Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

Truppi, Alessandra; Petronella, Francesca; Placido, Tiziana; Striccoli, Marinella; Agostiano, Angela; Curri, Maria Lucia; Comparelli, Roberto

doi:10.3390/catal7040100

Cited by 100 publications

(40 citation statements)

References 162 publications

(240 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is known that TiO 2 is an excellent catalyst under UVA irradiation and a very poor one under solar (UVA/Vis) irradiation [39]. Therefore, to show that an improved 15PANI/TiO 2 photocatalytic activity is a result of the PANI-TiO 2 synergic effect, the RR45 degradation was conducted under UVA/Vis and Vis irradiation (Figure 10).…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2017

View full text Add to dashboard Cite

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. Fourier-transform 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.

show abstract

Section: Resultsmentioning

confidence: 99%

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

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The most attractive solutions to improve the photocatalytic performances of oxide-based systems rely on: (i) dye sensitization, (ii) charge transfer complex sensitization, (iii) heterostructures formation, frequently including carbon-based components, and (iv) metal and non-metal doping [7][8][9][10]. Doping of TiO 2 and other oxides has already been extensively investigated and reviewed.…”

Section: Introductionmentioning

confidence: 99%

Photosensitive Hybrid Nanostructured Materials: The Big Challenges for Sunlight Capture

2020

View full text Add to dashboard Cite

Solar radiation is becoming increasingly appreciated because of its influence on living matter and the feasibility of its application for a variety of purposes. It is an available and everlasting natural source of energy, rapidly gaining ground as a supplement and alternative to the nonrenewable energy feedstock. Actually, an increasing interest is involved in the development of efficient materials as the core of photocatalytic and photothermal processes, allowing solar energy harvesting and conversion for many technological applications, including hydrogen production, CO2 reduction, pollutants degradation, as well as organic syntheses. Particularly, photosensitive nanostructured hybrid materials synthesized coupling inorganic semiconductors with organic compounds, and polymers or carbon-based materials are attracting ever-growing research attention since their peculiar properties overcome several limitations of photocatalytic semiconductors through different approaches, including dye or charge transfer complex sensitization and heterostructures formation. The aim of this review was to describe the most promising recent advances in the field of hybrid nanostructured materials for sunlight capture and solar energy exploitation by photocatalytic processes. Beside diverse materials based on metal oxide semiconductors, emerging photoactive systems, such as metal-organic frameworks (MOFs) and hybrid perovskites, were discussed. Finally, future research opportunities and challenges associated with the design and development of highly efficient and cost-effective photosensitive nanomaterials for technological claims were outlined.

show abstract

“…Some of the greatest global pollutants are diverse organic dyes. Thus, nowadays, major efforts have been focused on developing low-cost and eco-friendly photocatalysts [1][2][3][4][5][6][7][8]. However, conventional photocatalysts (e.g., TiO 2 and ZnO) suffer from low photocatalytic efficiency under solar (UVA/Vis) [1] irradiation (e.g., TiO 2 bandgap is between 2.86 and 3.20 eV [9]), which is a problem that needs to be resolved (see Scheme 1).…”

Section: Introductionmentioning

confidence: 99%

The Impact of In Situ Polymerization Conditions on the Structures and Properties of PANI/ZnO-Based Multiphase Composite Photocatalysts

et al. 2020

View full text Add to dashboard Cite

We have synthesized polyaniline/ZnO-based (PANI/ZnO) multiphase composite photocatalysts from acid media by a newly proposed two-step in situ polymerization. The first step of synthesis yielded PANI salt required for the PANI/ZnO synergistic effect. In the second step, the aniline oxidation continued, without ZnO dissolution, and it produced PANI base. Thus, both PANI salt and base phases in the composites were detected by FTIR and UV/Vis, while the presence of both ZnO and PANI polymer was confirmed by XRD. Additionally, XRD also showed Zn5(OH)8(NO3)2·2H2O and Zn(SO4)(H2O) phases in PANI/ZnO-based multiphase composites. Furthermore, the impact of the synthesis conditions on the morphology of the composites was investigated by FE-SEM. The images displayed that ZnO particles were encapsulated in PANI sheets that were formed by the aniline oligomers. Photocatalytic evaluation of PANI/ZnO-based catalysts (i.e., degradation of Acid Blue 25 dye) was conducted and the obtained results confirmed that all the studied composites experienced the PANI/ZnO synergistic effect. It was observed that the best photocatalytic properties were held by the PANI/ZnO_2 sample due to its optimal particle size.

show abstract

Visible-Light-Active TiO2-Based Hybrid Nanocatalysts for Environmental Applications

Cited by 100 publications

References 162 publications

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

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

Photosensitive Hybrid Nanostructured Materials: The Big Challenges for Sunlight Capture

The Impact of In Situ Polymerization Conditions on the Structures and Properties of PANI/ZnO-Based Multiphase Composite Photocatalysts

Contact Info

Product

Resources

About