Novel electroblowing synthesis of submicron zirconium dioxide fibers : effect of fiber structure on antimony(v) adsorption
Paajanen, Johanna; Lönnrot, Satu; Heikkilä, Mikko; Meinander, Kristoffer; Kemell, Marianna; Hatanpää, Timo; Ainassaari, Kaisu; Ritala, Mikko; Koivula, Risto (2019-10-18)
NanoscaleAdv.,2019,1,4373, https://doi.org/10.1039/c9na00414a
This journal is © The Royal Society of Chemistry 2019. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.
https://creativecommons.org/licenses/by-nc/3.0/
https://urn.fi/URN:NBN:fi-fe2020042422371
Tiivistelmä
Abstract
Both stable and radioactive antimony are common industrial pollutants. For antimonate (Sb(V)) removal from industrial waste water, we synthesized submicron zirconium dioxide (ZrO₂) fibers by electroblowing and calcination of the as-electroblown fibers. The fibers are amorphous after calcination at 300 and 400 °C and their average diameter is 720 nm. The fibers calcined at 500 to 800 °C have an average diameter of 570 nm and their crystal structure transforms from tetragonal to monoclinic at the highest calcination temperatures. We investigated Sb(V) adsorption capacity of the synthesized ZrO₂ fibers as a function of pH, adsorption isotherm at pH 6 and adsorption kinetics at pH 7. The tetragonal ZrO₂ fibers calcined at 500 °C exhibited the best potential for Sb(V) remediation with Sb(V) uptake of 10 mg g⁻¹ at pH 2 and a maximum Sb(V) uptake of 8.6 mg g⁻¹ in the adsorption isotherm experiment. They also reached 30% of 7 days’ Sb(V) uptake in only a minute. The adsorption kinetics followed the Elovich model.
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