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VO2(D) hollow core–shell microspheres: synthesis, methylene blue dye adsorption and their transformation into C/VOx nanoparticles

Zhang, L., Yao, J., Xia, F., Guo, Y., Cao, C., Chen, Z., Gao, Y. and Luo, H. (2018) VO2(D) hollow core–shell microspheres: synthesis, methylene blue dye adsorption and their transformation into C/VOx nanoparticles. Inorganic Chemistry Frontiers, 5 (3). pp. 550-558.

Link to Published Version: https://doi.org/10.1039/c7qi00819h
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Abstract

In this work, we report the fabrication of novel VO2(D) hollow core–shell microspheres (VO2(D)-HCSMs) via a facile hydrothermal method. Microscopic examination revealed that the VO2(D)-HCSMs consisted of numerous nanocrystals and had an average size of 1–10 μm and a shell thickness of 300 nm. An inside-out Ostwald ripening process was responsible for the formation of the VO2(D)-HCSMs. Meanwhile, citric acid played dual roles, acting as a reductant for reducing vanadium pentoxide and as a morphology directing agent for producing core–shell microspheres. The resulting VO2(D)-HCSMs exhibited excellent adsorption performance with a maximum adsorption capacity of 97.5 mg g−1 for methylene blue (MB). The C/VOx particles were generated by the calcination of the VO2(D)-HCSMs with adsorbed MB dye at 250 °C in air for 4 h, and the microspheres showed enhanced adsorption capacity and good reusability (over 99% MB removal after four cycles) because of the existence of amorphous carbon nanowires, making them a potential adsorbent for removing organic dyes from wastewater.

Publication Type: Journal Article
Murdoch Affiliation: School of Engineering and Information Technology
Publisher: Royal Society of Chemistry
Copyright: © 2018 Royal Society of Chemistry
URI: http://researchrepository.murdoch.edu.au/id/eprint/40541
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