Shape-Controlled Catalytic ZIF-67 Micromotors for Dye Adsorption
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JMEPEG https://doi.org/10.1007/s11665-020-05091-3
Shape-Controlled Catalytic ZIF-67 Micromotors for Dye Adsorption Huijun Chen, Hongli Zhu, Jing Huang, and Xiaomiao Feng (Submitted July 1, 2020; in revised form July 26, 2020) Spheroidal and dodecahedron metal–organic frameworks (MOFs)-based catalytic micromotors were synthesized by one-step method through changing the solvent. The morphology and composition of the final products were characterized by scanning electronic microscope, Fourier-transform infrared spectra, transmission electron microscope and X-ray diffraction. The dodecahedron micromotors exhibit eximious performance that they can move autonomously in 10% hydrogen peroxide with a speed of 61.39 lm s21. Moreover, the micromotors show a long movement life of 90 min. Owing to the special character of MOFs, the micromotors can dramatically adsorb the organic pollutants within 5 min. The spheroidal micromotor shows better adsorption efficiency for its higher surface area, which benefits from its hollow structure. Keywords
dye adsorption, micromotor, MOF, self-propelled
1. Introduction In 2002, the Whitesides group first designed a smart machine (Ref 1), which could transform chemical energy into kinetic energy. Since then, micromotors have been attracting wide attention from researchers all over the world, owing to their autonomous motion in micro/nanoscale (Ref 2-4). Outstanding achievements have been made in a variety of applications of micromotors in biological and environment fields including cargo transportation (Ref 5), cell separation (Ref 6), biosensing (Ref 7), targeted delivery (Ref 8) and water cleaning (Ref 9). As far as water cleaning, there are many approaches as follows: chemical flocculation (Ref 10), oxidation (Ref 11), electrochemical degradation (Ref 12), adsorption (Ref 13) and photolysis (Ref 14). For the adsorption method, the adsorbent is usually including active carbon (Ref 15), molecular sieve (Ref 16), modified diatomite (Ref 17), silica gel (Ref 18) and so on. Compared with the static adsorption method, micromotors can provide a kind of dynamic adsorption, which has fast and efficient adsorption efficiency. For example, Maria Guix (Ref 19) described a kind of superhydrophobic alkanethiol-coated microsubmarines to remove the oil in seawater. It relies on the outer hydrophobic layer to complete the adsorption of oil. After that, Lluis Soler (Ref 20) reported a Fe/Pt catalytically microjets used for the degradation of rhodamine 6G that was owing to the outer
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11665-020-05091-3) contains supplementary material, which is available to authorized users. Huijun Chen, Hongli Zhu, Jing Huang, and Xiaomiao Feng, Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210023, China. Contact e-mail: iamxmf
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