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Preparation of Ag Nano-Powder from Aqueous Silver Nitrate Solution through Reduction with Hydrazine Hydrate  

Lee, Hwa-Young (Battery Research Center, Korea Institute of Science & Technology)
Publication Information
Resources Recycling / v.15, no.4, 2006 , pp. 19-26 More about this Journal
Abstract
The preparation of Ag nano-powder from aqueous silver nitrate solution, which would be available for the recycling of silver bearing wastes, was investigated by a reductive precipitation reaction using hydrazine hydrate as a reducing agent. Silver solution was prepared by dissolving silver nitrate with distilled water, and then the dispersant, Tamol NN8906 or Tween 20, was also mixed to avoid the agglomeration of particles during the reductive reaction followed by the addition of hydrazine hydrate to prepare Ag nano-particles. Ag particles obtained from the reduction reaction from silver solution were characterized using the particle size analyzer and TEM to determine the particle size distribution and morphology. It was found that about 100% excess of hydrazine hydrate was required to reduce completely silver ions in the solution. Ag powders with very narrow distribution could be obtained when Tamol NN8906 was used as the dispersant. In case of Tween 20, the particle size distribution showed typically the bimodal or multimodal distribution and the morphology of Ag particles was found to be irregular shape in both cases.
Keywords
recycling; silver; nano particle; reductant; dispersant;
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Times Cited By KSCI : 1  (Citation Analysis)
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