Fluorescent and colorimetric magnetic microspheres as nanosensors for Hg2+ in aqueous solution prepared by a sol–gel grafting reaction and host–guest interaction

Abstract

Fluorescent sensing TSRh6G-β-cyclodextrin fluorophore/adamantane-modified inclusion complex magnetic nanoparticles (TFIC MNPs) have been synthesized via the cooperation of a host-guest interaction and sol-gel grafting reaction. Powder X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, and UV-visible absorption and emission spectroscopy have been employed to characterize the material. Fluorescence and UV-visible spectra have shown that the resultant multifunctional nanoparticle sensors exhibit selective 'turn-on' type fluorescent enhancements and a clear color change from light brown to pink with Hg(2+). Owing to a larger surface area and high permeability, TFIC MNPs exhibit remarkable selectivity and sensitivity for Hg(2+), and its detection limit measures up to the micromolar level in aqueous solution. Most importantly, magnetic measurements have shown that TFIC magnetic nanoparticles are superparamagnetic and they can be separated and collected easily using a commercial magnet. These results not only solve the limitations in practical sensing applications of nanosensors, but also enable the fabrication of other multifunctional nanostructure-based hybrid nanomaterials.

Effect of DksA Protein on the Susceptibility of Escherichia coli Towards Novel Amine N-Halamine Polymeric Nanoparticles as Powerful Antibiotics

“…Additionally, the C-N and N-Cl characteristic peak appeared at around 1230 and 750 cmG 1 , respectively . The multiplet of C-O-C stretching is detected within the range of 1070-1170 cmG 1 regarding to the ether bond from ATMP units in polymers (Wang et al, 2013b). The presence of C-N, C-O-C and N-Cl vibration can act as marker for the formation of the ATMP structural units in polymer chains.…”

Host–guest-recognition-based polymer brush-functionalized mesoporous silica nanoparticles loaded with conjugated polymers: A facile FRET-based ratiometric probe for Hg 2+

“…However, after forming the inclusion of adamantine in a β-CD cavity for PPV@MSN@PGMA@CD@ AD-SRhB after host-guest interactions, the probe can detect Hg 2+ from other interfering ions effectively. It has been reported that the metal ions such as Fe 3+ , Al 3+ and Hg 2+ can all induce ring-opening AD-SRhB [37][38][39] before the recognition between β-CD and AD-SRhB. In our work, Fe 3+ and Al 3+ hardly induce ring-opening AD-SRhB for the probe of PPV@MSN@PGMA@CD@ AD-SRhB after the host-guest recognition possibly due to the other stronger adsorption sites for Fe 3+ and Al 3+ presented in PPV@MSN@PGMA@CD nanoparticles.…”

“…Ai et al described a novel optical biosensor for amantadine determination based on fluorescence resonance energy transfer (FRET) [36]. Wang et al have designed and fabricated the magnetic nanoparticle-based chemosensors for the detection of Hg 2+ , in which the rhodamine-cyclodextrin fluorophore moiety is loaded on the adamantane-functionalized magnetic silica microspheres surface via host-guest interactions [37].…”

Simultaneous detection and removal of metal ions based on a chemosensor composed of a rhodamine derivative and cyclodextrin-modified magnetic nanoparticles

“…Therefore, a number of metal selective sensors have been developed based on rhodamine derivatives with different recognize groups [17,18]. Li [19] and Duan [20] groups synthesized chemosensors for Hg 2?…”

“…This property makes b-CD to form supramolecular inclusion complexes with size suitable and hydrophobic small molecules, for example, adamantyl (AD) [17,25], azobenzene [26], nitrobenzene [27], and so on [28].…”