Analysis of F− removal from aqueous solutions using MgO. (October 2018)

• Record Type: Journal Article
• Authors: Kameda, Tomohito; Yamamoto, Yusuke; Kumagai, Shogo; Yoshioka, Toshiaki
• Is Part Of: Journal of water process engineering. Volume 25(2018)
• Page Start: 54
• Page End: 57
• Publication Date: 2018-10
• Subjects: MgO -- F−Water treatment -- Kinetics -- Equilibrium; Water-supply engineering -- Periodicals; Saline water conversion -- Periodicals; Seawater -- Distillation -- Periodicals; Sanitary engineering -- Periodicals; Sewage -- Purification -- Periodicals; 627
• DOI: 10.1016/j.jwpe.2018.06.009
• Languages: English
• ISSNs: 2214-7144

Abstract

Abstract: MgO was found to take up F − from NaF aqueous solutions due to the electrostatic attractive force between the positively charged MgO and F − . The F − adsorption by MgO can be represented by pseudo first-order reaction kinetics, and the magnitude of the apparent activation energy (71.6 kJ mol −1 ) confirms that this is a chemisorption process. The thermodynamic behavior of this process follows Langmuir-type adsorption, with the maximum adsorption amount of 5.6 mmol g –1 . The F − can be desorbed from MgO using NaOH solution. The regenerated MgO can still take up F − from the solution despite the lowered adsorption capacity. Therefore, it is possible to recycle the MgO for F − adsorption.