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Stability and Synergistic Effect of Polyaniline/TiO2 Photocatalysts in Degradation of Azo Dye in Wastewater

Gilja, Vanja; Novaković, Katarina; Travaš-Sejdić, Jadranka; Hrnjak-Murgić, Zlata; Kraljić Roković, Marijana; Žic, Mark (2017) Stability and Synergistic Effect of Polyaniline/TiO2 Photocatalysts in Degradation of Azo Dye in Wastewater. Nanomaterials, 7 (12). ISSN 2079-4991

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The polyaniline/TiO2 (PANI/TiO2) composite photocatalysts were prepared by the in situ chemical oxidation of aniline (An) in the presence of TiO2 particles. For this purpose, photocatalysts with different amounts of PANI polymer were prepared and analysed. Fouriertransform infrared (FT-IR) spectroscopy and thermogravimetric (TG) analysis indicated successful synthesis of the PANI polymer and its conductivity was also determined. The micrographs of field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) were used to explain the impact of the aniline amount on the aggregation process during the synthesis of the composites. The smallest size of aggregates was obtained for the photocatalysts with 15% of PANI (15PANI/TiO2) due to the formation of homogenous PANI. The photocatalytic activity of studied PANI/TiO2 photocatalysts was validated by monitoring the discoloration and mineralization of Reactive Red azo dye (RR45) in wastewater. The 15PANI/TiO2 sample presented the highest photocatalytic efficiency under ultraviolet A (UVA) irradiation, in comparison to pure TiO2. This was explained by the formation of uniformly dispersed PANI on the TiO2 particles, which was responsible for the synergistic PANI-TiO2 effect.

Item Type: Article
Uncontrolled Keywords: wastewater treatment ; Reactive Red 45 ; photocatalysis ; UVA/Vis irradiation ; polyaniline/TiO2 ; composite photocatalysts ; in situ synthesis
Subjects: NATURAL SCIENCES > Chemistry
TECHNICAL SCIENCES > Chemical Engineering
Divisions: Division of Materials Physics
Project titleProject leaderProject codeProject type
Razvoj fotokatalitičkih polimernih nanokompozita za obradu otpadnih voda-DePoNPhotoZlata Hrnjak-MurgićIP-2013-11-5092HRZZ
Depositing User: Mark Žic
Date Deposited: 12 Jun 2019 12:45
DOI: 10.3390/nano7120412

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