One-pot synthesis of sulfur-doped TiO$_2$/reduced graphene oxide composite (S-TiO$_2$/rGO) with improved photocatalytic activity for the removal of diclofenac from water

Kovačić, Marin (avtor), Perović, Klara (avtor), Papac, Josipa (avtor), Tomić, Antonija (avtor), Matoh, Lev (avtor), Žener, Boštjan (avtor), Brodar, Tomislav (avtor), Capan, Ivana (avtor), Surca, Angelja Kjara (avtor), Kušić, Hrvoje (avtor), Lavrenčič Štangar, Urška (avtor), Lončarić Božić, Ana (avtor)

Sulfur-doped TiO$_2$ (S-TiO$_2$) composites with reduced graphene oxide (rGO), wt. % of rGO equal to 0.5%, 2.75%, and 5.0%, were prepared by a one-pot solvothermal procedure. The aim was to improve photocatalytic performance in comparison to TiO$_2$ under simulated solar irradiation for the treatment of diclofenac (DCF) in aqueous medium. The obtained composites were characterized for physical-chemical properties using thermogravimetric analysis (TGA), X-ray diffractograms (XRD), Raman, scanning electron microscopy (SEM)/energy dispersive X-ray (EDX), Brauner Emmett Teller (BET), and photoluminescence (PL) analyses, indicating successful sulfur doping and inclusion of rGO. Sulfur doping and rGO have successfully led to a decrease in photogenerated charge recombination. However, both antagonistic and synergistic effects toward DCF treatment were observed, with the latter being brought forward by higher wt.% rGO. The composite with 5.0 wt.% rGO has shown the highest DCF conversion at pH 4 compared to that obtained by pristine TiO$_2$, despite lower DCF adsorption during the initial dark period. The expected positive effects of both sulfur doping and rGO on charge recombination were found to be limited because of the subpar interphase contact with the composite and incomplete reduction of the GO precursor. Consequent unfavorable interactions between rGO and DCF negatively influenced the activity of the studied S-TiO$_2$/rGO photocatalyst under simulated solar irradiation.

• Jezik: Angleški jezik
• Ključne besede: photocatalysis, sulfur doped titanium dioxide, composite, reduced graphene oxide, diclofenac, solar photocatalysis, TiO$_2$-reduced graphene oxide composite
• 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: 2020
• Št. strani: 14 str.
• Številčenje: Vol. 13, iss. 7, art. 1621
• PID: 20.500.12556/RUL-133389
• UDK: 620:549.514.6:544.526.5
• ISSN pri članku: 1996-1944
• DOI: 10.3390/ma13071621
• COBISS.SI-ID: 1538563267
• Datum objave v RUL: 25.11.2021

Gradivo je del revije

• Naslov: Materials
• Skrajšan naslov: Materials
• Založnik: MDPI
• ISSN: 1996-1944
• COBISS.SI-ID: 33588485

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.
• Začetek licenciranja: 01.04.2020

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: fotokataliza, titanov dioksid dopiran z žveplom, kompoziti, reduciran grafen oksid, diklofenak