Application of graphene quantum dots as green homogenous nanophotocatalyst in the visible-light-driven photolytic process

Roushani, Mahmoud; Mavaei, Maryamosadat; Daneshfar, Ali; Rajabi, Hamid Reza

doi:10.1007/s10854-016-6169-7

Cited by 20 publications

(7 citation statements)

References 52 publications

(62 reference statements)

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“…The GQDs were prepared by thermal polymerization of citric acid (CA) with some adjustment 44,55 . 2.0 g CA was thermally treated at 200 C for 30 min in a 50 mL flask, until it turned dark orange.…”

Section: Experimental Section 21 Synthesis Of Flexible Photocatalystsmentioning

confidence: 99%

“…In fact, graphene quantum dots (GQDs) can also act as the co-catalyst in constructing S-scheme heterojunctions. Unlike graphene and graphene oxide, GQDs possess a finite band gap because of the quantum confinement effect [42][43][44] . Therefore, GQDs can act as a semiconductor in a composite [44][45][46][47] .…”

Section: Introductionmentioning

confidence: 99%

“…In a bottom-up way, GQDs were formed through the polycondensation of small organic molecular, such as methylbenzene, hexabromobenzene, citric acid, and 1,3,6-trinitropyrene. Among these methods, the polycondensation of citric acid is a more desirable way for its safety, low cost, and convenience 44,[51][52][53][54] .…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of Graphene Quantum Dots Modified BiOI/PAN Flexible Fiber with Enhanced Photocatalytic Activity

He¹,

Chen²,

Luo³

et al. 2020

Acta Physico Chimica Sinica

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In environment remediation, photocatalytic oxidation is a promising technique for removing organic pollutants. Compared to adsorption, biodegradation, and chemical oxidation, photocatalytic oxidation can eliminate organic pollutants completely, conveniently, and cheaply in an environmentally friendly manner. Visible-light-driven photocatalytic oxidation is particularly advisable because of the high proportion of visible light energy in solar energy. Bismuth oxyiodide (BiOI) is a promising visible-light-driven photocatalyst for the oxidization of pollutants, not only because of its narrow band gap, but also for its relatively low valence band (VB), which is adequate for photogenerated holes to oxidize a variety of organic compounds. However, the shortcomings of BiOI powder, such the difficulty of recycling it, its low surface area, and fast carrier recombination, limit its practical applications. Meanwhile, the flexibility and hierarchical structure of photocatalysts are particularly advisable because these properties are beneficial for the convenient operation, recycling, and performance improvement of these materials. Herein, based on an electro-spun polyacrylonitrile (PAN) nanofiber substrate, a hierarchical BiOI/PAN fiber was prepared through an in situ reaction. In the as-prepared BiOI/PAN fibers, BiOI flakes were aligned vertically and uniformly around the PAN fibers. BiOI nuclei generated from preintroduced Bi(III) in the PAN fiber act as seeds for the growth of BiOI nanoplates, which is crucial for the formation of a hierarchical structure. Such a hierarchical structure can improve both the light absorption and carrier generation of the BiOI/PAN fibers, as demonstrated by UV-Vis diffuse reflectance spectra and photoluminescence emission. Therefore, the BiOI/PAN fibers exhibited higher photocatalytic activity than BiOI powder. When the BiOI/PAN fibers were decorated with pre-prepared graphene quantum dots (GQDs), a GQD-modified BiOI/PAN fibrous composite (GQD-BiOI/PAN) was fabricated. The morphology of the obtained GQD-BiOI/PAN fibers was nearly the same as that of the BiOI/PAN fibers. A step-scheme (S-scheme) heterojunction was formed between the GQDs and BiOI, which was confirmed by the fabrication method, photoluminescence emission, reactive radical tests, and XPS analysis. This kind of S-scheme heterojunction can not only effectively suppress the recombination of photogenerated holes, but can also reserve the more reductive electrons on the lowest unoccupied molecular orbital of GQDs and the more oxidative holes on the VB of BiOI, for the photocatalytic degradation of phenol. Because of the fibrous hierarchical structure and S-scheme heterojunction, GQD-BiOI/PAN outperformed BiOI nanoparticles and BiOI/PAN nanofibers in the photocatalytic oxidation of phenol under visible light. In addition, because of tight bonding, GQD-BiOI/PAN can be tailored and operated by hand, which is convenient for recycling. During recycling, no obvious loss of sample or decrease in photocatalytic activity was observed. This w...

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Section: Experimental Section 21 Synthesis Of Flexible Photocatalystsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fabrication of Graphene Quantum Dots Modified BiOI/PAN Flexible Fiber with Enhanced Photocatalytic Activity

He¹,

Chen²,

Luo³

et al. 2020

Acta Physico Chimica Sinica

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“…Mixed elements can bring many functions in carbon point synthesis, such as serving as photocatalyst, 35,36 enhancing flux recovery ratios, 37 removing organic dye, 38 detecting dopamine, 39 optimizing fuel cell applications 40 and so on.…”

Section: Resultsmentioning

confidence: 99%

Nitrogen-doped cyan-emissive carbon quantum dots for fluorescence tetracycline detection and lysosome imaging

et al. 2022

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“…Hence, an effective treatment that enables the removal or degradation of synthetic dyes present in industrial effluents before discharging the effluents into the environment should be developed urgently for minimizing environmental pollution. To date, various techniques, such as adsorption, coagulation, aerobic oxidation, membrane filtration, chemical precipitation, ozonization, and photocatalysis have been employed for the removal of dyes from industrial wastewater [ 3 , 4 , 5 , 6 , 7 ]. Of these techniques, photocatalysis has emerged as a promising green technique and been widely used for the degradation of dyes because of its easy operation process, low cost, and energy conservation ability.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Properties of Graphene/Gold and Graphene Oxide/Gold Nanocomposites Synthesized by Pulsed Laser Induced Photolysis

et al. 2020

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Graphene (Gr)/gold (Au) and graphene-oxide (GO)/Au nanocomposites (NCPs) were synthesized by performing pulsed-laser-induced photolysis (PLIP) on hydrogen peroxide and chloroauric acid (HAuCl4) that coexisted with Gr or GO in an aqueous solution. A 3-month-long aqueous solution stability was observed in the NCPs synthesized without using surfactants and additional processing. The synthesized NCPs were characterized using absorption spectroscopy, transmission electron microscopy, Raman spectroscopy, energy dispersive spectroscopy, and X-ray diffraction to prove the existence of hybrid Gr/Au or GO/Au NCPs. The synthesized NCPs were further evaluated using the photocatalytic reaction of methylene blue (MB), a synthetic dye, under UV radiation, visible light (central wavelength of 470 nm), and full spectrum of solar light. Both Gr/Au and GO/Au NCPs exhibited photocatalytic degradation of MB under solar light illumination with removal efficiencies of 92.1% and 94.5%, respectively.

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Application of graphene quantum dots as green homogenous nanophotocatalyst in the visible-light-driven photolytic process

Cited by 20 publications

References 52 publications

Fabrication of Graphene Quantum Dots Modified BiOI/PAN Flexible Fiber with Enhanced Photocatalytic Activity

Fabrication of Graphene Quantum Dots Modified BiOI/PAN Flexible Fiber with Enhanced Photocatalytic Activity

Nitrogen-doped cyan-emissive carbon quantum dots for fluorescence tetracycline detection and lysosome imaging

Photocatalytic Properties of Graphene/Gold and Graphene Oxide/Gold Nanocomposites Synthesized by Pulsed Laser Induced Photolysis

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