Carbon Quantum Dots/Bi<sub>2</sub>WO<sub>6</sub> Composites for Efficient Photocatalytic Pollutant Degradation and Hydrogen Evolution

Zhang, Zhijie; Zheng, Tingting; Xu, Jiayue; Zeng, Haibo; Zhang, Na

doi:10.1142/s1793292017500825

Cited by 22 publications

(6 citation statements)

References 37 publications

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“…It was shown that the CDs/monolayered-Bi 2 WO 6 composite with 3 wt.% CDs had the highest photocatalytic activity for both MO and BPA dyes, with the degradation efficiency about 2-fold and 3-fold higher than that of the pristine m-Bi 2 WO 6 , for MO and BPA respectively. Similar trend of degradation was also exhibited in the N-CDs/Bi 2 WO 6 [101], CDs/Bi 2 WO 6 nanocomposites [102] and visible-light-driven CDs/Bi 2 WO 6 hybrid materials [103]. Figure 5 presents the possible photocatalytic reaction mechanism of N-CDs/Bi 2 WO 6 .…”

Section: Photocatalysis Applications Of Cdssupporting

confidence: 63%

Recent Progress of Carbon Dot Precursors and Photocatalysis Applications

et al. 2019

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Carbon dots (CDs), a class of carbon-based sub-ten-nanometer nanoparticles, have attracted great attention since their discovery fifteen years ago. Because of the outstanding photoluminescence properties, photostability, low toxicity, and low cost, CDs have potential to replace traditional semiconductor quantum dots which have serious drawbacks of toxicity and high cost. This review covers the common top-down and bottom-up methods for the synthesis of CDs, different categories of CD precursors (small molecules, natural polymers, and synthetic polymers), one-pot and multi-step methods to produce CDs/photocatalyst composites, and recent advances of CDs on photocatalysis applications mostly in pollutant degradation and energy areas. A broad range of precursors forming fluorescent CDs are discussed, including small molecule sole or dual precursors, natural polymers such as pure polysaccharides and proteins and crude bio-resources from plants or animals, and various synthetic polymer precursors with positive, negative, neutral and hydrophilic, hydrophobic, or zwitterionic feature. Because of the wide light absorbance, excellent photoluminescence properties and electron transfer ability, CDs have emerged as a new type of photocatalyst. Recent work of CDs as sole photocatalyst or in combination with other materials (e.g., metal, metal sulfide, metal oxide, bismuth-based semiconductor, or other traditional photocatalysts) to form composite catalyst for various photocatalytic applications are reviewed. Possible future directions are proposed at the end of the article on mechanistic studies, production of CDs with better controlled properties, expansion of polymer precursor pool, and systematic studies of CDs for photocatalysis applications.

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Section: Photocatalysis Applications Of Cdssupporting

confidence: 63%

Recent Progress of Carbon Dot Precursors and Photocatalysis Applications

et al. 2019

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“…For instance, Kang, et al [27] reported that CQDs can be used as spectrum converters in photoelectro-chemical hydrogen generation systems due to their up-conversion luminescence property. In a previous report [28] , we also found that the upconversion emission from CQDs can excite Bi 2 WO 6 to produce photo-induced charge carriers, thus increasing the availability of sunlight. When CQDs are introduced into the composite system, a portion of visible light is transformed into ultraviolet light.…”

Section: Mechanism Of the Enhanced Photo-activitymentioning

confidence: 57%

Pollutant Degradation

Zhang¹,

Huang²,

Cheng³

et al. 2019

Journal of Inorganic Materials

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To overcome the limitation of narrow photo-absorption range and high electron-hole recombination rate of pure BiOCl, a nanocomposite of carbon quantum dots (CQDs) and BiOCl with highly efficient photocatalytic activity was fabricated. The photocatalytic decomposition of rhodamine B (RhB) showed that the CQDs/BiOCl nanocomposite displayed superior photocatalytic performance to pure BiOCl, which was about 3.4 times higher than that of the latter. The optimal loading amount of CQDs was 7.1wt%, which could completely decolorize RhB within a short period of only 2 min, while the degradation rate of RhB was only 29.5% by pure BiOCl in the same period. UV-Vis diffuse reflectance spectra (UV-Vis DRS), photoelectrochemical measurement, and radicals trapping experiments were performed to elucidate the possible mechanism for the enhanced photocatalytic activity of the CQDs/BiOCl composite. The results show that CQD can expand the visible light absorption range of BiOCl, which is beneficial for light harvesting and generation of electron-hole pairs. Moreover, CQDs has unique up-converted photoluminescence behavior, as well as photo-induced electron transfer ability, which leads to enhanced photocatalytic performance of the CQDs/BiOCl composite.

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“…The composite photocatalyst CDs/Bi 2 WO 6 was prepared by Zhang et al. [ 61 ] Under simulated solar irradiation, 3 wt% CDs/Bi 2 WO 6 could degrade 97.0% of RhB after 10 min, while CDs/Bi 2 WO 6 could degrade 33.4% of phenol after 120 min of irradiation. This is because the photo‐induced electron transfer properties of CDs can transfer electrons from the Bi 2 WO 6 network, as shown in Figure , and then the O 2 adsorbed on the CDs will react with the electrons to degrade the organics.…”

Section: Photocatalytic Materials Based On Cdsmentioning

confidence: 99%

Introduction to the Performance and Mechanism of Various Photocatalytic Materials Compounded with Carbon Dots

Yan

Wang

Zang

et al. 2021

Part & Part Syst Charact

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extensive research in the fields of drug delivery, chemical sensing, bioimaging, and specifically catalysis. [7][8][9] For instance, Liu's group has prepared CDs-confined CoP-CoO nanoheterostructure, Ru@CDs, RuM/CDs (M = Ni, Mn, Cu), and RuCo/ CDs catalysts with excellent catalytic performance, which can be widely used for electrolysis of hydrogen. [10][11][12][13] Catalysis, especially photocatalysis, is a topic that has received a lot of attention recently. Conventional photocatalysts include titanium dioxide, zinc oxide, and cadmium sulfide and many other oxide sulfide semiconductors, but these catalysts are basically limited in their use by low light utilization and high lightinduced electron-hole complexation rates. [14,15] As functional nanomaterials with excellent optical and electronic properties such as efficient light harvesting, extraordinary UCPL, and excellent photoinduced electron transfer, CDs combined with photocatalysts can broaden the photoresponsive region and improve the separation ratio of photoinduced carriers. [16,17] CDs are therefore considered to be an effective component for the construction of high-performance photocatalysts, and this area has been extensively investigated by researchers. CDs/Bi 2 MoO 6 composite photocatalysts were prepared by Samanta et al. [18] CDs led to an increase in catalyst light absorption and carrier separation efficiency. Zha et al. [19] synthesized a photocatalyst CDs/BiOCl using Chlorella vulgaris as a carbon source for CDs (CBOC). The introduced CDs broadened the response range of the spectrum, promoted the separation of electron-hole pairs, and enhanced the photocatalytic efficiency.The photocatalytic mechanism of CDs can be the photoexcitation and charge separation of the core carbon. [20] In general, the photocatalytic process based on CDs is divided into the following three processes. First, the absorption of light leads to the generation of electron-hole pairs. Second, the separation and transfer of electron-hole pairs create prerequisites for the reaction. Finally, a redox reaction takes place on the photocatalytic surface. [21] The main factors limiting the photocatalytic process are light absorption and the rate of electron-hole pair complexation, and many approaches have been taken to alleviate these problems.In view of the excellent performance of CDs in photocatalysis, previous reviews have summarized the approaches to improve the photocatalytic efficiency of CDs and the applications of CDs-based photocatalytic materials. [22][23][24][25][26] However, this thesis provides a review of the recent literature in this With their unique optical and electronic properties, carbon dots (CDs) are showing great momentum in many fields such as biosensing, imaging, drug delivery, and photocatalysis. Due to their efficient light harvesting, extraordinary upconversion photoluminescence, and excellent photoinduced electron transfer capabilities, the combination of CDs with photocatalytic materials will promote light absorption resulting in increased generation...

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Carbon Quantum Dots/Bi₂WO₆ Composites for Efficient Photocatalytic Pollutant Degradation and Hydrogen Evolution

Cited by 22 publications

References 37 publications

Recent Progress of Carbon Dot Precursors and Photocatalysis Applications

Recent Progress of Carbon Dot Precursors and Photocatalysis Applications

Pollutant Degradation

Introduction to the Performance and Mechanism of Various Photocatalytic Materials Compounded with Carbon Dots

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Carbon Quantum Dots/Bi2WO6 Composites for Efficient Photocatalytic Pollutant Degradation and Hydrogen Evolution

Cited by 22 publications

References 37 publications

Recent Progress of Carbon Dot Precursors and Photocatalysis Applications

Recent Progress of Carbon Dot Precursors and Photocatalysis Applications

Pollutant Degradation

Introduction to the Performance and Mechanism of Various Photocatalytic Materials Compounded with Carbon Dots

Contact Info

Product

Resources

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Carbon Quantum Dots/Bi₂WO₆ Composites for Efficient Photocatalytic Pollutant Degradation and Hydrogen Evolution