Synergism in TiO$_2$ photocatalytic ozonation for the removal of dichloroacetic acid and thiacloprid

Šuligoj, Andraž (avtor), Kete, Marko (avtor), Černigoj, Urh (avtor), Fresno, Fernando (avtor), Lavrenčič Štangar, Urška (avtor)

The synergistic effect of the photocatalytic ozonation process (PH-OZ) using the photocatalyst TiO$_2$ is usually attributed to influences of the physicochemical properties of the catalyst, pollutant type, pH, temperature, O$_3$ concentration, and other factors. It is also often claimed that good adsorption on the TiO$_2$ surface is beneficial for the occurrence of synergism. Herein, we tested these assumptions by using five different commercial TiO$_2$ photocatalysts (P25, PC500, PC100, PC10 and JRC-TiO-6) in three advanced oxidation systems - photocatalysis (O$_2$/TiO$_2$/UV), catalytic ozonation (O$_3$/TiO$_2$) and PH-OZ (O$_3$/TiO$_2$/UV) - for the degradation of two pollutants (dichloroacetic acid - DCAA and thiacloprid) simultaneously present in water. The synergistic effect in PH-OZ was much more pronounced in the case of thiacloprid, a molecule with low adsorption on the surface of the catalyst - in contrast to DCAA with stronger adsorption. The faster kinetics of catalytic ozonation (O$_3$/TiO$_2$) correlated with the higher exposed surface area of TiO$_2$ agglomerates, independent of the (lower) BET surfaces of the primary particles. Nevertheless, DCAA mineralization on the TiO$_2$ surface was much faster than thiacloprid degradation in solution. Therefore, we propose that a high BET surface area of the photocatalyst is crucial for fast surface reactions (DCAA mineralization), while good dispersion - the high exposed surface area of the (small) agglomerates - and charge separation play an important role in photocatalytic degradation or PH-OZ of less adsorbed organic pollutants (thiacloprid).

• Jezik: Angleški jezik
• Ključne besede: water purification, adsorption, TiO$_2$ agglomerates, neonicotinoids, synergism
• 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: 2021
• Št. strani: 9 str.
• Številčenje: Vol. 197, art. 110982
• PID: 20.500.12556/RUL-138670
• UDK: 544.3/.4
• ISSN pri članku: 0013-9351
• DOI: 10.1016/j.envres.2021.110982
• COBISS.SI-ID: 57560067
• Datum objave v RUL: 09.08.2022

Gradivo je del revije

• Naslov: Environmental research : multidisciplinary journal of environmental sciences, ecology, and public health
• Skrajšan naslov: Environ. res.
• Založnik: Academic Press
• ISSN: 0013-9351
• COBISS.SI-ID: 3951911

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: fotokataliza, titanov dioksid, sinergija, učinki

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P1-0134
• Naslov: Kemija za trajnostni razvoj

• Financer: EC - European Commission
• Program financ.: European Social Fund, Operational Program for Human Resources Development