TY - JOUR
T1 - Process intensification for fast SrFe12O19 nanoparticle production from celestite under supercritical hydrothermal conditions
AU - Rendón-Angeles, J. C.
AU - Yoko, A.
AU - Seong, G.
AU - Tomai, T.
AU - Adschiri, T.
N1 - Funding Information:
One of the authors, Rendon-Angeles J.C., is in debt to CINVESTAV-IPN for allowing making a research stay Tohoku University to carry out this research. Thanks to the NEDO agency for the support granted and to Super Nano Co. & Ltd (Japan) for allowing us to carry out continuous flow reactor experiments. This research was supported by grants from the Japan Society for the Promotion of Science (JSPS); KAKENHI (Grant Number, JP16H06367 ), New Energy and Industrial Technology Development Organization (NEDO), and Advanced Institute for Materials Research (WPI-AIMR) Tohoku University established by World Premier International Research Center Initiative (WPI), Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. We thank Mr. Kesami Saito and Dr. Ryotaro Kumashiro at WPI-AIMR for their valuable assistance on the XRD and Fe-SEM characterization.
Funding Information:
One of the authors, Rendon-Angeles J.C. is in debt to CINVESTAV-IPN for allowing making a research stay Tohoku University to carry out this research. Thanks to the NEDO agency for the support granted and to Super Nano Co. & Ltd (Japan) for allowing us to carry out continuous flow reactor experiments. This research was supported by grants from the Japan Society for the Promotion of Science (JSPS); KAKENHI (Grant Number, JP16H06367), New Energy and Industrial Technology Development Organization (NEDO), and Advanced Institute for Materials Research (WPI-AIMR) Tohoku University established by World Premier International Research Center Initiative (WPI), Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. We thank Mr. Kesami Saito and Dr. Ryotaro Kumashiro at WPI-AIMR for their valuable assistance on the XRD and Fe-SEM characterization.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/1
Y1 - 2023/1
N2 - The Sr-ferrite nanoparticle preparation process was intensified using supercritical hydrothermal conditions by employing mineral SrSO4 and acidic Fe3+ solution. The new approach consists of two unit operations: the mineral (SrSO4) dissolution in a mild alkaline NaOH solution; and the Sr/Fe hydroxide coprecipitation using a Fe3+ acid solution. In the first stage, a Sr-Fe gel colloid (Sr/Fe = 0.5) prepared by mixing acid Fe3+ and alkaline Sr2+ liquors (obtained from SrSO4 feedstock) was treated under supercritical hydrothermal conditions at 400 °C for 10 min at 30 MPa, resulting in Sr-ferrite particle crystallization. The second stage comprises increasing the production efficiency by reducing the Sr/Fe ratio to 0.2 coupled with Sr-Fe gel dehydration. The intensified processing proposed has demonstrated high efficiency through continuous flow preparation, which proceeded at a feeding rate of 50 g/L at 400 °C for a 40 s residence time.
AB - The Sr-ferrite nanoparticle preparation process was intensified using supercritical hydrothermal conditions by employing mineral SrSO4 and acidic Fe3+ solution. The new approach consists of two unit operations: the mineral (SrSO4) dissolution in a mild alkaline NaOH solution; and the Sr/Fe hydroxide coprecipitation using a Fe3+ acid solution. In the first stage, a Sr-Fe gel colloid (Sr/Fe = 0.5) prepared by mixing acid Fe3+ and alkaline Sr2+ liquors (obtained from SrSO4 feedstock) was treated under supercritical hydrothermal conditions at 400 °C for 10 min at 30 MPa, resulting in Sr-ferrite particle crystallization. The second stage comprises increasing the production efficiency by reducing the Sr/Fe ratio to 0.2 coupled with Sr-Fe gel dehydration. The intensified processing proposed has demonstrated high efficiency through continuous flow preparation, which proceeded at a feeding rate of 50 g/L at 400 °C for a 40 s residence time.
KW - Celestite
KW - Chemical processing
KW - Nanoparticles
KW - Sol-gel
KW - Strontium ferrite
KW - Supercritical hydrothermal synthesis
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U2 - 10.1016/j.supflu.2022.105810
DO - 10.1016/j.supflu.2022.105810
M3 - Article
AN - SCOPUS:85142357706
SN - 0896-8446
VL - 192
JO - Journal of Supercritical Fluids
JF - Journal of Supercritical Fluids
M1 - 105810
ER -