Abstract
The adsorption kinetics of fluoride onto limestone (LS) and Mg(OH)2-amended LS were investigated using batch adsorption technique. Data were best fitted to second-order and Elovich models. The Mg(OH)2-ameded LS showed substantial increases in F− adsorption relative to native LS. Similarity of ionic radii and charge of both F− and OH− were hypothesized to be the major cause of such increases. The OH− functional group of the surface Mg(OH)2 could be exchanged by aqueous F− through surface complexation (ligand exchange). No background effect of naturally occurring anions in F−-rich groundwater on adsorption capacity of Mg(OH)2-amended LS. The results reveal that the Mg(OH)2-amended LS can be environmentally safe and economical for F− removal.
Highlights
Shortage in fresh water supply in Jordan has been in steady increase due to high-popoulation growth rate, socioeconomic development, poor management of water resources and the resultant contamination of these resources by a myriad of pollutants (Abu-Sharar 2005)
The results demonstrated a relatively low adsorption capacity of iron corrosion products, while those based on co-precipitation/flocculation were better suitable
Some decreases in Cl and Na concentrations of Magensia LS were observed as a result of the washing steps
Summary
Shortage in fresh water supply in Jordan has been in steady increase due to high-popoulation growth rate, socioeconomic development, poor management of water resources and the resultant contamination of these resources by a myriad of pollutants (Abu-Sharar 2005). One of these pollutants is fluoride which can be detected in appreciable levels in different water resources as a product of weathering of the bearing minerals. Ground waters with high F− concentrations are reported in many areas of the world (Ahn 2012; Karro and Uppin 2013). Fluoride consumption in small amounts is usually beneficial for normal mineralization of bones and formation of dental enamel, while long term consumption of water containing excessive amounts of F − can
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
