Yongfeng Liu,Jiangtao Zhang,Xiaojun Du,Yang Cao,Youyi Sun
Here, the Ag nanoparticles decorated graphene (AgNP@GNs) were fabricated by combing liquid phase exfoliation with in-situ solvent reduction method. Furthermore, the electrochemical sensitivity toward Cd 2+ and Pb 2+ ions was also investigated in detail. This AgNP@GNs presented the excellent electrical properties (2.5×10 4 S/m), meanwhile showed high electrochemical detection ability toward Cd 2+ and Pb 2+ . The sensitivity of AgNP@GNs toward Pb 2+ and Cd 2+ was ca. 15.2μA/μM (or 1246.4μA/μg L -1 ) and 0.09μA/μM (4.32μA/μg L -1 ), respectively. The AgNP@GNs was also evaluated to electrochemical detection of Cd 2+ and Pb 2+ in real water, in which the recoveries (96~124%) were obtained. The work does not only provide a facile method to synthesize AgNP@GNs with good dispersion, but also showed good electrical properties for various applications.
In this paper, a magnetic nano-Fe 3 O 4 /triethanolamine/GO composite (TEA-GO-FE) was prepared by using graphene oxide (GO), triethanolamine (TEA), and ferric chloride. The result indicates that triethanolamine acted as an important role for the growing of Fe 3 O 4 and adsorption ability of composite material. The synthesis mechanism of TEA-GO-FE was investigated through the medium of SEM-EDS, XRD, FT-IR, and TEM. The characterization results indicated Fe 3 O 4 nanoparticles have been successfully loaded on the surface of graphene oxide and they were encapsulated by TEA and have excellent stability. According to the results of XRD, the general particle size of Fe 3 O 4 on TEA-GO-FE was 27.5 nm. In order to understand the adsorption properties of TEA-GO-FE for Pb 2+ and Cu 2+ , this article uses a static adsorption study method. The optimized adsorption conditions are as follows: pH = 5.0, temperature is 293.15 K, and the ion concentration is 100 mg/L. Under the optimized prerequisites, the adsorption capacities of Pb 2+ and Cu 2+ were 121.5 mg/g and 68.7 mg/g, separately. Through thermodynamic as well as kinetic studies, the adsorption process of Pb 2+ and Cu 2+ on TEA-GO-FE is a self-heating process.
Application of amino-functionalized mesoporous silica-coated core-shell magnetic nanoparticles (Fe3O4@mSiO2-NH2 NPs) for adsorbing heavy metal ions has attracted intensive interest in recent years. Despite the cytotoxicity triggered by the co-exposure of nanoparticles (NPs) and metal ions in relatively high dosages being reported, the effect of the adsorbed heavy metal ions on the cytotoxicity to human cells remains unexplored. Herein, we demonstrated the effect of amino-functionalized Fe3O4@mSiO2 core-shell magnetic nanoparticles before and after adsorbing Pb2+ ions on the cytotoxicity of human kidney cells (HEK293). The surface morphology, viability, and oxidative stress (OS) induction of HEK293 cells incubated with Fe3O4@mSiO2-NH2 NPs and Pb2+ ion-adsorbed Fe3O4@mSiO2-NH2 NPs were assessed, respectively. Transmission electron microscopic (TEM) images of cell sections depicted that Fe3O4@mSiO2-NH2 NPs were internalized by HEK293 cells and gathered mainly in the cytoplasm. Cell viability (MTT) assays revealed the Fe3O4@mSiO2-NH2 NPs could enhance the cell viability to 119.9% and 108.2% compared to the control group, respectively. On contrast, the Pb2+ ion-adsorbed Fe3O4@mSiO2-NH2 NPs were toxic to the cell because when the Pb2+ ion contents were 5.0 and 7.5 μg mL−1, the viabilities of the samples decreased to 97.1% and 84.7%, respectively. Oxidative stress data proved that OS was negatively affected by both dissociative Pb2+ ions and the Pb2+ ion-adsorbed Fe3O4@mSiO2-NH2 NPs. Cytotoxicity may be attributed to the OS induced by Pb2+ ions leaked from the adsorbent. Under the same Pb2+ ion concentration, the cytotoxicity of the adsorbed Pb2+ ions was lower than that of the dissociative Pb2+ ions, indicating that the adsorption by NPs inhibited the cytotoxicity of Pb2+ ions. This work will provide new references for assessing the cytotoxicity of Pb2+-adsorbed nanoparticles.
危险品化学品经营许可证（带存储）