Comparative studies of the photocatalytic and microwave –assisted degradation of alizarin red using ZnO/poly(1- naphthylamine) nanohybrids

Riaz, Ufana; Ashraf, S. M.; Budhiraja, Vaibhav; Aleem, Sadaf; Kashyap, Jyoti

doi:10.1016/j.molliq.2016.01.018

Cited by 38 publications

(39 citation statements)

References 34 publications

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“…Holes on the material surface can promote reactive oxidants as hydroxyl radicals, and the most reduction processes (O 2 reduction to superoxides radicals, H 2 generation, chromium (VI) reduction) can be initiated by electrons photo-generated. The increase in oxygen vacancies in MAH samples is closely related to the higher surface hydroxylation promoted by microwave synthesis method [86] ( Figure S2 and S3) Figure 7B shows the photocatalytic activity of ZnO samples obtained by MPP and MAH methods for RhB degradation under visible illumination. Similar to UV illumination ( Figure 7A), MAH nanorods particles evidently display better RhB discoloration compared with MPP nanoplates samples.…”

Section: Consequently [As] Is Incorporated Into Kinetic Rate (K) Thmentioning

confidence: 90%

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

et al. 2017

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Photocatalytic materials can perform oxidative and reductive reactions over their surfaces when excited with light. Intrinsic characteristics of the material such as superficial area, morphological structure, and crystalline phase exposition play a fundamental role in the corresponding reaction paths. However, especially in doped semiconductors, as ZnO:N, less is known about how the synthesis parameters affect the morphologies and the photocatalytic activity simultaneously. To solve this issue, ZnO and ZnO:N samples were obtained using microwave-assisted hydrothermal and modified polymeric precursor methods of synthesis. Samples morphologies were characterized by TEM and FE-SEM. Crystallographic phases were observed by XRD and optical characteristics by DRS. XPS results confirmed the doping process. Degradation of Rhodamine-B and Cr(VI) reduction were employed as probe reactions to investigate their photocatalytic activity. Although the crystallographic structure of these powders maintains the ZnO hexagonal wurtzite structure, the optical properties and morphologies, and photocatalytic activities present different behaviors. Also, density functional theory calculations were employed to determine the specific features related to electronic structure, morphology, and photocatalytic activity.Different synthesis methods produce a singular behavior in the physicochemical properties of materials, and the doping effect produces various modifications in RhB degradation and Cr(VI) reduction for each synthesis method. Crystal face exposition and morphologies are related to the improvement in the photocatalytic activity of the materials.

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Section: Consequently [As] Is Incorporated Into Kinetic Rate (K) Thmentioning

confidence: 90%

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

et al. 2017

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“…‐ Conducting polymers such as polyaniline (PANI), polypyrrole (Ppy), polythiophene (PTh), poly(1‐naphthylamine) (PNA), poly(o‐toluidine) (POT), polycarbazole (PCz) are well investigated for their excellent photo‐physical, photo‐chemical, electrochemical and structural properties. When combined with semiconductor nanoparticles, they act as charge reservoirs and prevent the recombination of photogenerated electron/hole pairs …”

Section: Introductionmentioning

confidence: 99%

Synergistic Performance of Sonolytically Synthesized Poly(1‐naphthylamine)/TiO₂ Nanohybrids: Degradation Studies of Amido Black‐10B Dye

et al. 2018

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The present work reports the synthesis, characterization and sonophotocatalytic studies of poly(1-naphthylamine) (PNA)/ TiO 2 nanohybrids using different loadings of the conducting polymer. Raman and IR studies confirmed the interaction between PNA and TiO 2 . UV studies showed that the band gap of PNA: TiO 2 nanohybrids were found to be ranging between 1.67 eV À 1.9 eV. The thermal stability was found to follow the order: 0.5:1-PNA: TiO 2 > 1:1-PNA:TiO 2 > 2:1-PNA:TiO 2 > PNA. Photocatalytic activity of the nanohybrids was tested by degrading Amido Black 10B dye under UV irradiation. A remarkable degradation of 90% was achieved within a short period of 60 min. The degraded fragments were investigated by LCMS studies and a plausible degradation mechanism was proposed.

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“…In addition to that on incorporation of metallic nanoparticles, interfacial and coordinate interaction between the conjugated chain of PNA and silver is expected to modify the polymer chain reorganization. According to earlier reports, peaks around 2θ =5.8°,9.1°,14.5°, 17.1°, and 23.5° can be correlated to the (020), (010), (200), (100), and (011) planes of the pseudo‐orthorhombic lattice of PNA . Therefore, the low angle peaks present in the PNA‐Ag nanocomposites are attributed to the formation of crystalline PNA micro domains as proposed by Riaz et al …”

Section: Resultsmentioning

confidence: 64%

“…The crystalline nature of PNA and PNA‐Ag nanocomposites is studied using XRD studies (Figure ). The PNA prepared is found to be amorphous, which is evidenced by the broad hump centered at 2θ =12° due to reflection from (200) plane of the polymer . However, in XRD spectra of PNA‐Ag nanocomposites, a difference in number, position, and intensity of peaks was observed.…”

Section: Resultsmentioning

confidence: 98%

“…However, in XRD spectra of PNA‐Ag nanocomposites, a difference in number, position, and intensity of peaks was observed. Presence of additional reflections in the 2θ region 6–25° on the XRD spectra of PNA‐Ag nanocomposites indicates that crystallinity and orientation of PNA chains are affected by AgNPs incorporation . Here pristine PNA is prepared by polymerization of NA using APS alone, while during the nanocomposite preparation polymerization is done in the presence of mixed oxidants say AgNO 3 and APS, which may influence the crystallinity, orientation, and chain length of PNA and hence it will be reflected in their XRD patterns.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of novel poly(1‐naphthylamine)‐silver nanocomposites and its catalytic studies on reduction of 4‐nitrophenol and methylene blue

Saidu

Joseph²,

Thomas³

2019

J of Applied Polymer Sci

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A novel poly(1‐naphthylamine)‐silver (PNA‐Ag) nanocomposite has been prepared and used as a heterogeneous catalyst for the reduction of 4‐nitrophenol (4‐NP) and methylene blue (MB). In this study, silver nanoparticles (AgNPs) have been incorporated to PNA via a simple and fast one‐step route, where PNA acts as the reductant for silver ions and stabilizer for AgNPs. The prepared PNA‐Ag nanocomposites were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X‐ray diffraction (XRD), thermogravimetric analysis (TGA), energy dispersive X‐ray scattering (EDAX), and Fourier transform infrared (FTIR) spectroscopy. They provided ample evidence for the anchoring of AgNPs to the PNA chains. Enhanced electrochemical performance of the PNA‐Ag nanocomposite has been evidenced by cyclic voltammetry studies. Catalytic studies confirmed that the rate of reduction of both 4‐NP and MB with sodium borohydride have been enhanced significantly in the presence of AgNPs loaded PNA in comparison to neat PNA. This nanocomposite could find application as catalyst for reductive degradation of toxic organic pollutants. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48318.

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Comparative studies of the photocatalytic and microwave –assisted degradation of alizarin red using ZnO/poly(1- naphthylamine) nanohybrids

Cited by 38 publications

References 34 publications

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

Synergistic Performance of Sonolytically Synthesized Poly(1‐naphthylamine)/TiO₂ Nanohybrids: Degradation Studies of Amido Black‐10B Dye

Synthesis of novel poly(1‐naphthylamine)‐silver nanocomposites and its catalytic studies on reduction of 4‐nitrophenol and methylene blue

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Comparative studies of the photocatalytic and microwave –assisted degradation of alizarin red using ZnO/poly(1- naphthylamine) nanohybrids

Cited by 38 publications

References 34 publications

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

The interplay between morphology and photocatalytic activity in ZnO and N-doped ZnO crystals

Synergistic Performance of Sonolytically Synthesized Poly(1‐naphthylamine)/TiO2 Nanohybrids: Degradation Studies of Amido Black‐10B Dye

Synthesis of novel poly(1‐naphthylamine)‐silver nanocomposites and its catalytic studies on reduction of 4‐nitrophenol and methylene blue

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Synergistic Performance of Sonolytically Synthesized Poly(1‐naphthylamine)/TiO₂ Nanohybrids: Degradation Studies of Amido Black‐10B Dye