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Adsorption

, Volume 24, Issue 2, pp 135–145 | Cite as

Efficient defluoridation of water by Monetite nanorods

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

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.

Keywords

Monetite Nanorods Fluoride Adsorption Drinking water 

Notes

Acknowledgements

This study was funded by the School of Engineering and Physical Sciences, Heriot-Watt University. The PhD studentship for Junjie Shen was provided by Energy Technology Partnership (ETP) Scholarship with Drinking Water Quality Regulator for Scotland (DWQR) as the industrial sponsor. Scottish Water is thanked for analysing the Tanzanian water sample.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

10450_2017_9928_MOESM1_ESM.docx (138 kb)
Supplementary material 1 (DOCX 138 KB)

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Copyright information

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Authors and Affiliations

  1. 1.School of Engineering and Physical SciencesHeriot-Watt UniversityEdinburghUK
  2. 2.Department of Chemical Engineering, Centre for Advanced Separations EngineeringUniversity of BathBathUK
  3. 3.Ngurdoto Defluoridation Research StationUsa RiverTanzania
  4. 4.Department of EconomicsUniversity of BathBathUK
  5. 5.Cavendish Laboratory, Department of PhysicsUniversity of CambridgeCambridgeUK

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