25,26 ] However, some shortcomings still exist, such as tedious probe preparation, expensive materials, and low sensitivity.…”