title: Effect of calcination temperature on Mg-Al bimetallic oxides as sorbents for the removal of F(-) in aqueous solutions.
abstract: Bimetallic oxides were synthesized from hydrotalcite using increasing calcination temperatures (873, 1073, 1273 K). These bimetallic oxides were fully characterized and the sorption density of F(-) was investigated. X-ray diffraction patterns for the produced bimetallic oxides showed that MgO was the primary phase within the range of investigated calcination temperatures, but MgO crystallinity increased with calcination temperature and an additional MgAl2O4 phase was formed. In the process of F(-) sorption, the bimetallic oxides were primarily transformed into hydrotalcite with intercalation of F(-). The Higher calcination temperature increased the MgAl2O4 phase, which did not contribute to the immobilization of F(-). These findings show that optimizing the calcination temperature can be used to maximize the sorption density of this material for F(-) removal.
authors.affiliation: Department of Earth Resource Engineering, Kyushu University, Fukuoka 819-0395, Japan. Electronic address: sayo.moriyama@yahoo.com.
authors.forename: Sayo
authors.initials: S
authors.lastname: Moriyama
authors.forename: Keiko
authors.initials: K
authors.lastname: Sasaki
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Hirajima
mesh_terms: D000327:Adsorption; D000535:Aluminum / Q000737:chemistry*; D000536:Aluminum Hydroxide / Q000737:chemistry; D000537:Aluminum Oxide / Q000737:chemistry; D056831:Coordination Complexes / Q000737:chemistry; D052918:Environmental Restoration and Remediation / Q000379:methods; D005461:Fluorine / Q000737:chemistry*; D006358:Hot Temperature; D008274:Magnesium / Q000737:chemistry*; D008276:Magnesium Hydroxide / Q000737:chemistry; D008277:Magnesium Oxide / Q000737:chemistry; D018508:Water Purification / Q000379:methods; D014961:X-Ray Diffraction
chemical_list: D056831:Coordination Complexes; C111130:spinell; C010467:hydrotalcite; D005461:Fluorine; D008277:Magnesium Oxide; D000536:Aluminum Hydroxide; D000535:Aluminum; D008274:Magnesium; D000537:Aluminum Oxide; D008276:Magnesium Hydroxide
keywords: Bimetallic oxide; Calcination temperature; Fluoride; Hydrotalcite; Sorption