Journal
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Volume 215, Issue 20, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.201700996
Keywords
dye adsorption; microwave-hydrothermal synthesis; WO3 nanorods
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2017R1D1A3A03000559]
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Nanostructures of WO3 powders are selected as a dye adsorbent and investigated to understand the effects of specific surface area of WO3 nanorods on dye-adsorption performance. The synthesis of WO3 nanorods is performed using microwave-assisted hydrothermal methods within 5min, with sodium tungstate dihydrate as a precursor and citric acid as a structure-directing agent. The as-synthesized WO3 nanorods are characterized by x-ray diffraction, transmission electron microscopy, scanning electron microscopy, Fourier transform infrared (FT-IR) spectroscopy, and Brunauer-Emmett-Teller (BET) measurements for their phases, structure, morphology, surface properties, and specific surface area, respectively. The dye-adsorption performance is studied with a methylene blue (MB) solution using UV-visible spectroscopy, and the results agreed well with the Langmuir model of adsorption. The maximum adsorption capacity of the WO3 nanorods was derived from Langmuir model's fitting. The specific surface area of WO3 powders synthesized at 150 degrees C is 52.05m(2)g(-1); it tended to decrease with increasing synthesis temperature because of the stacking of nanorods. As a result, the adsorption performance of the WO3 nanorods is improved as the overall specific surface area increased.
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