Abstract
Fe3O4@SiO2 nanospheres with a core–shell structure were synthesized and functionalized with bis(2-pyridylmethyl)amine (BPMA). The photoresponses of the as-obtained Fe3O4@SiO2-BPMA for Cr3+, Cd2+, Hg2+ and Pb2+ ions were evaluated through irradiation with a 352 nm ultraviolet lamp, and Fe3O4@SiO2-BPMA exhibited remarkable fluorescence enhancement toward the Cd2+ ion. The adsorption experiments revealed that Fe3O4@SiO2-BPMA had rapid and effective adsorption toward the Cd2+ ion. The adsorption reaction was mostly complete within 30 min, the adsorption efficiency reached 99.3%, and the saturated adsorption amount was 342.5 mg/g based on Langmuir linear fitting. Moreover, Fe3O4@SiO2-BPMA displayed superparamagnetic properties with the saturated magnetization of 20.1 emu/g, and its strong magnetic sensitivity made separation simple and feasible. Our efforts in this work provide a potential magnetic functionalized nanosensor for naked-eye identification and adsorption toward the Cd2+ ion.
Highlights
Cadmium (Cd) is an important rare element, which is widely used in the production of pigments [1], phosphors [2] and photocells [3]
We developed an inorganic/organic hybrid nanosensor for Cd2+ detection, in which the core–shell Fe3 O4 @SiO2 nanospheres were employed as a matrix, and bis(2-pyridylmethyl)amine (BPMA) was grafted onto the end of the Fe3 O4 @SiO2 surface through the “grafting from” method
A sensitive fluorescence sensor based on functionalized Fe3 O4 @SiO2 nanospheres was used for simultaneously detecting and removing Cd2+ ions
Summary
Cadmium (Cd) is an important rare element, which is widely used in the production of pigments [1], phosphors [2] and photocells [3]. High selectivity, instantaneous response and simplicity are the greatest advantages of these probe molecules [7,8,9,10] These chemosensors for Cd2+ are meant to be disposable and for single use only, and they are difficult if not impossible to recycle. The particles with nano size possess abundant surface active sites for surface modification, and the greatest strength of Fe3 O4 @SiO2 nanoparticles is their targeting ability These magnetic particles can be attracted to a target zone under the action of an external magnetic field, which makes recovery feasible [15,16,17,18,19,20,21]. It is worth noting that Fe3 O4 @SiO2 -BPMA possesses superparamagnetism, and the strong magnetic sensitivity makes recycling easier
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