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|標題:||Synthesis of Li-Al-carbonate layered double hydroxide in a metal salt-free system|
|期刊/報告no：:||Journal of Materials Chemistry, Volume 20, Issue 31, Page(s) 6524-6530.|
|摘要:||This work describes a novel method based on a metal salt-free system to synthesize a Li-Al-CO(3) layered double hydroxide (LDH) by simply adding powdered AlLi intermetallic compound (IMC) to a stirred water-bath at ambient temperature and atmosphere. The AlLi powder in the water-bath hydrolyzed strongly, subsequently forming an alkaline Al(3+)- and Li(+)-containing aqueous solution of pH 12.3. Additionally, dissolution of CO(2) gas from the ambient atmosphere into the stirred alkaline solution produced the anion, CO(3)(2-), in the solution to form Li-Al-CO(3) LDH. Washing in water was unnecessary because metal salts were not used to synthesize the LDH. Notably, transmission electron microscopy (TEM) results indicate that nano-sized Al particles were incorporated on the surface of Li-Al-CO(3) LDH flakes. Chemical analysis data suggest that the chemical formula of Li-Al-CO(3) LDH was Li(0.33)Al(0.67)(CO(3))(0.17)(OH)(2)center dot mH(2)O. This work also investigates the removal of the fluoride ions from an aqueous solution by using Li-Al-CO(3) LDH. Experimentally, residual fluoride concentration decreased to 0.4 ppm with an initial concentration of 20 ppm, which satisfies World Health Organization (WHO) guidelines for drinking water quality.|
|Appears in Collections:||材料科學與工程學系|
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