Research output: Contribution to journal › Article › peer-review
Enhancement of acidic-basic properties of silica by modification with CeO 2 -Fe 2 O 3 nanoparticles via successive ionic layer deposition. / Popkov, V. I.; Tolstoy, V. P.; Omarov, S. O.; Nevedomskiy, V. N.
In: Applied Surface Science, Vol. 473, 15.04.2019, p. 313-317.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Enhancement of acidic-basic properties of silica by modification with CeO 2 -Fe 2 O 3 nanoparticles via successive ionic layer deposition
AU - Popkov, V. I.
AU - Tolstoy, V. P.
AU - Omarov, S. O.
AU - Nevedomskiy, V. N.
PY - 2019/4/15
Y1 - 2019/4/15
N2 - alpha-CeO2 and alpha-Fe2O3 nanocrystals were successfully synthesized by successive ionic layer deposition (SILD). The size of the prepared nanocrystals of alpha-CeO2 and alpha-Fe2O3 is 6-8 nm and 13-14 nm, correspondingly. The developed method was used to modify silica gel. The obtained samples were characterized by EDX, SEM, TEM-ED, PXRD; and N-2 adsorption-desorption analysis and analysis of acid-base properties were made. There was established that the silica gel modification with 4.1 mass % of alpha-CeO2 and alpha-Fe2O3 nanocrystals lead to increase of acidic/basic sites in 6.6 and 13.6 times, correspondingly, while maintaining the surface area of modified silica about 311 m(2)/g and almost unchanged pore structure. It was shown that alpha-CeO2 and alpha-Fe2O3 nanocrystals forming by SILD modification of silica gel are mainly found in the micropores and mesopores and define the phenomenon of the increase of active sites concentration in the prepared composite. The resulting materials can be used as the basis for promising acid-base catalysts and sorbents of toxic heavy metal cations and oxyanions.
AB - alpha-CeO2 and alpha-Fe2O3 nanocrystals were successfully synthesized by successive ionic layer deposition (SILD). The size of the prepared nanocrystals of alpha-CeO2 and alpha-Fe2O3 is 6-8 nm and 13-14 nm, correspondingly. The developed method was used to modify silica gel. The obtained samples were characterized by EDX, SEM, TEM-ED, PXRD; and N-2 adsorption-desorption analysis and analysis of acid-base properties were made. There was established that the silica gel modification with 4.1 mass % of alpha-CeO2 and alpha-Fe2O3 nanocrystals lead to increase of acidic/basic sites in 6.6 and 13.6 times, correspondingly, while maintaining the surface area of modified silica about 311 m(2)/g and almost unchanged pore structure. It was shown that alpha-CeO2 and alpha-Fe2O3 nanocrystals forming by SILD modification of silica gel are mainly found in the micropores and mesopores and define the phenomenon of the increase of active sites concentration in the prepared composite. The resulting materials can be used as the basis for promising acid-base catalysts and sorbents of toxic heavy metal cations and oxyanions.
KW - A. Nanocrystals
KW - B. Successive ionic layer deposition
KW - C. Cerium iron mixed oxides
KW - D. Acidic-basic properties
KW - FUNDAMENTALS
KW - Cerium iron mixed oxides
KW - Acidic-basic properties
KW - ELECTRODES
KW - COMBUSTION SYNTHESIS
KW - HYDROGEN
KW - Nanocrystals
KW - METHANE
KW - CEO2
KW - Successive ionic layer deposition
UR - http://www.scopus.com/inward/record.url?scp=85058663117&partnerID=8YFLogxK
UR - http://www.mendeley.com/research/enhancement-acidicbasic-properties-silica-modification-ceo-2-fe-2-o-3-nanoparticles-via-successive-i
U2 - 10.1016/j.apsusc.2018.12.129
DO - 10.1016/j.apsusc.2018.12.129
M3 - Article
AN - SCOPUS:85058663117
VL - 473
SP - 313
EP - 317
JO - Applied Surface Science
JF - Applied Surface Science
SN - 0169-4332
ER -
ID: 42174347