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Hybrid TiO₂-Polyaniline Photocatalysts and their Application in Building Gypsum Plasters.

ABSTRACT: Hybrid materials of conjugated polymer and titanium(IV) oxide have attracted considerable attention concerning their potential benefits, including (i) efficient exploitation of visible light, (ii) a high adsorption capacity for organic contaminants, (iii) and effective charge carriers separation. The new class of the photocatalysts is promising for the removal of environmental pollutants in both aqueous and gaseous phases. For the first time, in this study, the polyaniline (PANI)-TiO₂ hybrid composite was used for the degradation of phenol in water and toluene in the gas phase. Polyaniline-TiO₂ was prepared by the in situ polymerization of aniline on the TiO₂ surface. The obtained hybrid material was characterized by diffuse reflectance spectroscopy (DR/UV-Vis), X-ray diffraction (XRD), fast-Fourier transformation spectroscopy (FTIR), photoluminescence (PL) spectroscopy, microscopy analysis (SEM/TEM), and thermogravimetric analysis (TGA). An insight into the mechanism was shown based on the photodegradation analysis of charge carrier scavengers. Polyaniline is an efficient TiO₂ photosensitizer for photodegradation in visible light (? > 420 nm). The trapping experiments revealed that mainly h+ and ?OH were the reactive oxygen species that were responsible for phenol degradation. Furthermore, the PANI-TiO₂ hybrid nanocomposite was used in gypsum plaster to study the self-cleaning properties of the obtained building material. The effect of PANI-TiO₂ content on the hydrophilic/hydrophobic properties and crystallographic structure of gypsum was studied. The obtained PANI-TiO₂-modified gypsum plaster had improved photocatalytic activity in the reaction of toluene degradation under Vis light.

SUBMITTER: Sulowska A

PROVIDER: S-EPMC7177723 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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Hybrid TiO<sub>2</sub>-Polyaniline Photocatalysts and their Application in Building Gypsum Plasters.

Sulowska Agnieszka A Wysocka Izabela I Pelczarski Daniel D Karczewski Jakub J Zielińska-Jurek Anna A

Materials (Basel, Switzerland) 20200326 7

Hybrid materials of conjugated polymer and titanium(IV) oxide have attracted considerable attention concerning their potential benefits, including (i) efficient exploitation of visible light, (ii) a high adsorption capacity for organic contaminants, (iii) and effective charge carriers separation. The new class of the photocatalysts is promising for the removal of environmental pollutants in both aqueous and gaseous phases. For the first time, in this study, the polyaniline (PANI)-TiO<sub>2</sub> ...[more]

PMID: 32224943

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Project description:The preparation of visible-light-driven photocatalysts has become highly appealing for environmental remediation through simple, fast and green chemical methods. The current study reports the synthesis and characterization of graphitic carbon nitride/titanium dioxide (g-C3N4/TiO2) heterostructures through a fast (1 h) and simple microwave-assisted approach. Different g-C3N4 amounts mixed with TiO2 (15, 30 and 45 wt. %) were investigated for the photocatalytic degradation of a recalcitrant azo dye (methyl orange (MO)) under solar simulating light. X-ray diffraction (XRD) revealed the anatase TiO2 phase for the pure material and all heterostructures produced. Scanning electron microscopy (SEM) showed that by increasing the amount of g-C3N4 in the synthesis, large TiO2 aggregates composed of irregularly shaped particles were disintegrated and resulted in smaller ones, composing a film that covered the g-C3N4 nanosheets. Scanning transmission electron microscopy (STEM) analyses confirmed the existence of an effective interface between a g-C3N4 nanosheet and a TiO2 nanocrystal. X-ray photoelectron spectroscopy (XPS) evidenced no chemical alterations to both g-C3N4 and TiO2 at the heterostructure. The visible-light absorption shift was indicated by the red shift in the absorption onset through the ultraviolet-visible (UV-VIS) absorption spectra. The 30 wt. % of g-C3N4/TiO2 heterostructure showed the best photocatalytic performance, with a MO dye degradation of 85% in 4 h, corresponding to an enhanced efficiency of almost 2 and 10 times greater than that of pure TiO2 and g-C3N4 nanosheets, respectively. Superoxide radical species were found to be the most active radical species in the MO photodegradation process. The creation of a type-II heterostructure is highly suggested due to the negligible participation of hydroxyl radical species in the photodegradation process. The superior photocatalytic activity was attributed to the synergy of g-C3N4 and TiO2 materials.

Dataset Information

Hybrid TiO₂-Polyaniline Photocatalysts and their Application in Building Gypsum Plasters.

Publications

Hybrid TiO<sub>2</sub>-Polyaniline Photocatalysts and their Application in Building Gypsum Plasters.

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Dataset Information

Hybrid TiO2-Polyaniline Photocatalysts and their Application in Building Gypsum Plasters.

Publications

Hybrid TiO<sub>2</sub>-Polyaniline Photocatalysts and their Application in Building Gypsum Plasters.

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OmicsDI is part of the ELIXIR infrastructure

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Hybrid TiO₂-Polyaniline Photocatalysts and their Application in Building Gypsum Plasters.