Interfacially Super-Assembled Asymmetric and H2O2 Sensitive Multilayer-Sandwich Magnetic Mesoporous Silica Nanomotors for Detecting and Removing Heavy Metal Ions |
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Authors: | Beilei Qiu Lei Xie Jie Zeng Tianyi Liu Miao Yan Shan Zhou Qirui Liang Jinyao Tang Kang Liang Biao Kong |
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Affiliation: | 1. Department of Chemistry, Shanghai Key Lab of Molecular Catalysis and Innovative Materials and Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai, 200438 P. R. China;2. Department of Chemistry, The University of Hong Kong, Hong Kong, 999077 China;3. School of Chemical Engineering and Graduate School of Biomedical Engineering, The University of New South Wales, Sydney, New South Wales, 2052 Australia |
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Abstract: | Asymmetric hollow and magnetic mesoporous silica nanocomposites have great potential applications due to their unique structural–functional properties. Here, asymmetric multilayer-sandwich magnetic mesoporous silica nanobottles (MMSNBs) are presented through an interfacial super-assembly strategy. Asymmetric hollow silica nanobottles (SNBs) are first prepared, and Fe3O4 nanoparticles monolayers and mesoporous silica layers are uniformly super-assembled on the surfaces of SNBs, respectively. The high Fe3O4 nanoparticles loading endows MMSNBs with a high magnetization (8.5 emu g?1), while the mesoporous silica layers exhibit high surface area (613.4 m2 g?1) and large pore size (3.6 nm). MMSNBs can be employed as a novel type of enzyme-powered nanomotors by integrating catalase (Cat-MMSNBs), which show an average speed of 7.59 µm s?1 (≈25 body lengths s?1) at 1.5 wt% H2O2. Accordingly, the water quality can be monitored by evaluating the movement speed of Cat-MMSNBs. Moreover, MMSNBs act as a good adsorbent for removing more than 90% of the heavy metal ions with the advantage of the mesoporous structure. In addition, the good magnetic response enables the MMSNBs with precise directional control and is conducive to recycling for repeated operation. This bottom-up interfacial super-assembly construction strategy allows for a new understanding of the rational design and synthesis of multi-functional nanomotors. |
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Keywords: | asymmetric heavy metal ions magnetic mesoporous nanomotors silica nanobottles super-assembly |
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