10.1021/ie500503b.s001
Tongbao Zhang
Tongbao
Zhang
Dawei Xin
Dawei
Xin
Yangcheng Lu
Yangcheng
Lu
Guangsheng Luo
Guangsheng
Luo
Direct
Precipitation for a Continuous Synthesis of
Nanoiron Phosphate with High Purity
American Chemical Society
2014
purity
pH
species
source
Fe
iron phosphate precipitation
High PurityA microreactor
mixture
HPO
phosphoric acid addition
nanoiron phosphate
precipitation process
hydrolysis
2014-04-23 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Direct_Precipitation_for_a_Continuous_Synthesis_of_Nanoiron_Phosphate_with_High_Purity/2303374
A 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 Fe<sup>3+</sup> 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 Fe<sup>3+</sup> 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, Fe<sup>3+</sup> and HPO<sub>4</sub><sup>2–</sup> 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.