Sunlight mediated enhanced photocatalytic degradation of antibiotics in aqueous medium using silicon doped carbon quantum dots decorated Bi2MoO6 nanoflakes

Kumar, Gandharve; Cilamkoti, Vatsala; Dutta, Ruma

doi:10.1016/j.colsurfa.2022.128368

Cited by 20 publications

(4 citation statements)

References 61 publications

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“…Kumar et al. [ 63 ] prepared Si‐doped CDs‐23 by hydrothermal method. CDs‐23/Bi 2 MoO 6 photocatalyst was obtained by modifying CDs‐23 onto Bi 2 MoO 6 .…”

Section: Photocatalytic Materials Based On Cdsmentioning

confidence: 99%

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Design and Fabrication of Carbon Dots/Semiconductor Photocatalysts with Superior Photocatalytic Activity: A Review

Zhang,

Yan,

Wang

et al. 2023

Part & Part Syst Charact

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Semiconductor photocatalysts are being recognized as innovative materials for enhancing water quality and environmental optimization. Nevertheless, the limited activity and quick electron–hole pair recombination under visible light have hindered their widespread use in photocatalysis. Nanomaterials based on carbon dots (CDs) show promising applications due to their excellent light absorption ability. Notably, CDs/semiconductor photocatalysts have emerged as advanced photocatalytic materials. This review summarizes strategies to improve the performance of conventional semiconductor photocatalysts by incorporating CDs. These include TiO2, g‐C3N4, Bi‐based, Cu2O, and ZnO photocatalysts. Various effective synthesis routes for composites are discussed, including morphology optimization, heteroatom doping, heterojunction building, and creation of polymeric hybrids. Ultimately, the challenges and future prospects of CDs/semiconductor photocatalysts are discussed.

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“…Kumar et al. [ 63 ] prepared Si‐doped CDs‐23 by hydrothermal method. CDs‐23/Bi 2 MoO 6 photocatalyst was obtained by modifying CDs‐23 onto Bi 2 MoO 6 .…”

Section: Photocatalytic Materials Based On Cdsmentioning

confidence: 99%

“…Bi 2 MoO 6 is a chemically stable photocatalyst with a narrow bandgap, and its photocatalytic activity can be improved through coupling with carbon-based materials. Kumar et al [63] prepared Si-doped CDs-23 by hydrothermal method. CDs-23/Bi 2 MoO 6 photocatalyst was obtained by modifying CDs-23 onto Bi 2 MoO 6 .…”

Section: Bi-based Oxysaltmentioning

confidence: 99%

Design and Fabrication of Carbon Dots/Semiconductor Photocatalysts with Superior Photocatalytic Activity: A Review

Zhang,

Yan,

Wang

et al. 2023

Part & Part Syst Charact

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“…From the figure, it is clear that there is a two-step weight loss of 18 and 4% at about 75–108 and 245–281 °C, respectively. The first weight loss may be due to the evaporation of moisture and other organic solvents, and the second mass loss can be attributed to the detachment of thiol (TGA) ligands present in the ZCIS-2 moiety, indicating better stability of the QD up to 600 °C. , Furthermore, a comparison plot for H 2 O 2 evolution and CIP degradation of various photocatalysts is given in Figure , which shows the superiority of the present work (ZCIS QD) over other QD systems previously reported. − …”

Section: Applicationsmentioning

confidence: 99%

Defect Control via Compositional Engineering of Zn-Cu-In-S Alloyed QDs for Photocatalytic H₂O₂ Generation and Micropollutant Degradation: Affecting Parameters, Kinetics, and Insightful Mechanism

et al. 2022

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Photocatalytic H 2 O 2 production and recalcitrant pollutant degradation are regarded as promising clean technology toward achieving sustainable solar-to-chemical energy conversion. Herein, nonstoichiometric Zn-Cu-In-S (ZCIS) quaternary alloyed quantum dots (QDs) are rationally fabricated via a reflux method toward H 2 O 2 generation and ciprofloxacin degradation under visible light irradiation. The optimum catalyst (ZCIS-2) exhibits a notable H 2 O 2 production of 1685.2 μmole h −1 g −1 (solar-tochemical conversion efficiency (SCC), 0.19%), which is 5.3 times higher than that of CuInS 2 (CIS), and a ciprofloxacin (CIP) degradation efficiency of 96% in 2 h. The observed improvement in activity corresponds to optimized exciton separation/transfer, broad photon absorption, tunable band alignment, and effective adsorption/activation. In addition, oxygen reduction goes through both direct two-electron single-step reduction and single-electron two-step superoxide radical pathways, whereas CIP degradation proceeds via direct • O 2 − and indirect • OH radical pathways, as confirmed by scavenger experiments. An appropriate amount of defects improves the adsorption/activation of O 2 toward H 2 O 2 and active oxygen species generation that facilitates CIP degradation. The effect of operational parameters, such as pH, surrounding environment, presence of ions, sacrificial agent, etc., on both H 2 O 2 formation and CIP removal is vividly studied. Hence, the current study will provide an in-depth insight into O 2 photoreduction and micropollutant removal, which encourages further advancement of potent alloyed quantum dot-oriented photocatalytic systems.

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“…The role of specific ROS toward photocatalytic degradations of TC and CIP was studied by the radical scavenging method. 21 In this regard, ammonium oxalate (AO, 1.0 mM), 67 isopropyl alcohol (IPA,1.0 mM), 68 sodium azide (NaN 3 , 1.0 mM), 69 and chloroform (1.0 mM) 70 were added as quenchers in the reaction medium comprising 2-ACCN/ Bi 2 WO 6 as the photocatalyst and TC/CIP for scavenging photogenerated holes (h + ), hydroxyl radicals (OH • ), singlet oxygen ( 1 O 2 ), and superoxide radicals (O 2 −• ), respectively. It is noted that the photocatalytic degradations of TC and CIP were significantly inhibited in the batch spiked with chloroform for O 2 −• radical scavenging (Figure 9c, d).…”

Section: Mechanism Of Photocatalytic Degradation By Accn/bi 2 Womentioning

confidence: 99%

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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Sunlight mediated enhanced photocatalytic degradation of antibiotics in aqueous medium using silicon doped carbon quantum dots decorated Bi2MoO6 nanoflakes

Cited by 20 publications

References 61 publications

Design and Fabrication of Carbon Dots/Semiconductor Photocatalysts with Superior Photocatalytic Activity: A Review

Design and Fabrication of Carbon Dots/Semiconductor Photocatalysts with Superior Photocatalytic Activity: A Review

Defect Control via Compositional Engineering of Zn-Cu-In-S Alloyed QDs for Photocatalytic H₂O₂ Generation and Micropollutant Degradation: Affecting Parameters, Kinetics, and Insightful Mechanism

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

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Sunlight mediated enhanced photocatalytic degradation of antibiotics in aqueous medium using silicon doped carbon quantum dots decorated Bi2MoO6 nanoflakes

Cited by 20 publications

References 61 publications

Design and Fabrication of Carbon Dots/Semiconductor Photocatalysts with Superior Photocatalytic Activity: A Review

Design and Fabrication of Carbon Dots/Semiconductor Photocatalysts with Superior Photocatalytic Activity: A Review

Defect Control via Compositional Engineering of Zn-Cu-In-S Alloyed QDs for Photocatalytic H2O2 Generation and Micropollutant Degradation: Affecting Parameters, Kinetics, and Insightful Mechanism

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

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Defect Control via Compositional Engineering of Zn-Cu-In-S Alloyed QDs for Photocatalytic H₂O₂ Generation and Micropollutant Degradation: Affecting Parameters, Kinetics, and Insightful Mechanism

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