Multifunctional fibrous silica composite with high optical sensing performance and effective removal ability toward Hg2+ ions

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

来源：Journal of Materials Chemistry B, 2015, 3(16): 3201-3210.

DOI：10.1039/c5tb00038f

• RHODAMINE-BASED CHEMOSENSORS
• ON FLUORESCENT SENSOR
• NAKED-EYE DETECTION
• SENSITIVE DETECTION
• AQUEOUS-SOLUTION
• METAL-IONS
• LABEL-FREE
• CU2+ IONS
• PROBE
• ADSORPTION

A multifunctional organic-inorganic hybrid sensing material (RB-KCC-1) was prepared by the immobilization of a rhodamine-based receptor (RB-Si) within the channels of fibrous silica spheres (KCC-1), and characterized by transmission electron microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, N-2 adsorption-desorption, and UV-vis absorption and fluorescence spectroscopy. This multifunctional sensor exhibits high surface area, large open pores and a flexible fibrous structure, and excellent optical sensing properties that allow for highly selective, sensitive and "naked eye" Hg2+ detection. The fluorescence enhancement responses of RB-KCC-1 are associated with the spirolactam ring opening of the rhodamine group, and a detection limit of 9.05 x 10(-7) M is obtained. In additional, it is also an excellent adsorbent for the removal of Hg2+ from aqueous solution. The adsorption process of Hg2+ on RB-KCC-1 is well described by the Langmuir isotherm equation, and the equilibrium adsorption capacity is 115.47 mg g(-1). These results indicate that these multifunctional composites may have good potential as favorable materials for the facile detection and effective removal of Hg2+ in biological, environmental, and industrial fields.

• 出版日期2015
• 单位兰州大学