Nano Lanthanum Oxide Preparation by Alkalescent Ammonium Citrate System and Its Primary Biological Effect
来源期刊：JOURNAL OF RARE EARTHS2004年第6期
论文作者：范玉斌 伍艳平 黄小卫 杨军 王甲辰 刘向生
Key words：nano La2O3 alkalescent ammonium citrate; homogeneous precipitation; biological effect; rare earths;
Abstract: Using alkalescent ammonium(AAC)as precipitatnt, the diameter of nano La2O3 powder with diameter in 80 nm and less was prepared by the method of homogeneous precipitation, and reactant concentration, temperature and pH were studied and confirmed. The best precipitated concentration is from 0.2 to 0.5 mol·L-1, and the diameter of compounded powder turns small as the temperature gradually becomes high, and the pH from 6 to 8 is the best and the concentration of precipitant does not affect the diameter of compounded powder significantly. Meanwhile, most experiments lasting for fifty days in the greenhouse, and the results are 0.2 g·kg-1 nano La2O3 powder is enorgh for increasing biomass by 133% compared with that of the CK.
范玉斌1，伍艳平1，黄小卫1，杨军1，王甲辰1，刘向生1
(1.Beijing General Research Institutes for Nonferrous Metals,Beijing 100088, China;
2. National Rare Earth Center for Agriculture,Beijing 100088,China;
3.Grirem Advanced Materials Co.,Ltd, Beijing 100088,China)
Abstract:Using alkalescent ammonium(AAC)as precipitatnt, the diameter of nano La2O3 powder with diameter in 80 nm and less was prepared by the method of homogeneous precipitation, and reactant concentration, temperature and pH were studied and confirmed. The best precipitated concentration is from 0.2 to 0.5 mol·L-1, and the diameter of compounded powder turns small as the temperature gradually becomes high, and the pH from 6 to 8 is the best and the concentration of precipitant does not affect the diameter of compounded powder significantly. Meanwhile, most experiments lasting for fifty days in the greenhouse, and the results are 0.2 g·kg-1 nano La2O3 powder is enorgh for increasing biomass by 133% compared with that of the CK.
Key words:nano La2O3 alkalescent ammonium citrate; homogeneous precipitation; biological effect; rare earths;
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