Self-assembled graphitic carbon nitride regulated by carbon quantum dots with optimized electronic band structure for enhanced photocatalytic degradation of diclofenac

You, Qinglun; Zhang, Qianxin; Gu, Mengbin; Du, Roujia; Chen, Ping; Huang, Jun; Wang, Yujue; Deng, Shubo; Yu, Gang

doi:10.1016/j.cej.2021.133927

Cited by 39 publications

(11 citation statements)

References 91 publications

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“…Based on the above results, it is believed that the synthesis of H 2 O 2 on the CB of CACN is mainly through indirect sequential two-step single-electron reduction pathways (O 2 → • O 2 – → H 2 O 2 ) and (O 2 → 1 O 2 → H 2 O 2 ). , On the contrary, the addition of isopropanol showed no significant effect on H 2 O 2 generation, manifesting that • OH had a poor contribution to photocatalytic H 2 O 2 production. Following this, ESR was further utilized to investigate the generation of 1 O 2 and • O 2 – during the whole process, and it can be observed that there is no obvious signal related to TEMP- 1 O 2 and DMPO- • O 2 – in ESR under dark conditions . Nevertheless, the DMPO- • O 2 – and TEMP- 1 O 2 signals are significantly enhanced after light illumination (Figure f,g), indicating that • O 2 – and 1 O 2 are the main active substances during the photocatalytic reaction.…”

Section: Resultsmentioning

confidence: 94%

Order–Disorder Engineering of Carbon Nitride for Photocatalytic H₂O₂ Generation Coupled with Pollutant Removal

Xu,

Wu,

Qian

et al. 2024

ACS Appl. Mater. Interfaces

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Highly crystalline carbon nitride (CCN), benefiting from the reduced structural imperfections, enables improved electron−hole separation. Yet, the crystalline phase with insufficient inherent defects suffers from a poor performance toward the reaction intermediate adsorption with respect to the amorphous phase. Herein, a crystalline−amorphous carbon nitride (CACN) with an isotype structure was constructed via a two-step adjacent calcination strategy. Through specific oxygen etching and crystallization, the formation of a built-in electric field at the interface could drive charge transfer and separation, thus promoting photoredox reaction. As expected, the optimized CACN exhibited a H 2 O 2 generation efficiency as high as 2.15 mM g cat −1 h −1 , paired with a promoted pollutant degradation efficiency, which outperform its crystalline (CCN) and amorphous [amorphous carbon nitride (ACN)] counterparts. The detailed electron/hole transportation via a built-in electronic field and free radical formation based on the enhanced adsorption of oxygen were considered, and the synchronous reaction pathway was carried out. This work paves a novel pathway for the synthesis of carbon nitride with an isotype structure from the perspective of interfacial engineering.

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Section: Resultsmentioning

confidence: 94%

Order–Disorder Engineering of Carbon Nitride for Photocatalytic H₂O₂ Generation Coupled with Pollutant Removal

Xu,

Wu,

Qian

et al. 2024

ACS Appl. Mater. Interfaces

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“…The reactive sites of DCF were discussed based on the DFT calculation, and the area of attack of free radicals ( f 0 ) was predicted using the Fukui function. − The results show that the large reaction site f 0 will bring higher reactivity. Therefore, the results in Figure a,b show that the vulnerable reaction sites in DCF are C 5 ( f 0 = 0.0377), C 6 ( f 0 = 0.0660), N 10 ( f 0 = 0.0628), Cl 12 ( f 0 = 0.0968), Cl 13 ( f 0 = 0.0861), and C 20 ( f 0 = 0.0622).…”

Section: Results and Analysismentioning

confidence: 99%

Z-Scheme CdIn₂S₄/Bi₂WO₆ Heterojunction for High Piezo-Photo Synergetic Performance

Shi

et al. 2023

Inorg. Chem.

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The piezoelectric effect triggered by mechanical energy could establish an internal electric field to effectively modulate the separation behavior of carriers. Herein, a novel CdIn2S4/Bi2WO6 (CIS/BWO) piezo-photocatalyst for removing diclofenac (DCF) from water was constructed for the first time. Encouragingly, the photocatalytic degradation activity of CIS/BWO was effectively promoted through the piezoelectric effect. Specifically, 10% CIS/BWO exhibited promising DCF degradation performance under co-excitation of light irradiation and ultrasonic vibration, with a degradation efficiency of 99.9% within 40 min, much higher than that of pure photocatalysts (72.3%) and piezocatalysts (60.3%). Meanwhile, an in-depth study of the charge carrier separation mechanism of the CIS/BWO composite under the piezo-photo synergy condition was proposed. Both the built-in electric field induced by the piezoelectric effect in BWO and the Z-scheme transfer path of the CIS/BWO heterojunction are beneficial to interfacial charge transfer. Moreover, the Z-scheme mechanism was further demonstrated by trapping experiments and the electron spin resonance (ESR) technique. Finally, the corresponding intermediates of DCF over CIS/BWO composites and possible degradation pathways were also investigated by DFT calculations and liquid chromatography–mass spectrometry.

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“…The surface morphology of the fabricated QDs was examined by TEM images to have less translucent layers, indicating that the QDs were multilayer adsorbents rather than single-layered carbon dots. This suggests that the QDs may be related to the sp 2 graphitic carbon and the diffraction plane of the sp 3 carbon, which resembles diamonds [7].…”

Section: Characterizationmentioning

confidence: 97%

“…Wave numbers between 1590.25 and 1513.3 cm -1 were attributed to C=C group existence. A peak with a radius of 3743.45 cm -1 that is associated with O-H stretching vibrations [7,[11][12][13]. The stretching of C-O groups is responsible for the adsorption spectra equal to 1444.89, 1250.61, and 1186.5 cm -1 .…”

Section: Characterizationmentioning

confidence: 99%

“…The creation processes and physical/chemical characteristics of these luminous QDs will be discussed first in this paper. Following that, the methods used to fabricate carbon quantum dots from biomass waste including typical methods used to fabricate QDs, the characterization of the QDs fabricated and the use of QDs in wastewater treatment, such as membrane filtering [2], electrochemical reduction ion-exchange [7], photocatalytic degradation [8] and adsorption [1,9,10], particularly the benefits they could provide to these features.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, characterization, photoluminescent properties of carbon quantum dots and its applications in wastewater treatment

Nizam

Hanafiah

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Carbon-based nanomaterials are currently gaining attention in wastewater treatment. They have gained a prime position in membrane filtration to degrade pollutants. One of the most recent additions to the field of carbon-based nanomaterials is quantum dots (QDs). Due to their exceptional qualities, QDs are among the most promising carbon-based nanomaterials at the forefront of the wastewater treatment research field. Nonetheless, most quantum dots were not sustainably fabricated. Therefore, this study aims to evaluate the carbon-based carbon quantum dots derived from biomass wastes (rubber seed shells) where the properties, behaviour and photoluminescence characteristics were evaluated through several characterization analyses. The QDs were characterized using Fourier-transform infrared spectroscopy (FTIR), x-ray diffraction (XRD), field emission scanning electron microscope (FESEM) equipped with energy-dispersive X-ray spectroscopy (EDX), photoluminescence spectroscopy, zeta potential analyser and Raman spectroscopy. The morphological analysis revealed multi-layered planes with highly porous and uneven surfaces, consisting of a large number of oxygen-functional groups (hydroxyl, carboxyl, carbonyl). The mapping results showed a large uniform distribution of carbon and oxygen elements on the surface of QDs with a more signified composition of wt% carbon (72.4%) compared to oxygen elements, with 23.6%. The spectroscopic and photoluminescence studies confirmed the fabrication of high-quality carbon quantum dots with blue-greenish fluorescence emissions. These results have shown promising biomass-based QDs that can be applied in wastewater treatment based on their unique characteristics. Thus, the derived biomass-based QDs can be viewed as a promising and cost-effective adsorbent for wastewater and water treatment.

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Self-assembled graphitic carbon nitride regulated by carbon quantum dots with optimized electronic band structure for enhanced photocatalytic degradation of diclofenac

Cited by 39 publications

References 91 publications

Order–Disorder Engineering of Carbon Nitride for Photocatalytic H₂O₂ Generation Coupled with Pollutant Removal

Order–Disorder Engineering of Carbon Nitride for Photocatalytic H₂O₂ Generation Coupled with Pollutant Removal

Z-Scheme CdIn₂S₄/Bi₂WO₆ Heterojunction for High Piezo-Photo Synergetic Performance

Synthesis, characterization, photoluminescent properties of carbon quantum dots and its applications in wastewater treatment

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Self-assembled graphitic carbon nitride regulated by carbon quantum dots with optimized electronic band structure for enhanced photocatalytic degradation of diclofenac

Cited by 39 publications

References 91 publications

Order–Disorder Engineering of Carbon Nitride for Photocatalytic H2O2 Generation Coupled with Pollutant Removal

Order–Disorder Engineering of Carbon Nitride for Photocatalytic H2O2 Generation Coupled with Pollutant Removal

Z-Scheme CdIn2S4/Bi2WO6 Heterojunction for High Piezo-Photo Synergetic Performance

Synthesis, characterization, photoluminescent properties of carbon quantum dots and its applications in wastewater treatment

Contact Info

Product

Resources

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Order–Disorder Engineering of Carbon Nitride for Photocatalytic H₂O₂ Generation Coupled with Pollutant Removal

Order–Disorder Engineering of Carbon Nitride for Photocatalytic H₂O₂ Generation Coupled with Pollutant Removal

Z-Scheme CdIn₂S₄/Bi₂WO₆ Heterojunction for High Piezo-Photo Synergetic Performance