The effect of hydroxyl groups and surface area of hematite derived from annealing goethite for phosphate removal

Liu, Haibo , Chen, Tianhu, Chang, Jin, Zou, Xuehua, & Frost, Ray L. (2013) The effect of hydroxyl groups and surface area of hematite derived from annealing goethite for phosphate removal. Journal of Colloid and Interface Science, 398, pp. 88-94.

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Abstract

Synthetic goethite and thermally treated goethite at different temperatures were used to remove phosphate from sewage. The effect of annealing temperature on phosphate removal over time was investigated. X-ray diffraction(XRD), transmission electron microscopy (TEM), N2 adsorption and desorption (BET), and infrared emission spectrum (FT-IES) were utilized to characterize the phase, morphology, specific surface area, pore distribution, and the surface groups of samples. The results show that annealed products of goethite at temperatures over 250 °C are hematite with the similar morphology as the original goethite with different hydroxyl groups and surface area. Increasing temperature causes the decrease in hydroxyl groups, consequential increase in surface area at first and then experiences a decrease (14.8–110.4–12.6 m2/g) and the subsequent formation of nanoscale pores. The variation rate of hydroxyl groups and surface area based on FT-IES and BET, respectively, are used to evaluate the effect of annealing temperature on phosphate removal. By using all of the characterization techniques, it is concluded that the changes of phosphate removal basically result from the total variation rate between hydroxyl groups and surface area.

Impact and interest:

18 citations in Scopus
14 citations in Web of Science®
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ID Code: 61343
Item Type: Journal Article
Refereed: Yes
Keywords: Goethite, Hematite, Hydroxyl group, Surface area, Phosphate removal
DOI: 10.1016/j.jcis.2013.02.016
ISSN: 1095-7103
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 Academic Press (Elsevier)
Deposited On: 16 Jul 2013 00:59
Last Modified: 18 Jul 2017 22:01

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