| Summary: | 碩士 === 國立中興大學 === 材料科學與工程學系所 === 98 === This work describes a novel method based on a metal salt-free system to synthesize a Li–Al–A layered double hydroxide (LDH) (A = NO3, Cl or CO3) in relatively short time at room temperature. This study use AlLi intermerallic compoumd to frabracate an alkaline content Li+ and Al+. Introduce HNO3, HCl or CO2 into the alkaline aqueous to supply the anion, NO3–, Cl– or CO32–, to frabracate Li–Al–A LDH samples. Washing in water was unnecessary because metal salts were not used to synthesize the LDH. The chemical analysis data indicated that the chemical formula of Li–Al–NO3 LDH, Li–Al–Cl LDH and Li–Al–CO3 LDH in this study was Li0.34Al0.66(OH)2(NO3)0.32•mH2O, Li0.37Al0.63(OH)2(CO3)0.26•mH2O and Li0.35Al0.65(OH)2Cl0.31•mH2O, respectively. This work also investigates the removal of the fluoride ions from an aqueous solution by using Li–Al–A LDH samples. The result indcated that Li–Al–A LDH samples can absorb fluoride ions from the fluoride-containing water effectively. The results indicate that the fluoride absorption abilities are in the order of Li–Al–NO3 LDH > Li–Al–Cl LDH > Li–Al–CO3 LDH.
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