Efficient photo-catalytic oxidative degradation of organic dyes using CuInSe2/TiO2 hybrid hetero-nanostructures

Kshirsagar, Anuraj S.; Gautam, Aashish; Khanna, Pawan K.

doi:10.1016/j.jphotochem.2017.08.058

Cited by 20 publications

(6 citation statements)

References 89 publications

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“…Initially, the oxidation of the sulfur to sulfone, hydroxylation of phenyl rings, and N-methyl groups of MB leads to the products with m/z 396 and m/z 354. The possibility of being attacked by active •OH to form sulfone has been confirmed by researchers [49]. Then, the photogenerated holes, hydroxyl radicals, and hydroperoxide radicals formed during photodegradation preferentially attack the chromophore center of the dye molecule.…”

Section: Antibacterial Performancementioning

confidence: 85%

Fabrication and investigation on Ag nanowires/TiO2 nanosheets/graphene hybrid nanocomposite and its water treatment performance

Liu

Yang

Dong

et al. 2020

Adv Compos Hybrid Mater

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In this paper, a novel Ag nanowires/TiO 2 nanosheets/graphene nanocomposite was fabricated via a facile method of hydrothermal and calcination, and then the water treatment performance of it was evaluated for methylene blue (MB) and Escherichia coli removal. The as-prepared Ag nanowires/TiO 2 nanosheets/graphene nanocomposite was characterized by Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), UV-visible diffuse reflection spectroscopy (DRS), molecular dynamics simulation, and gas chromatography-mass spectrometry (GC-MS). All data revealed that the Ag/ TiO 2 /graphene nanocomposite showed a rich cell structure. The photocatalytic activity of Ag/TiO 2 /graphene nanocomposite is higher than those of pristine TiO 2 nanosheets and TiO 2 /graphene nanocomposite. Under optimized conditions, the degradation efficiency was 100% and 71% for MB (30 mg/L) and with 10 mg Ag/TiO 2 /graphene nanocomposite under UV and visible light irradiation for 2 h, respectively. Ag/TiO 2 /graphene also showed excellent bacteria-killing activity. Meanwhile, the Ag/TiO 2 / graphene nanocomposite exhibited microstructure stability and cyclic stability. The water treatment performance was enhanced mainly attributed to the excellent adsorption performance of graphene and the high efficiency in separation of electron-hole pairs induced by the remarkable synergistic effects of TiO 2 , Ag, and graphene. On the basis of the experimental results, the photocatalytic mechanism and MB degradation mechanism were proposed. It is hoped that our work could avert the misleading message to the readership, hence offering a valuable source of reference on fabricating composite photocatalyst with stable microstructure and excellent performance for their application in the environment clean-up.

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Section: Antibacterial Performancementioning

confidence: 85%

Fabrication and investigation on Ag nanowires/TiO2 nanosheets/graphene hybrid nanocomposite and its water treatment performance

Liu

Yang

Dong

et al. 2020

Adv Compos Hybrid Mater

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“…In the first reaction, sulfur is oxidized into sulfone, phenyl rings are hydroxylated, and MB is N -methylated. There is a possibility of being attacked by active OH . When the dye molecule is photodegraded, the photogenerated holes and hydroxyl radicals preferentially attack the chromophore center.…”

Section: Results and Discussionmentioning

confidence: 99%

“…When the dye molecule is photodegraded, the photogenerated holes and hydroxyl radicals preferentially attack the chromophore center. As a result of the amino group cleavage, hydrogen radical saturation, demethylation cleavage, release of one or more methyl group substituents on the amine groups, and further oxidation, products with m / z = 230, 135, and 81 are formed. − H 2 O and CO 2 are easily formed by oxidizing CN and C–S bonds in MB. − Figure shows the proposed pathway of degradation of MB by using AA as an organo-photooxidative compound based on GC-MS supported by HPLC.…”

Section: Results and Discussionmentioning

confidence: 99%

Green Organo-Photooxidative Method for the Degradation of Methylene Blue Dye

Majeed,

Ibrahim,

Al-Rawi

et al. 2024

ACS Omega

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This study used an organophoto-oxidative material to degrade the toxic azo dye, methylene blue (MB), due to its hazardous effects on aquatic life and humans. MB is traditionally degraded using metal-based catalysts, resulting in high costs. Several organic acids were screened for organo-photooxidative applications against various azo dyes, and ascorbic acid (AA), also known as vitamin C, was found to be best for degradation due to its high photooxidative activity. It is an eco-friendly, edible, and efficient photooxidative material. A photocatalytic box has been developed for the study of organo-photooxidative activity. It was found that when AA was added, degradation efficiency increased from 42 to 95% within 240 min. Different characterization techniques, such as HPLC and GC-MS, were used after degradation for the structural elucidation of degraded products. DFT study was done for the investigation of the mechanistic study behind the degradation process. A statistical tool, RSM, was used for the optimization of parameters (concentration of dye, catalyst, and time). This study develops sustainable and effective solutions for wastewater treatment.

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“…They are assigned to Ti 4+ valence state in TiO 2 . 60 The high resolution XPS spectrum of tungsten W 4f ( Fig. 6c ) was deconvoluted into four peaks.…”

Section: Resultsmentioning

confidence: 99%

Enhanced photocatalytic performance of WON@porous TiO₂ nanofibers towards sunlight-assisted degradation of organic contaminants

et al. 2018

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In the last few decades, TiO 2 has been widely used in different types of photocatalytic applications.However, the relatively large optical band gap ($3.2 eV), low charge carrier mobility and consequently its low quantum efficiency limit its photocatalytic activity. Herein, we construct a novel nanostructured heterojunction of WON/TiO 2 nanofibers (NFs) by integration of TiO 2 nanofibers synthesized by electrospinning of a polymer solution containing a titanium(IV) butoxide precursor with WON nanoparticles fabricated via annealing of a WO 3 precursor in dry ammonia at 700 C. The synthesized photocatalysts were characterized using different spectroscopic techniques. Their photocatalytic performance towards the degradation of methyl orange, methylene blue, and phenol as model contaminants was investigated and the charge transfer process was elucidated and compared to that of a TiO 2 /WO 3 heterojunction. Scheme 1 Charge transfer through (a) TiO 2 /WO 3 heterojunction (b) TiO 2 /WON heterojunction.This journal is

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Efficient photo-catalytic oxidative degradation of organic dyes using CuInSe2/TiO2 hybrid hetero-nanostructures

Cited by 20 publications

References 89 publications

Fabrication and investigation on Ag nanowires/TiO2 nanosheets/graphene hybrid nanocomposite and its water treatment performance

Fabrication and investigation on Ag nanowires/TiO2 nanosheets/graphene hybrid nanocomposite and its water treatment performance

Green Organo-Photooxidative Method for the Degradation of Methylene Blue Dye

Enhanced photocatalytic performance of WON@porous TiO₂ nanofibers towards sunlight-assisted degradation of organic contaminants

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Efficient photo-catalytic oxidative degradation of organic dyes using CuInSe2/TiO2 hybrid hetero-nanostructures

Cited by 20 publications

References 89 publications

Fabrication and investigation on Ag nanowires/TiO2 nanosheets/graphene hybrid nanocomposite and its water treatment performance

Fabrication and investigation on Ag nanowires/TiO2 nanosheets/graphene hybrid nanocomposite and its water treatment performance

Green Organo-Photooxidative Method for the Degradation of Methylene Blue Dye

Enhanced photocatalytic performance of WON@porous TiO2 nanofibers towards sunlight-assisted degradation of organic contaminants

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Product

Resources

About

Enhanced photocatalytic performance of WON@porous TiO₂ nanofibers towards sunlight-assisted degradation of organic contaminants