Efficient defluoridation of water by Monetite nanorods

Junjie Shen, Marina Franchi Evangelista, Godfrey Mkongo, Haibao Wen, Richard Langford, Georgina Margaret Rosair, Martin R. S. McCoustra, Valeria Arrighi

Research output: Contribution to journalArticle

Abstract

Novel Monetite nanorods were successfully prepared for fluoride removal for the first time. The fluoride adsorption on the Monetite nanorods was studied by the batch adsorption technique. The Monetite nanorods were characterized by transmission electron microscope (TEM), X-ray powder diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), and the point of zero charge (pHPZC) measurement. The results revealed that the Monetite nanorods transformed to fluorapatite after adsorbing fluoride. The adsorption kinetics followed the pseudo-second-order model, and the adsorption isotherms could
be well described by the Sips model. The maximum adsorption capacity was 222.88 mg g−1 at pH 7, 328 K when the initial fluoride concentration was 300 mg L−1 and the Monetite dose was 1 g L−1. The thermodynamic parameters revealed that the adsorption of fluoride onto Monetite nanorods was spontaneous and endothermic. The effects of different parameters including adsorbent dosage, pH, initial fluoride concentration and co-existing anions were investigated to understand the adsorption behaviour of Monetite nanorods under various conditions. Their adsorption capacities decreased with the increase of adsorbent dosage, and also decreased with the increase of pH. Electrostatic attraction and ion exchange were found to be the major mechanisms governing the adsorption of fluoride onto Monetite nanorods. Furthermore, a field study was conducted with the water from a fluoride endemic area in Tanzania. This study demonstrated that the synthesized Monetite nanorods were very effective adsorbents for defluoridation applications.
LanguageEnglish
Pages135-145
Number of pages11
JournalAdsorption
Volume24
Issue number2
Early online date11 Dec 2017
DOIs
Publication statusPublished - Feb 2018

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Nanorods
Fluorides
Water
Adsorption
Adsorbents
anhydrous dibasic calcium phosphate
Adsorption isotherms
X ray powder diffraction
Anions
Electrostatics
Infrared spectroscopy
Ion exchange
Electron microscopes
Thermodynamics
Kinetics

Cite this

Shen, J., Evangelista, M. F., Mkongo, G., Wen, H., Langford, R., Rosair, G. M., ... Arrighi, V. (2018). Efficient defluoridation of water by Monetite nanorods. Adsorption, 24(2), 135-145. https://doi.org/10.1007/s10450-017-9928-8
Shen, Junjie ; Evangelista, Marina Franchi ; Mkongo, Godfrey ; Wen, Haibao ; Langford, Richard ; Rosair, Georgina Margaret ; McCoustra, Martin R. S. ; Arrighi, Valeria. / Efficient defluoridation of water by Monetite nanorods. In: Adsorption. 2018 ; Vol. 24, No. 2. pp. 135-145.
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Shen, J, Evangelista, MF, Mkongo, G, Wen, H, Langford, R, Rosair, GM, McCoustra, MRS & Arrighi, V 2018, 'Efficient defluoridation of water by Monetite nanorods', Adsorption, vol. 24, no. 2, pp. 135-145. https://doi.org/10.1007/s10450-017-9928-8

Efficient defluoridation of water by Monetite nanorods. / Shen, Junjie; Evangelista, Marina Franchi; Mkongo, Godfrey; Wen, Haibao; Langford, Richard; Rosair, Georgina Margaret; McCoustra, Martin R. S.; Arrighi, Valeria.

In: Adsorption, Vol. 24, No. 2, 02.2018, p. 135-145.

Research output: Contribution to journalArticle

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T1 - Efficient defluoridation of water by Monetite nanorods

AU - Shen, Junjie

AU - Evangelista, Marina Franchi

AU - Mkongo, Godfrey

AU - Wen, Haibao

AU - Langford, Richard

AU - Rosair, Georgina Margaret

AU - McCoustra, Martin R. S.

AU - Arrighi, Valeria

PY - 2018/2

Y1 - 2018/2

N2 - Novel Monetite nanorods were successfully prepared for fluoride removal for the first time. The fluoride adsorption on the Monetite nanorods was studied by the batch adsorption technique. The Monetite nanorods were characterized by transmission electron microscope (TEM), X-ray powder diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), and the point of zero charge (pHPZC) measurement. The results revealed that the Monetite nanorods transformed to fluorapatite after adsorbing fluoride. The adsorption kinetics followed the pseudo-second-order model, and the adsorption isotherms couldbe well described by the Sips model. The maximum adsorption capacity was 222.88 mg g−1 at pH 7, 328 K when the initial fluoride concentration was 300 mg L−1 and the Monetite dose was 1 g L−1. The thermodynamic parameters revealed that the adsorption of fluoride onto Monetite nanorods was spontaneous and endothermic. The effects of different parameters including adsorbent dosage, pH, initial fluoride concentration and co-existing anions were investigated to understand the adsorption behaviour of Monetite nanorods under various conditions. Their adsorption capacities decreased with the increase of adsorbent dosage, and also decreased with the increase of pH. Electrostatic attraction and ion exchange were found to be the major mechanisms governing the adsorption of fluoride onto Monetite nanorods. Furthermore, a field study was conducted with the water from a fluoride endemic area in Tanzania. This study demonstrated that the synthesized Monetite nanorods were very effective adsorbents for defluoridation applications.

AB - Novel Monetite nanorods were successfully prepared for fluoride removal for the first time. The fluoride adsorption on the Monetite nanorods was studied by the batch adsorption technique. The Monetite nanorods were characterized by transmission electron microscope (TEM), X-ray powder diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), and the point of zero charge (pHPZC) measurement. The results revealed that the Monetite nanorods transformed to fluorapatite after adsorbing fluoride. The adsorption kinetics followed the pseudo-second-order model, and the adsorption isotherms couldbe well described by the Sips model. The maximum adsorption capacity was 222.88 mg g−1 at pH 7, 328 K when the initial fluoride concentration was 300 mg L−1 and the Monetite dose was 1 g L−1. The thermodynamic parameters revealed that the adsorption of fluoride onto Monetite nanorods was spontaneous and endothermic. The effects of different parameters including adsorbent dosage, pH, initial fluoride concentration and co-existing anions were investigated to understand the adsorption behaviour of Monetite nanorods under various conditions. Their adsorption capacities decreased with the increase of adsorbent dosage, and also decreased with the increase of pH. Electrostatic attraction and ion exchange were found to be the major mechanisms governing the adsorption of fluoride onto Monetite nanorods. Furthermore, a field study was conducted with the water from a fluoride endemic area in Tanzania. This study demonstrated that the synthesized Monetite nanorods were very effective adsorbents for defluoridation applications.

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M3 - Article

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Shen J, Evangelista MF, Mkongo G, Wen H, Langford R, Rosair GM et al. Efficient defluoridation of water by Monetite nanorods. Adsorption. 2018 Feb;24(2):135-145. https://doi.org/10.1007/s10450-017-9928-8