Effect of Ce:Ti ratio and cerium salts on the properties of mesoporous Ti-Ce oxides and their photocatalytic activity

Nadrah, Peter (avtor), Knap, Mateja (avtor), Vikram Sagar, Tatiparthi (avtor), Sever Škapin, Andrijana (avtor), Lavrenčič Štangar, Urška (avtor)

To investigate the influence of different CeO$_2$ precursors and Ce:Ti ratios, we have synthesised 8 mesoporous Ti-Ce oxides via the evaporation-induced self-assembly (EISA) method with Ce:Ti ratios between 0.2 and 20 mol%. The materials exhibited type IV isotherms and a specific surface area of 140–180 m$^2$⋅g$^{−1}$ with pore diameters in range of 3–20 nm. The crystalline phases of materials comprised predominantly anatase with a significant decrease in overall crystalline content with increasing Ce:Ti ratio. Materials with higher Ce:Ti ratio showed an increased light absorption in the visible region. Although crystalline CeO$_2$ was not detected, the presence of Ce(IV) was confirmed by X-ray photoelectron spectroscopy. For the photocatalytic experiments, we compared these materials with the TiO$_2$-CeO$_2$ composites of our previously published syntheses to yield 16 samples synthesized via three synthesis approaches: (1) concurrent synthesis from titanium alkoxide and cerium salts in one pot, (2) synthesis of TiO$_2$ in the presence of previously-synthesised CeO$_2$ and (3) physical mixing of separately-synthesised TiO$_2$ and CeO$_2$. Samples produced by physically mixing the separately-synthesised TiO$_2$ and CeO$_2$ showed the best photocatalytic activity towards gaseous isopropanol degradation, while the samples with TiO$_2$ synthesised in the presence of CeO$_2$ showed the best photocatalytic stability.

• Jezik: Angleški jezik
• Ključne besede: Ti-Ce oxides, evaporation-induced self-assembly, isopropanol oxidation, photocatalysis, mesoporous material
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2025
• Št. strani: 7 str.
• Številčenje: Vol. 449, art. 115204
• PID: 20.500.12556/RUL-166707
• UDK: 54
• ISSN pri članku: 1873-4308
• DOI: 10.1016/j.cattod.2025.115204
• COBISS.SI-ID: 223125507
• Datum objave v RUL: 22.01.2025

Gradivo je del revije

• Naslov: Catalysis today
• Založnik: Elsevier
• ISSN: 1873-4308
• COBISS.SI-ID: 170235139

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: Ti-Ce oksidi, samourejanje z odparevanjem topila, oksidacija izopropanola, mezoporozni material