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本文报道了一种荧光分子修饰的亲水性Fe3O4@SiO2核壳纳米颗粒的制备方法,及其对Hg2+和Zn2+的荧光检测.首先,利用溶剂热方法,制备了亲水性的磁性Fe3O4纳米颗粒;然后,利用传统的溶胶凝胶法在Fe3O4纳米颗粒的表面包覆SiO2壳层,得到了Fe3O4@SiO2核壳纳米颗粒;最后,采用共价连接的方式,将8-氨基喹啉(8-AQ)的衍生物(QIOEt)与罗丹明6G(R6G)的衍生物(R6GOEt)修饰到Fe3O4@Si O2核壳纳米颗粒的表面,制备了R6G/8-AQ共同修饰的Fe3O4@SiO2核壳纳米颗粒.研究表明,该双通道荧光纳米颗粒在中性水溶液中对Hg2+和Zn2+有很好的检测选择性和灵敏性,对Zn2+和Hg2+的检测线性范围分别为3.3×10–9~3.96×10–8Μ和4.0×10–9~7.65×10–8Μ.该荧光纳米材料的制备方法简单,对Hg2+和Zn2+的灵敏度高、选择性好,且可重复利用,因此在环境检测领域有广泛的应用前景.
This paper reports the preparation of a fluorescent molecule-modified hydrophilic Fe3O4 @ SiO2 core-shell nanoparticles and their fluorescence detection of Hg2 + and Zn2 + .Firstly, the hydrophilic magnetic Fe3O4 nanoparticles were prepared by solvothermal method Then, the Fe3O4 @ SiO2 core-shell nanoparticles were obtained by coating the surface of Fe3O4 nanoparticles with the traditional sol-gel method. Finally, 8-aminoquinoline (8- AQ) and the derivative of rhodamine 6G (R6G) (R6GOEt) were modified onto the surface of Fe3O4 @ Si O2 core-shell nanoparticles to prepare R6G / 8-AQ co-modified Fe3O4 @ SiO2 core- The results showed that the dual-channel fluorescent nanoparticles had good selectivity and sensitivity for Hg2 + and Zn2 + in neutral aqueous solution, and the linear range of detection for Zn2 + and Hg2 + was 3.3 × 10-9 ~ 3.96 × 10 -8M and 4.0 × 10-9 ~ 7.65 × 10-8 M. The preparation method of the fluorescent nanomaterials is simple, has high sensitivity, good selectivity and reusability to Hg2 + and Zn2 +, and is therefore widely used in the field of environmental testing prospect.