Size-dependent photocatalytic activity of carbon dots with surface-state determined photoluminescence

Zhou, Yiqun; Zahran, Elsayed M.; Quiroga, Bruno A.; Pérez, Jennifer; Mintz, Keenan J.; Peng, Zhili; Liyanage, Piumi Y.; Pandey, Raja R.; Chusuei, Charles C.

doi:10.1016/j.apcatb.2019.02.019

Cited by 171 publications

(98 citation statements)

References 68 publications

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“…The “top‐down” approach generally uses harsh conditions (i.e., laser ablation, arc discharge, electrochemical exfoliation, and oxidative acid treatment) to breakdown the bulk carbon materials into nano‐sized C‐dots particles. In the “bottom‐up” approach, C‐dots are prepared from the polymerization and carbonization of small carbon‐containing molecules …”

Section: Carbon‐based Nanomaterials For Bone Tissue Engineeringmentioning

confidence: 99%

Bone Tissue Engineering via Carbon‐Based Nanomaterials

Peng

Zhao

Zhou

et al. 2020

Adv Healthcare Materials

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114

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Bone tissue engineering (BTE) has received significant attention due to its enormous potential in treating critical‐sized bone defects and related diseases. Traditional materials such as metals, ceramics, and polymers have been widely applied as BTE scaffolds; however, their clinical applications have been rather limited due to various considerations. Recently, carbon‐based nanomaterials attract significant interests for their applications as BTE scaffolds due to their superior properties, including excellent mechanical strength, large surface area, tunable surface functionalities, high biocompatibility as well as abundant and inexpensive nature. In this article, recent studies and advancements on the use of carbon‐based nanomaterials with different dimensions such as graphene and its derivatives, carbon nanotubes, and carbon dots, for BTE are reviewed. Current challenges of carbon‐based nanomaterials for BTE and future trends in BTE scaffolds development are also highlighted and discussed.

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Section: Carbon‐based Nanomaterials For Bone Tissue Engineeringmentioning

confidence: 99%

Bone Tissue Engineering via Carbon‐Based Nanomaterials

Peng

Zhao

Zhou

et al. 2020

Adv Healthcare Materials

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114

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“…Nevertheless, despite the evidences in favor of a ROS‐mediated mechanism, a possible degradation mechanism based on direct hole transfer from GQD to RhB was investigated, since some studies suggest that holes might directly degrade dye molecules. [ 23,30,48,49 ] In order to do so, PL emission of GQDp and GQDv solutions with different concentrations of RhB was measured, using the excitation wavelength for maximum PL emission of each GQD. It should be noted that PL from RhB, with maximum emission energy at 580 nm, does not contribute to PL intensity measured at the characteristic wavelength of the GQD.…”

Section: Resultsmentioning

confidence: 99%

“…It is worth noting that the complex reaction scheme proposed here comprises both ROS‐mediated and direct charge transfer degradation pathways, both of them previously suggested in other reports for GQD photocatalysts. [ 23,28,30 ]…”

Section: Resultsmentioning

confidence: 99%

“…[ 18,19 ] Interestingly, GQD may exhibit antioxidant (ROS scavenging) or pro‐oxidant (ROS generating) activity in the absence or presence of light, respectively. [ 20 ] Thus, in recent years, a number of studies have reported the photocatalytic activity of GQD for organic dye degradation, [ 21–31 ] and also, for other relevant reactions, such as, water splitting, [ 6,11,32 ] oxidative coupling reactions, [ 33 ] and ring opening reactions. [ 34 ]…”

Section: Introductionmentioning

confidence: 99%

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On the Factors behind the Photocatalytic Activity of Graphene Quantum Dots for Organic Dye Degradation

Ibarbia

Grande

Ruiz

2020

Part & Part Syst Charact

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Graphene quantum dots (GQD) are promising visible‐light photocatalysts for organic dye degradation. Besides having improved visible‐light activity compared with commercial TiO2, GQD are versatile photocatalysts as their chemical composition and, consequently, optical properties can be tuned synthetically, with a direct impact on photoactivity. However, there is a lack of systematic comparative studies to benchmark GQD photocatalytic performance and relate it to their intrinsic properties. This is undertaken in this work for three types of GQD, which are prepared using well‐established synthetic methods representative of top‐down and bottom‐up approaches using different precursors. Resulting GQD are similar in size but differ in chemical composition, crystallinity, bandgap (ranging from 2.63 to 3.63 eV) and visible‐light absorptivity. Photoactivity measurements under comparable experimental conditions (visible‐light illumination) reveal enormous activity differences for rhodamine B (RhB) degradation, with up to tenfold higher degradation yields at the same time for certain GQD types. The enormous influence of intrinsic and tunable GQD factors, like visible‐light absorptivity and surface charge, on their photoactivity for the degradation of organic dyes is demonstrated, highlighting the importance of tailoring such parameters for enhanced photocatalytic performance. A plausible mechanism for GQD‐catalyzed photodegradation of RhB is also proposed.

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“…To realize the efficient degradation of organic dyes, C-dots have to be integrated in metal-based heterostructures [50][51][52][53][54][55][56][57]. Recently, some encouraging reports demonstrated the efficient photocatalytic degradation of organic dyes by C-dots alone [58][59][60][61][62][63][64]; however, various factors including limited light absorption, extra surface doping, and tedious separation significantly limited their practical applications.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

Peng

Zhou

et al. 2020

Nanomaterials

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Carbon dots (C-dots) were facilely fabricated via a hydrothermal method and fully characterized. Our study shows that the as-synthesized C-dots are nontoxic, negatively charged spherical particles (average diameter 4.7 nm) with excellent water dispersion ability. Furthermore, the C-dots have a rich presence of surface functionalities such as hydroxyls and carboxyls as well as amines. The significance of the C-dots as highly efficient photocatalysts for rhodamine B (RhB) and methylene blue (MB) degradation was explored. The C-dots demonstrate excellent photocatalytic activity, achieving 100% of RhB and MB degradation within 170 min. The degradation rate constants for RhB and MB were 1.8 × 10−2 and 2.4 × 10−2 min−1, respectively. The photocatalytic degradation performances of the C-dots are comparable to those metal-based photocatalysts and generally better than previously reported C-dots photocatalysts. Collectively considering the excellent photocatalytic activity toward organic dye degradation, as well as the fact that they are facilely synthesized with no need of further doping, compositing, and tedious purification and separation, the C-dots fabricated in this work are demonstrated to be a promising alternative for pollutant degradation and environment protection.

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Size-dependent photocatalytic activity of carbon dots with surface-state determined photoluminescence

Cited by 171 publications

References 68 publications

Bone Tissue Engineering via Carbon‐Based Nanomaterials

Bone Tissue Engineering via Carbon‐Based Nanomaterials

On the Factors behind the Photocatalytic Activity of Graphene Quantum Dots for Organic Dye Degradation

Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

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