TY  - JOUR
A1  - Pilar Yeste, Maria
A1  - Carlos Hernandez-Garrido, Juan
A1  - Kumke, Michael Uwe
A1  - Alvarado, Sarah
A1  - Cauqui, Miguel Angel
A1  - Juan Calvino, Jose
A1  - Primus, Philipp-Alexander
T1  - Low-temperature growth of reactive pyrochlore nanostructures on Zirconia-supported ceria
BT  - implications for improved catalytic behavior
JF  - ACS applied nano materials
N2  - The use of a catalyst support for the design of nanoscale heterogeneous catalysts based on cerium oxide offers vast possibilities for future catalyst development, particularly with regard to an increased focus on the use of renewable biogas and an emerging hydrogen economy. In this study, zirconia-supported ceria catalysts were synthesized, activated by using different thermochemical treatments, and characterized by way of temperature-programmed reduction (TPR), oxygen storage capacity, Xray diffraction, electron microscopy, and luminescence spectroscopy using Eu3+ as a spectroscopic probe. Through reduction-oxidation pretreatment routines, reactive pyrochlore structures were created at temperatures as low as 600 degrees C and identified through TPR and electron microscopy experiments. A structural relationship and alignment of the crystal planes is revealed in high-resolution scanning transmission electron microscopy experiments through the digital diffraction patterns. Low-temperature pretreatment induces the formation of reactive pyrochlore domains under retention of the surface area of the catalyst system, and no further morphological changes are detected. Furthermore, the formation of pyrochlore domains achieved through severe reduction and mild reoxidation (SRMO) treatments is reversible. Over multiple alternating SRMO and severe reduction and severe reoxidation (SRSO) treatments, europium spectroscopy and TPR results indicate that pyrochlore structures are recreated over consecutive treatments, whenever the mild oxidation step at 500 degrees C is the last treatment (SRMO, SRMO-SRSO-SRMO, etc.).
KW  - pyrochlore
KW  - nanocomposite
KW  - ceria
KW  - zirconia
KW  - supported catalyst
KW  - oxygen
KW  - storage capacity
Y1  - 2022
U6  - https://doi.org/10.1021/acsanm.2c00416
SN  - 2574-0970
VL  - 5
IS  - 5
SP  - 6316
EP  - 6326
PB  - American Chemical Society
CY  - Washington
ER  - 
TY  - JOUR
A1  - Unuabonah, Emmanuel Iyayi
A1  - Nöske, Robert
A1  - Weber, Jens
A1  - Günter, Christina
A1  - Taubert, Andreas
T1  - New micro/mesoporous nanocomposite material from low-cost sources for the efficient removal of aromatic and pathogenic pollutants from water
JF  - Beilstein journal of nanotechnology
N2  - A new micro/mesoporous hybrid clay nanocomposite prepared from kaolinite clay, Carica papaya seeds, and ZnCl2 via calcination in an inert atmosphere is presented. Regardless of the synthesis temperature, the specific surface area of the nanocomposite material is between approximate to 150 and 300 m(2)/g. The material contains both micro- and mesopores in roughly equal amounts. X-ray diffraction, infrared spectroscopy, and solid-state nuclear magnetic resonance spectroscopy suggest the formation of several new bonds in the materials upon reaction of the precursors, thus confirming the formation of a new hybrid material. Thermogravimetric analysis/differential thermal analysis and elemental analysis confirm the presence of carbonaceous matter. The new composite is stable up to 900 degrees C and is an efficient adsorbent for the removal of a water micropollutant, 4-nitrophenol, and a pathogen, E. coli, from an aqueous medium, suggesting applications in water remediation are feasible.
KW  - 4-nitrophenol
KW  - Carica papaya seeds
KW  - clay
KW  - E. coli
KW  - micro/mesoporous
KW  - nanocomposite
KW  - water remediation
Y1  - 2019
U6  - https://doi.org/10.3762/bjnano.10.11
SN  - 2190-4286
VL  - 10
SP  - 119
EP  - 131
PB  - Beilstein-Institut zur Förderung der Chemischen Wissenschaften
CY  - Frankfurt, Main
ER  - 
TY  - JOUR
A1  - Taubert, Andreas
A1  - Leroux, Fabrice
A1  - Rabu, Pierre
A1  - de Zea Bermudez, Veronica
T1  - Advanced hybrid nanomaterials
JF  - Beilstein journal of nanotechnology
KW  - colloidal chemistry
KW  - environmental remediation
KW  - hybrid nanomaterials
KW  - nanocomposite
KW  - nanofillers
KW  - nanomedicine
KW  - nanostructures
KW  - polymer fillers
KW  - pore templating
KW  - smart materials
Y1  - 2019
U6  - https://doi.org/10.3762/bjnano.10.247
SN  - 2190-4286
VL  - 10
SP  - 2563
EP  - 2567
PB  - Beilstein-Institut zur Förderung der Chemischen Wissenschaften
CY  - Frankfurt am Main
ER  -