Enhanced photocatalytic H2/H2O2 production and tetracycline degradation performance of CdSe quantum dots supported on K, P, N-co-doped hollow carbon polyhedrons

Xu, Jixiang; Ji, Qingjie; Wang, Yi; Wang, Chao; Wang, Lei

doi:10.1016/j.cej.2021.130808

Cited by 27 publications

(15 citation statements)

References 52 publications

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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: 59%

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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Section: Applicationsmentioning

confidence: 59%

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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“…3d). Compared to other various types of photocatalysts reported in the literature, 8,10,11,17,[55][56][57][58] the photocatalytic H 2 O 2 production using the CdSe 550 /5CdS/2ZnS QDs as the photocatalyst in this work shows a superior performance in the same irradiation time with the maximum concentration of H 2 O 2 at 126 mmol L −1 (Table S1 †).…”

Section: Catalysis Science and Technology Papermentioning

confidence: 72%

“…This value greatly exceeds those of the photocatalytic H 2 O 2 production reported in previous reports. 8,10,11,17,[55][56][57][58] Further growth of the ZnS shells onto the CdSe 550 /5CdS QDs is hindered because of the large lattice mismatch and the interface strain, which results in irregular dots with branches on the surface (Fig. S8 ESI †).…”

Section: Catalysis Science and Technology Papermentioning

confidence: 99%

High-efficiency visible-light photocatalytic H₂O₂ production using CdSe-based core/shell quantum dots

Zhang

et al. 2022

Catal. Sci. Technol.

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“…ZS4K40 has a much smaller arc diameter than that of ZS3K6, which implied a faster charge transfer ability. 17,64 To explore the reaction mechanism, photocatalytic production of H 2 O 2 over ZS4K40 was performed under different atmospheric conditions. In Fig.…”

Section: Photocatalytic Mechanismmentioning

confidence: 99%

Size-controlled growth of ZnSe nanocrystals for high-performance photocatalytic H₂O₂ production in pure water

Zhang

Wang

et al. 2023

Nanoscale

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Enhanced photocatalytic H2/H2O2 production and tetracycline degradation performance of CdSe quantum dots supported on K, P, N-co-doped hollow carbon polyhedrons

Cited by 27 publications

References 52 publications

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

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

High-efficiency visible-light photocatalytic H₂O₂ production using CdSe-based core/shell quantum dots

Size-controlled growth of ZnSe nanocrystals for high-performance photocatalytic H₂O₂ production in pure water

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Enhanced photocatalytic H2/H2O2 production and tetracycline degradation performance of CdSe quantum dots supported on K, P, N-co-doped hollow carbon polyhedrons

Cited by 27 publications

References 52 publications

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

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

High-efficiency visible-light photocatalytic H2O2 production using CdSe-based core/shell quantum dots

Size-controlled growth of ZnSe nanocrystals for high-performance photocatalytic H2O2 production in pure water

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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

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

High-efficiency visible-light photocatalytic H₂O₂ production using CdSe-based core/shell quantum dots

Size-controlled growth of ZnSe nanocrystals for high-performance photocatalytic H₂O₂ production in pure water