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Direct Precipitation for a Continuous Synthesis of Nanoiron Phosphate with High Purity
journal contribution
posted on 2014-04-23, 00:00 authored by Tongbao Zhang, Dawei Xin, Yangcheng Lu, Guangsheng LuoA microreactor competent to control
the microprecipitation environment
is exploited to investigate the direct precipitation process between
iron and phosphorus sources. The dependency of the reaction species
on the purity of the final products is revealed. The Fe3+ hydrolysis and the pH of the mixture are confirmed to have decisive
influences on the generation of byproducts. The addition of phosphoric
acid in the iron source is verified to be an effective method to simultaneously
inhibit Fe3+ hydrolysis and adjust the pH of the mixture.
By optimizing the amount of phosphoric acid addition, pure nanoiron
phosphate with an average size of ca. 20 nm is successfully prepared
by a continuous precipitation process. Assuming instantaneous mixing
and fast precipitation reactions, Fe3+ and HPO42– are indicated as the main species during the
pure iron phosphate precipitation. The criteria would lay a practical
guidance for achieving a continuous synthesis of nanoiron phosphate
with high purity.