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Combustion synthesis and stability of nanocrystalline La_2O_3 via ethanolamine-nitrate process

Combustion synthesis and stability of nanocrystalline La_2O_3 via ethanolamine-nitrate process
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摘要 Pure nanocrystalline La2O3 powders were successfully prepared by the combustion method.The effect of ethanolamine-to-nitrate ratio on phase composition and crystallite size of the combustion products was systematically investigated.Pure hexagonal La2O3 powders were almost formed in stoichiometric reaction(ψ=1.15),while metallic La phase was obtained in fuel-rich conditions(ψ≥3.0).The as-synthesized hexagonal La2O3 was found to be chemically unstable in ambient air since a complete transformation to hexagonal La(OH)3 was detected after 24 h exposure to air.The resulting hexagonal La(OH)3 showed an excellent ability to remove water pollutant and could nearly remove 100% of the Congo red at room temperature with a removal capacity of 143.5 mg Congo red/g.The phosphate adsorption data on hexagonal La(OH)3 agreed well with the Langmuir model with the estimated maximum adsorption capacity of 57.8 mg/g. Pure nanocrystalline La2O3 powders were successfully prepared by the combustion method.The effect of ethanolamine-to-nitrate ratio on phase composition and crystallite size of the combustion products was systematically investigated.Pure hexagonal La2O3 powders were almost formed in stoichiometric reaction(ψ=1.15),while metallic La phase was obtained in fuel-rich conditions(ψ≥3.0).The as-synthesized hexagonal La2O3 was found to be chemically unstable in ambient air since a complete transformation to hexagonal La(OH)3 was detected after 24 h exposure to air.The resulting hexagonal La(OH)3 showed an excellent ability to remove water pollutant and could nearly remove 100% of the Congo red at room temperature with a removal capacity of 143.5 mg Congo red/g.The phosphate adsorption data on hexagonal La(OH)3 agreed well with the Langmuir model with the estimated maximum adsorption capacity of 57.8 mg/g.
作者 LONG Yulin YANG Jun LI Xiaoci HUANG Weiya TANG Yu ZHANG Yuanming 龙俞霖;杨骏;李小慈;黄微雅;唐渝;张渊明(Department of Chemistry,Jinan University,Guangzhou 510632,China)
出处 《Journal of Rare Earths》 SCIE EI CAS CSCD 2012年第1期48-52,共5页 稀土学报(英文版)
基金 Project supported by the National Natural Science Foundation of China (2008ZX07211-003) Team Project of Natural Science Foundation of Guangdong Province (05200555)
关键词 OXIDES combustion synthesis X-ray diffraction ETHANOLAMINE rare earths oxides combustion synthesis X-ray diffraction ethanolamine rare earths
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