Synergic effect of polyaniline and ZnO to enhance the photocatalytic activity of their nanocomposite

Sahu, Keya; Rahamn, Kazi Hasibur; Kar, Asit Kumar

doi:10.1088/2053-1591/ab2c5f

Cited by 21 publications

(14 citation statements)

References 46 publications

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“…For example, a large portion of the conductive polymers-based hybrid photocatalysts has been prepared by using polyaniline (PANI), highly considered for its high conductivity, simple preparation, and reasonable stability [280,281]. PANI has been combined with many semiconductor metal oxides, such as TiO 2 [282,283], ZnO [284][285][286], ZrO 2 [287], CoFe 2 O 4 [288], or SnO 2 [289] to prepare the composite photocatalysts developed to address the issue of water contamination by different monoand multivalent heavy metal ions in recent years. A schematic illustration of the action mechanism of ZnO/PANI is represented in Figure 17.…”

Section: Conductive Polymers-based Hybrid Nanomaterialsmentioning

confidence: 99%

Photosensitive Hybrid Nanostructured Materials: The Big Challenges for Sunlight Capture

2020

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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.

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Section: Conductive Polymers-based Hybrid Nanomaterialsmentioning

confidence: 99%

Photosensitive Hybrid Nanostructured Materials: The Big Challenges for Sunlight Capture

2020

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“…The presence of PANI salt is of the utmost importance for the PANI/ZnO synergistic effect, which enhances composites' photocatalytic activity (Scheme 1). Table 2) was computed by using both the four-point method and Equations (3) and (4). It follows that the conductivity of the pure ZnO sample is the lowest one (2.955 10 −7 S cm −1 ), whereas the PANI/ZnO sample's conductivity (≈ 2.5 10 −5 S cm −1 ) is larger by two orders of magnitude due to the presence of the conductive PANI salt (Table 2).…”

Section: Uv/vis Analysismentioning

confidence: 99%

“…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%

“…PANI/ZnO samples conductivity (Table 2)was computed by using both the four-point method and Equations (3) and(4). It follows that the conductivity of the pure ZnO sample is the lowest one (2.955 10 −7 S cm −1 ), whereas the PANI/ZnO sample's conductivity (≈ 2.5 10 −5 S cm −1 ) is larger by two UV/VIS reflectance spectra of the PANI/ZnO photocatalysts.…”

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

et al. 2020

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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.

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“…The peaks observed in the PAn/ZnO nanocomposite FTIR spectrum are the same with the PAn spectrum (Figure 1). However, by adding ZnO nanoparticles, the peaks corresponding to the PAn shifted to lower wavelengths[35][36][37]. Absorption bands of the PAn/ZnO polymeric composite are determined as the N-H stretching at 3401 cm −1 , C = N stretching mode of quinoid rings at 1577 cm −1 , C = C stretching mode of benzenoid rings at 1473 cm −1 , C-N stretching mode of benzenoid rings at 1290 cm −1 , C-H and C = C stretching mode of aromatic rings at 1108 cm −1 , the quinoid unit of PAn at 1039 cm −1 , plane bending vibration of C-H and C-C…”

mentioning

confidence: 99%

Investigation of the effect of PAn and PAn/ZnO photocatalysts on 100% degradation of Congo red under UV visible light irradiation and lightless environment

Zor¹,

Budak²

2020

Turk J Chem

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PAn (polyaniline) and PAn/ZnO photocatalysts were synthesized using chemical polymerization of aniline. The structure characterization of the synthesized samples was analysed by using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV-Vis spectroscopy measurements, and thermal gravimetric analysis (TGA). The photocatalytic activities of PAn and PAn/ZnO (0.1g/100ml) on the degradation of the Congo red (CR) dye were studied under the UV visible light irradiation and the lightless environment and the efficiency of catalysts have been explained in details. Contribution of UV visible light irradiation on the 100% degradation of CR dye for the PAn and PAn/ZnO photocatalyst is determined. The reaction kinetics and effect of pH (pH 4 and pH 10) were investigated by using first order kinetic model. According to the experimental results, photocatalytic reaction rate of Congo Red increased in acidic environment and under UV visible light irradiation.

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Synergic effect of polyaniline and ZnO to enhance the photocatalytic activity of their nanocomposite

Cited by 21 publications

References 46 publications

Photosensitive Hybrid Nanostructured Materials: The Big Challenges for Sunlight Capture

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

Investigation of the effect of PAn and PAn/ZnO photocatalysts on 100% degradation of Congo red under UV visible light irradiation and lightless environment

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