Bactericidal efficiency and photochemical mechanisms of micro/nano bubble–enhanced visible light photocatalytic water disinfection

Wang, Fan; Cui, Jingyu; Li, Qi; Huo, Yang; Xiao, Dan; Xia, Yang; Yu, Hao; Wang, Chunliang; Jarvis, Peter; Lyu, Tao; Huo, Mingxin

doi:10.1016/j.watres.2021.117531

Cited by 39 publications

(7 citation statements)

References 61 publications

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“…The pivotal role of O 2 •– is further confirmed by scavenging experiments. Various scavengers, including 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPOL), sodium oxalate (Na 2 C 2 O 4 ), potassium dichromate (K 2 Cr 2 O 7 ), and FFA, which respectively scavenge O 2 •– , photogenerated holes, photogenerated electrons, and 1 O 2 , are introduced to investigate their respective influences. ,− As shown in Figure d, K 2 Cr 2 O 7 shows the strongest suppression effect on the Mn-N 3 C 1 /light system, resulting in the inactivation of only 2.43 log 10 cfu/mL of the bacteria within 9 min. TEMPOL follows with the inactivation of 3.40 log 10 cfu/mL of the bacteria within the same time frame, while FFA and Na 2 C 2 O 4 exhibit negligible suppression effects.…”

Section: Resultsmentioning

confidence: 99%

Unraveling Valence Electron Number Dependent Excitonic Effects over M₁-N₃C₁ Sites in Single-Atom Catalysts

Ma,

Tang,

Guan

et al. 2024

ACS Nano

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Excitonic effects significantly influence the selective generation of reactive oxygen species and photothermal conversion efficiency in photocatalytic reactions; however, the intrinsic factors governing excitonic effects remain elusive. Herein, a series of single-atom catalysts with well-defined M 1 -N 3 C 1 (M = Mn, Fe, Co, and Ni) active sites are designed and synthesized to investigate the structure− activity relationship between photocatalytic materials and excitonic effects. Comprehensive characterization and theoretical calculations unveil that excitonic effects are positively correlated with the number of valence electrons in single metal atoms. The single Mn atom with 5.93 valence electrons exhibits the weakest excitonic effects, which dominate superoxide radical (O 2•− ) generation through charge transfer and enhance photothermal conversion efficiency. Conversely, the single Ni atom with 9.27 valence electrons exhibits the strongest excitonic effects, dominating singlet oxygen ( 1 O 2 ) generation via energy transfer while suppressing photothermal conversion efficiency. Based on the valence electron number dependent excitonic effects, a reaction environment with hyperthermia and abundant cytotoxic O 2•− is designed, achieving efficient and stable water disinfection. This work reveals single metal atom dependent excitonic effects and presents an atomic-level methodology for catalytic application targeted reaction environment tailoring.

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Section: Resultsmentioning

confidence: 99%

Unraveling Valence Electron Number Dependent Excitonic Effects over M₁-N₃C₁ Sites in Single-Atom Catalysts

Ma,

Tang,

Guan

et al. 2024

ACS Nano

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“…the spore inactivation by enhancing light adsorption and triggering the formation of a region of enhanced light intensity. [76] 2.3.6. Photogenerated Holes (h þ )…”

Section: Hydrogen Peroxide (H 2 O 2 )mentioning

confidence: 99%

“…The interfacial photoelectric effect, strong light scattering and nonuniformities in dielectricity from the MNBs also promoted the spore inactivation by enhancing light adsorption and triggering the formation of a region of enhanced light intensity. [ 76 ]…”

Section: Photocatalytic‐disinfection Pathways and Mechanismsmentioning

confidence: 99%

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Advances in Photocatalytic Disinfection: Performances and Mechanisms

Wang

Tan

et al. 2023

Solar RRL

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Photocatalytic technology is a sustainable, efficient, and eco‐friendly advanced oxidation process for addressing the hazards of microorganisms (bacteria and viruses). In this article, the latest results in the studies on the use of semiconductor photocatalysts to remove microorganisms and their related genes (DNA and RNA) from the environment, including operating conditions and removal efficiency, are summarized. The photocatalytic‐disinfection mechanism is described in detail, related to solar (especially ultraviolet light) disinfection, physical damage by sharp edges of photocatalysts, and various reactive oxygen species generated during photocatalytic processes. Also, the difficulties and challenges of photocatalytic disinfection in practical applications are discussed. With the further development of photocatalysis technology, sunlight‐driven and even indoor‐light‐driven photocatalysts will have a more promising application in environmental disinfection involving water, air, and object surfaces.

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“…Hydrogen peroxide (H 2 O 2 ) has been considered an efficient and green ROS for water disinfection owing to its relatively long lifetime and safe byproducts ( Sun et al., 2014 ). Notably, H 2 O 2 can enhance bactericidal efficiency by quickly penetrating the cell membrane of bacteria ( Fan et al., 2021 ). Moreover, H 2 O 2 is difficult to react with the matrix components, thereby exhibiting excellent bactericidal activity and anti-interference ability in practical wastewater.…”

Section: Introductionmentioning

confidence: 99%

Modulation of ultrathin nanosheet structure and nitrogen defects in graphitic carbon nitride for efficient photocatalytic bacterial inactivation

et al. 2023

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Bactericidal efficiency and photochemical mechanisms of micro/nano bubble–enhanced visible light photocatalytic water disinfection

Cited by 39 publications

References 61 publications

Unraveling Valence Electron Number Dependent Excitonic Effects over M₁-N₃C₁ Sites in Single-Atom Catalysts

Unraveling Valence Electron Number Dependent Excitonic Effects over M₁-N₃C₁ Sites in Single-Atom Catalysts

Advances in Photocatalytic Disinfection: Performances and Mechanisms

Modulation of ultrathin nanosheet structure and nitrogen defects in graphitic carbon nitride for efficient photocatalytic bacterial inactivation

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Bactericidal efficiency and photochemical mechanisms of micro/nano bubble–enhanced visible light photocatalytic water disinfection

Cited by 39 publications

References 61 publications

Unraveling Valence Electron Number Dependent Excitonic Effects over M1-N3C1 Sites in Single-Atom Catalysts

Unraveling Valence Electron Number Dependent Excitonic Effects over M1-N3C1 Sites in Single-Atom Catalysts

Advances in Photocatalytic Disinfection: Performances and Mechanisms

Modulation of ultrathin nanosheet structure and nitrogen defects in graphitic carbon nitride for efficient photocatalytic bacterial inactivation

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Product

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Unraveling Valence Electron Number Dependent Excitonic Effects over M₁-N₃C₁ Sites in Single-Atom Catalysts

Unraveling Valence Electron Number Dependent Excitonic Effects over M₁-N₃C₁ Sites in Single-Atom Catalysts