Work function mediated interface charge kinetics for boosting photocatalytic water sterilization

Liu, Zhaoli; Gao, Wenzhe; Liu, Lizhi; Luo, Shijia; Zhang, Cui; Yue, Tian‐Li; Sun, Jing; Zhu, Ming-Qiang; Wang, Jianlong

doi:10.1016/j.jhazmat.2022.130036

Cited by 46 publications

(13 citation statements)

References 40 publications

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“…The fluorescence lifetime of O–CN (41.32 ns) and IDT-COOH (26.11 ns) is longer than that of 40% IDT-COOH/O–CN (14.12 ns), which indicates that more carriers could participate in the subsequent photocatalytic reaction via the effect of the IEF in heterojunction (Figure d) . The above results show that IEF and strong electron delocalization effect could promote the separation of e – –h + pairs and increase the migration efficiency of photogenerated carriers …”

Section: Resultsmentioning

confidence: 90%

Enhanced Photocatalytic Properties of All-Organic IDT-COOH/O–CN S-Scheme Heterojunctions Through π–π Interaction and Internal Electric Field

Wang,

Li,

Che

et al. 2024

ACS Appl. Mater. Interfaces

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Herein, we present a distinct methodology for the in situ electrostatic assembly method for synthesizing a conjugated (IDT-COOH)/oxygen-doped g-C 3 N 4 (O−CN) S-scheme heterojunction. The electron delocalization effect due to π−π interactions between O−CN and self-assembled IDT-COOH favors interfacial charge separation. The self-assembled IDT-COOH/O−CN exhibits a broadened visible absorption to generate more charge carriers. The internal electric field between the IDT-COOH and the O−CN interface provides a directional charge-transfer channel to increase the utilization of photoinduced charge carriers. Moreover, the active species ( • O 2 − , h + , and 1 O 2 ) produced by IDT-COOH/O−CN under visible light play important roles in photocatalytic disinfection. The optimum 40% IDT-COOH/O−CN can kill 7-log of methicillin-resistant Staphylococcus aureus (MRSA) cells in 2 h and remove 88% tetracycline (TC) in 5 h, while O−CN only inactivates 1-log of MRSA cells and degrades 40% TC. This work contributes to a promising method to fabricate all-organic g-C 3 N 4 -based S-scheme heterojunction photocatalysts with a wide range of optical responses and enhanced exciton dissociation.

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Section: Resultsmentioning

confidence: 90%

Enhanced Photocatalytic Properties of All-Organic IDT-COOH/O–CN S-Scheme Heterojunctions Through π–π Interaction and Internal Electric Field

Wang,

Li,

Che

et al. 2024

ACS Appl. Mater. Interfaces

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“…The binding energy shifts can demonstrate the existence of significant charge transfer between MXene and CN. , Moreover, ultraviolet photoelectron spectroscopy (UPS) was used to probe the Fermi energy levels of the components and to determine the type of heterojunction by the difference in the work function. The secondary electron cutoff energies ( E cutoff ) for CN, MXene, and MCN 2:1 were 16.85, 16.17, and 16.55 eV, respectively, and their work functions ( E WF ) were 4.37, 5.05, and 4.67 eV, respectively, on the basis of the equation E WF = E He I (21.22 eV) – E cutoff (Figure d) . In Figure e, when CN and MXene were in close contact, the electrons of CN can spontaneously flow to the interface of MXene until their Fermi energy levels reach equilibrium (4.67 eV) due to the significant E WF difference between CN and MXene.…”

Section: Resultsmentioning

confidence: 96%

“…The TEM images of the 2D/2D MCN heterojunction (Figure 1e 2d). 42 In Figure 2e, when CN and MXene were in close contact, the electrons of CN can spontaneously flow to the interface of MXene until their Fermi energy levels reach equilibrium (4.67 eV) due to the significant E WF difference between CN and MXene. Note that the band gap, conduction band, and valence band energy levels marked in Figure 2e are analyzed in Figure S10.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

In Situ Fabrication of a 2D/2D MXene/CN Heterojunction for Photothermally Assisted Photocatalytic Sterilization under Visible Light Irradiation

Jin,

Zhi,

Sun

et al. 2023

Inorg. Chem.

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Constructing an efficient visible light-responsive antibacterial material for water treatment remains a principal goal yet is a huge challenge. Herein, a 2D/2D heterojunction composite with robust interfacial contact, named MXene/CN (MCN), was controllably fabricated by using a urea molecule intercalated into MXene following an in situ calcination method, which can realize the rapid separation and migration of photogenerated carriers under visible light irradiation and significantly improve the carrier concentration of the MXene surface, thus generating more reactive oxygen species. The generation of heat induced by MXene could also increase photogenic electron activity to facilitate the photocatalytic reaction using in situ time-resolved photoluminescence characterization. The visible light-activated germicide exhibits a sterilization efficacy against Escherichia coli of 99.70%, higher than those of pure CN (60.21%) and MXene (31.75%), due to the effect of photothermally assisted photocatalytic treatment. This work is an attempt to construct a visible light-driven antimicrobial material using Schottky junctions achieving photothermally assisted photocatalytic disinfection.

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“…The rapid recombination of photogenerated electron–hole pairs in the photocatalytic reaction and the hysteresis kinetics of the catalyst surface reaction limit the activity of the photocatalyst. Generally, the work function (Φ) determines the band alignment and charge transfer direction of the heterostructure, [ 70 ] while the work function of MXene is determined by its metal component and surface group. The work function of MXene is adjustable, resulting in different components of MXene may have metal‐like properties or semiconductor properties.…”

Section: Cocatalyst For Photoinduced E−/h+mentioning

confidence: 99%

Roles of MXenes in Photocatalysis

Yang,

Liu,

Hang

et al. 2023

Solar RRL

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Artificial photocatalysis is beneficial to carbon neutrality, renewable resources generation and sustainable society development. Due to the unique layered structure, abundant surface functional groups and tunable electronic properties, Maxine is emerging as a promising contender to improve the comprehensive performance for photocatalysts. Much progress has been made in the study of MXene‐based nanomaterials over the past years, and state‐of‐the‐art advances in the rational design, controllable synthesis, characterization techniques and diverse applications of MXene‐based photocatalysts have been reviewed. However, the roles and perspectives of MXenes in photocatalysis have been less summarized. Based on the analysis of physical/chemical properties of MXenes and the latest research progress, herein we discuss the multiple roles of MXenes in promoting photocatalysis, including carrier for active site anchoring, light‐transmitting media, mass transfer medium, cocatalyst and heat conductor. In addition, current status and challenges of MXenes in photocatalysis are summarized, and the future directions as well as the bottleneck of development need to be broken through for MXenes in photocatalysis are also proposed. This review provides a clear and in‐depth understanding of the physical/chemical properties of MXene‐based photocatalysts and their contributions for photocatalysis.This article is protected by copyright. All rights reserved.

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Work function mediated interface charge kinetics for boosting photocatalytic water sterilization

Cited by 46 publications

References 40 publications

Enhanced Photocatalytic Properties of All-Organic IDT-COOH/O–CN S-Scheme Heterojunctions Through π–π Interaction and Internal Electric Field

Enhanced Photocatalytic Properties of All-Organic IDT-COOH/O–CN S-Scheme Heterojunctions Through π–π Interaction and Internal Electric Field

In Situ Fabrication of a 2D/2D MXene/CN Heterojunction for Photothermally Assisted Photocatalytic Sterilization under Visible Light Irradiation

Roles of MXenes in Photocatalysis

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