Capturing of Nano-TiO2 from Complex Mixtures by Bisphosphonate-Functionalized Fe3O4 Nanoparticles

详细信息    查看全文

• 作者：Ling-Feng Shen ; Yi-Zhou Zhu ; Peng-Fei Zhang ; He-Fang Wang
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2017
• 出版时间：February 6, 2017
• 年：2017
• 卷：5
• 期：2
• 页码：1704-1710
• 全文大小：398K
• ISSN：2168-0485

文摘

Selectively capturing nanosized titanium dioxide (nano-TiO₂) from complex mixtures is a very significant but very formidable task both for enriching the analytical methodology and removing/recycling of nano-TiO₂. We presented a novel sustainable strategy for such a task by using the bisphosphonate-functionalized Fe₃O₄ (BP-Fe₃O₄) nanoparticles as the highly selective adsorbents toward nano-TiO₂. The BP-Fe₃O₄ exhibited high equilibrium adsorption capacity (Q_e) toward nano-TiO₂ (2.45 g g^–1 for 60 nm anatase TiO₂) but negligible Q_e toward nano-SiO₂ (0.01 g g^–1 for 15 nm SiO₂). The BP-Fe₃O₄ also had good adsorption capability toward nano-TiO₂ in complex liquid media, or in the solid mixtures containing 10−500 times of coexisting nano-SiO₂. This capturing strategy enables the green pretreatment for quantitative analysis of nano-TiO₂ in complex real samples with the spike recoveries of 69.9–99.0% and low detection limit of 0.02 ppm. Furthermore, this strategy offers great convenience for identification of the crystal forms and even the morphology of nano-TiO₂ existing in complex real samples. Besides, this capturing strategy holds great potential for separating or removing nano-TiO₂ from the environment and the sustainable recycling of nano-TiO₂.