Issue 3, 2018

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

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.

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

Supplementary files

Article information

Article type
Research Article
Submitted
26 Dec 2017
Accepted
01 Feb 2018
First published
01 Feb 2018

Inorg. Chem. Front., 2018,5, 550-558

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

L. Zhang, J. Yao, F. Xia, Y. Guo, C. Cao, Z. Chen, Y. Gao and H. Luo, Inorg. Chem. Front., 2018, 5, 550 DOI: 10.1039/C7QI00819H

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