Carbon quantum dots supported zinc oxide (ZnO/CQDs) efficient photocatalyst for organic pollutant degradation – A systematic review

Ja’farawy, Muhammad Shalahuddin Al; Kusumandari, Kusumandari; Purwanto, Agus; Widiyandari, Hendri

doi:10.1016/j.enmm.2022.100681

Cited by 23 publications

(21 citation statements)

References 202 publications

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“…The lowering of the band gap in the batches of ACCN/Bi 2 WO 6 photocatalysts is attributable to the change in the band structure due to incorporation of ACCN on the surface of Bi 2 WO 6 . These results are consistent with the reported literature on carbon quantum dots decorated on metal oxide nanoparticles. , …”

Section: Resultssupporting

confidence: 94%

Amine-Functionalized Crystalline Carbon Nanodots Decorated on Bi₂WO₆ Nanoplates as Solar Photocatalysts for Efficient Degradation of Tetracycline and Ciprofloxacin

Bisht

Kumar

Dutta

2022

Ind. Eng. Chem. Res.

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A bismuth tungstate (Bi 2 WO 6 ) nanoplate surface decorated with amine-functionalized crystalline carbon nanodots (ACCN) is developed as a sunlight responsive photocatalyst for degradation of tetracycline and ciprofloxacin antibiotics. The photocatalyst, named ACCN/Bi 2 WO 6 , has been thoroughly characterized to elucidate its structural, morphological, textural, and compositional aspects. The crystalline carbon nanodots are synthesized by hydrothermal treatment of ortho-phenylenediamine with a zwitterionic L-alanine, which offered doping of a large number of nitrogen atoms. Because of these features, compared to pristine Bi 2 WO 6 , the optimized batch of the photocatalyst prepared with 2 wt % ACCN (named 2-ACCN/Bi 2 WO 6 ) exhibited significantly enhanced degradation of tetracycline (96%) and ciprofloxacin (95%) within 75 min of sunlight exposure. The corresponding photocatalytic degradation rates are 0.030 and 0.027 min −1 , respectively. The mechanism involved in photocatalytic degradation is addressed in the light of ( a) enhanced absorption of sunlight by 2-ACCN/Bi 2 WO 6 , (b) favorable Z-scheme-like band positions of Bi 2 WO 6 and the HOMO−LUMO levels of ACCN, (c) large photocurrent density, (d) inhibition of charge carrier recombination and formation of reactive oxygen species (ROS), (e) in situ generation of a superoxide radical anion (O 2 −• ), confirmed by specific ROS scavenging studies, and (f) identification of intermediate products by ultraperformance liquid chromatography coupled to quadrupole time-of-flight mass spectrometry.

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Section: Resultssupporting

confidence: 94%

Amine-Functionalized Crystalline Carbon Nanodots Decorated on Bi₂WO₆ Nanoplates as Solar Photocatalysts for Efficient Degradation of Tetracycline and Ciprofloxacin

Bisht

Kumar

Dutta

2022

Ind. Eng. Chem. Res.

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“…2 (e) shows the UV/VIS spectrum of a diluted 1000 times carbon quantum dot solution. The absorption peak of the prepared sample in the UV/VIS region is related to the absorption of CQDs, and a typical electronic transition n-π* transition peak is observed at 345 nm due to the presence of oxygen-containing functional groups (such as C–O, C O) at the surface of CQDs [ 27 ]. The inset graphs in Fig.…”

Section: Resultsmentioning

confidence: 99%

Agricultural and industrial wastes applied on the high performance energy storage devices

Yu,

Lin,

et al. 2024

Heliyon

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“…Compared to other metal oxide semiconductor photocatalytic materials, ZnO exhibits better photosensitivity and photochemical stability (M Arunpandian et al 2020 ). There are numerous studies on the photodegradation of organic compounds, mainly dyes such as MB, Rhodamine, benzoic acid, and Congo red (Al Ja’farawy et al 2022 ). The advantage of using ZnO is that the degradation of pollutants can take place by using sunlight, through the active sites and hydroxyl radicals on the surface of the photocatalyst (Bhuyan et al 2015 ).…”

Section: New Reliable Photocatalytic Matrix Based On Zno Nanostructuresmentioning

confidence: 99%

“…CQDs can act as an electron sink by preventing the recombination of electron–hole pairs. It is believed that CQDs can act as mediator electrons to increase the efficiency of visible light separation, increasing the concentration of free radicals such as O 2 ∙ and ∙OH (Al Ja’farawy et al 2022 ; Ru Wang et al 2017a ). The photocatalytic degradation mechanism is based on photoexcited electron transfer from CB of ZnO to CQD.…”

Section: New Reliable Photocatalytic Matrix Based On Zno Nanostructuresmentioning

confidence: 99%

“…The significance of water quality underscores the formulation of innovative design concepts for advanced nanomaterials, specifically tailored to address emerging pollutants in water bodies and wastewater treatment facilities (Al Ja’farawy et al 2022 ). The aim is the creation of some facile and easily accessible products for rapid response and high sensitivity in pollution removal.…”

Section: Introductionmentioning

confidence: 99%

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ZnO nanostructured matrix as nexus catalysts for the removal of emerging pollutants

Matei,

Șăulean,

Râpă

et al. 2023

Environ Sci Pollut Res

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Water pollution stands as a pressing global environmental concern, elevating the significance of innovative, dependable, and sustainable solutions. This study represents an extensive review of the use of photocatalytic zinc oxide nanoparticles (ZnO NPs) for the removal of emerging pollutants from water and wastewater. The study examines ZnO NPs’ different preparation methods, including physical, chemical, and green synthesis, and emphasizes on advantages, disadvantages, preparation factors, and investigation methods for the structural and morphological properties. ZnO NPs demonstrate remarkable properties as photocatalysts; however, their small dimensions pose an issue, leading to potential post-use environmental losses. A strategy to overcome this challenge is scaling up ZnO NP matrices for enhanced stability and efficiency. The paper introduces novel ZnO NP composites, by incorporating supports like carbon and clay that serve as photocatalysts in the removal of emerging pollutants from water and wastewater. In essence, this research underscores the urgency of finding innovative, efficient, and eco-friendly solutions for the removal of emerging pollutants from wastewater and highlights the high removal efficiencies obtained when using ZnO NPs obtained from green synthesis as a photocatalyst. Future research should be developed on the cost–benefit analysis regarding the preparation methods, treatment processes, and value-added product regeneration efficiency. Graphical Abstract

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Carbon quantum dots supported zinc oxide (ZnO/CQDs) efficient photocatalyst for organic pollutant degradation – A systematic review

Cited by 23 publications

References 202 publications

Amine-Functionalized Crystalline Carbon Nanodots Decorated on Bi₂WO₆ Nanoplates as Solar Photocatalysts for Efficient Degradation of Tetracycline and Ciprofloxacin

Amine-Functionalized Crystalline Carbon Nanodots Decorated on Bi₂WO₆ Nanoplates as Solar Photocatalysts for Efficient Degradation of Tetracycline and Ciprofloxacin

Agricultural and industrial wastes applied on the high performance energy storage devices

ZnO nanostructured matrix as nexus catalysts for the removal of emerging pollutants

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Carbon quantum dots supported zinc oxide (ZnO/CQDs) efficient photocatalyst for organic pollutant degradation – A systematic review

Cited by 23 publications

References 202 publications

Amine-Functionalized Crystalline Carbon Nanodots Decorated on Bi2WO6 Nanoplates as Solar Photocatalysts for Efficient Degradation of Tetracycline and Ciprofloxacin

Amine-Functionalized Crystalline Carbon Nanodots Decorated on Bi2WO6 Nanoplates as Solar Photocatalysts for Efficient Degradation of Tetracycline and Ciprofloxacin

Agricultural and industrial wastes applied on the high performance energy storage devices

ZnO nanostructured matrix as nexus catalysts for the removal of emerging pollutants

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Product

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Amine-Functionalized Crystalline Carbon Nanodots Decorated on Bi₂WO₆ Nanoplates as Solar Photocatalysts for Efficient Degradation of Tetracycline and Ciprofloxacin

Amine-Functionalized Crystalline Carbon Nanodots Decorated on Bi₂WO₆ Nanoplates as Solar Photocatalysts for Efficient Degradation of Tetracycline and Ciprofloxacin