Multifunctional Fe3O4@SiO2 nanoparticles for selective detection and removal of Hg2+ ion in aqueous solution

作者：Sun, Zebin; Guo, Dan; Li, Haizhen; Zhang, Li; Yang, Bo; Yan, Shiqiang^*

来源：RSC Advances, 2015, 5(15): 11000-11008.

DOI：10.1039/c4ra13487g

• RHODAMINE-BASED FLUORESCENT
• MESOPOROUS SILICA
• COLORIMETRIC CHEMODOSIMETER
• PHYSIOLOGICAL CONDITIONS
• NATURAL-WATER
• LIVING CELLS
• SENSOR
• PROBE
• CU2+
• MERCURY

In the present work, a multifunctional magnetic core-shell Fe3O4@SiO2 nanoparticle decorated with a rhodamine-based receptor, which exhibits high selectivity and sensitivity toward Hg2+ over other metal ions in aqueous solution, has been synthesized by the graft method and characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, vibrating sample magnetometry, and UV-vis absorption and fluorescence spectra. The multifunctional nanoparticles show superparamagnetic behavior, clear core-shell architecture, and also exhibit high optical sensing performance for the detection of Hg2+. The fluorogenical responses of RB-Fe3O4@SiO2 are stable under a broad pH range. Additionally, these nanoparticles show high performance in the magnetic separability and effective removal of excess Hg2+ in water via an external magnetic field. These results indicate that these multifunctional magnetic nanoparticles may find potential and practical applications for selective detection and simple removal of Hg2+ in environmental, toxicological, and biological fields.

• 出版日期2015
• 单位兰州大学