A review on mechanism, applications and influencing factors of carbon quantum dots based photocatalysis

Gao, Wensu; Zhang, Shurong; Wang, Guiqiao; Cui, Jinzhi; Lu, Yaxin; Rong, Xing; Gao, Canzhu

doi:10.1016/j.ceramint.2022.10.116

Cited by 41 publications

(8 citation statements)

References 128 publications

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“…Metal/non-metal element doping [ 34 , 35 ], construction of heterojunction [ 36 ], and other strategies were used to optimize the photocatalytic performance of g-C 3 N 4 . Carbon quantum dots (CQDs), a “zero-dimensional” nanomaterial, has become one of the most promising co-catalysts due to their excellent electron transfer ability and up-converting photoluminescence [ 37 ]. Therefore, it is a reasonable way to modify g-C 3 N 4 with CQDs to enhance visible light absorption as well as reduce the recombination of photogenerated charges [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of AFB1 Removal Efficiency via Adsorption/Photocatalysis Synergy Using Surface-Modified Electrospun PCL-g-C3N4/CQDs Membranes

et al. 2023

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Aflatoxin B1 (AFB1) is a highly toxic mycotoxin produced by aspergillus species under specific conditions as secondary metabolites. In this study, types of PCL (Polycaprolactone) membranes anchored (or not) to g-C3N4/CQDs composites were prepared using electrospinning technology with (or without) the following surface modification treatment to remove AFB1. These membranes and g-C3N4/CQDs composites were characterized by SEM, TEM, UV-vis, XRD, XPS and FTIR to analyze their physical and chemical properties. Among them, the modified PCL-g-C3N4/CQDs electrospun membranes exhibited an excellent ability to degrade AFB1 via synergistic effects of adsorption and photocatalysis, and the degradation rate of 0.5 μg/mL AFB1 solution was observed to be up to 96.88% in 30 min under visible light irradiation. Moreover, the modified PCL-g-C3N4/CQDs electrospun membranes could be removed directly after the reaction process without centrifugal or magnetic separation, and the regeneration was a green approach synchronized with the reaction under visible light avoiding physical or chemical treatment. The mechanism of adsorption by electrostatic attraction and hydrogen bonding interaction was revealed and the mechanism of photodegradation of AFB1 was also proposed based on active species trapping experiments. This study illuminated the highly synergic adsorption and photocatalytic AFB1 removal efficiency without side effects from the modified PCL-g-C3N4/CQDs electrospun membranes, thereby offering a continual and green solution to AFB1 removal in practical application.

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Section: Introductionmentioning

confidence: 99%

Enhancement of AFB1 Removal Efficiency via Adsorption/Photocatalysis Synergy Using Surface-Modified Electrospun PCL-g-C3N4/CQDs Membranes

et al. 2023

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“…[10] Carbon-based nanomaterials are extensively used as photocatalysts for degrading organic dyes, due to their ease of synthesis routes, low toxicity, and unique electronic and optical properties. [11] In this context, carbon nanoparticles, mainly carbon nanodots (CND), have been of concern widely, which are pointedly associated with small sizes of less than 10 nm. Moreover, their chemical structure consists of an amorphous or nanocrystalline core considering their internal sp 2 and external sp 3 hybridized orbitals with a lattice surface enriched with hydrophilic functionalities such as epoxide, amine, carboxylic, and hydroxyl groups' surface functional groups.…”

Section: Introductionmentioning

confidence: 99%

Parameters Affecting Methylene Blue Dye Photodegradation by Carbon dots Prepared from Olive Pomace

2023

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Olive pomace was used as a precursor in synthesizing CNDs through pyrolysis and oxidation. The photocatalytic activity of CNDs was evaluated for the degradation of methylene blue (M.B). dye under irradiation of a visible light source. The influence of various operational parameters such as the photocatalyst dose, solution pH, the initial concentration of M.B. dye, NaCl salt content, visible light source power, and distance were investigated and their effects on degradation rate and efficiency have been estimated. The photocatalytic mechanism and kinetic reaction were studied to find that ROS is responsible for causing a ‐pseudo‐first‐order photodegradation of the targeted dye. It was found that both rate and efficiency increased linearly with increasing the photocatalyst dose (CNDs) spiked into M.B solution, along with a maximum degradation first‐order rate of 0.061 min−1 obtained at pH=10.6 with an efficiency of 92 % after 120 minutes of light irradiation.

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“…In contemporary society, science faces a lot of questions, one way or another related to the ecological situation of the planet and the gradual depletion of the resources [1][2][3][4][5][6][7][8]. There are rather strict requirements regarding environmental safety for the technologies being developed.…”

Section: Introductionmentioning

confidence: 99%

Studying effects of external conditions of electrochemical measurements on the photoelectrochemical properties of semiconductors: cyclic voltammetry, impedance spectroscopy, and Mott – Schottky method

Markovskaya

Sidorenko

Zhurenok

et al. 2023

EM&T

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In this paper, the dependences of the semiconductors’ photoelectrochemical properties on the experimental conditions were studied for the solid solution of CdS and ZnS, graphitic carbon nitride, and the platinized carbon nitride. The cyclic voltammograms were obtained under different scan rates. The sample investigations were carried out by two ways, at the constant external voltage and varied amplitudes and at different external voltages and the fixed amplitude. The Mott – Schottky dependences were studied at different frequencies. The basic dependences of the changes in the photoelectrode target characteristics on the experimental condition were found. Some recommendations for the correct comparison of qualitative and quantitative photoelectrochemical data were formulated.

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A review on mechanism, applications and influencing factors of carbon quantum dots based photocatalysis

Cited by 41 publications

References 128 publications

Enhancement of AFB1 Removal Efficiency via Adsorption/Photocatalysis Synergy Using Surface-Modified Electrospun PCL-g-C3N4/CQDs Membranes

Enhancement of AFB1 Removal Efficiency via Adsorption/Photocatalysis Synergy Using Surface-Modified Electrospun PCL-g-C3N4/CQDs Membranes

Parameters Affecting Methylene Blue Dye Photodegradation by Carbon dots Prepared from Olive Pomace

Studying effects of external conditions of electrochemical measurements on the photoelectrochemical properties of semiconductors: cyclic voltammetry, impedance spectroscopy, and Mott – Schottky method

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