Abstract
Pollution caused by copper is one of the key factors of environment contamination. As one of the heavy metals, copper is hard to decompose in nature; the biological enrichment of which may lead to severe damage to health. Cu2+ detection, thus, possesses a bright application prospect both in environment protection and in human health. In this paper, a dual-functional fluorescence-magnetic composite nanoplatform has been designed to sensitively detect, meanwhile, capture, and remove Cu2+ in the solution of water and ethanol (1 : 1, v/v). The core-shell structure nanoparticle synthesized by using Fe3O4 as core and SiO2 as shell is covalently bonded with rhodamine derivatives on the silica layer to construct the nanoplatform. The emission is increased upon the addition of Cu2+, showing fluorescence turn on effect for the detection, and the limit of detection is as low as 1.68 nM. Meanwhile, Cu2+ ions are captured by the coordination with rhodamine derivatives and can be removed with the help of magnetic field.
Highlights
With the increasing development of social productivity, copper pollution as a representative of heavy metal contamination is getting worse
Copper is hard to decompose in nature, and the resulting enrichment through food chain may lead to severe damage to health [4, 5]
The rhodamine derivative (P for short) was synthesized according to our previous article [37]. 60 mg of Fe3O4@SiO2 nanoparticles was redispersed in 20 mL of toluene, and the solution was heated to 80°C. 20 μL of (3-isocyanatopropyl)triethoxysilane was added by drops, and the temperature was kept at 110°C for
Summary
With the increasing development of social productivity, copper pollution as a representative of heavy metal contamination is getting worse. The development of new methods for the detection and removal of copper ions in the environment has attracted a lot of research interests in the past decades. Lots of fluorescent probes have been developed for detection of Cu2+ ions with high sensitivity and selectivity [24,25,26]. Scheme 1: Schematic illustration of the synthetic procedure of the Fe3O4@SiO2@P and the proposed sensing and removal mechanism of Fe3O4@SiO2@P towards Cu2+ ions Among these reports, rhodamine compounds have shown significant advantages over some traditional fluorophores due to their attractive feature such as high photostability, wide wavelength range, and high fluorescence quantum yield and become an extensive research topic in the field of chemistry and biology [27,28,29,30].
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