Constructing S-scheme Co3O4-C3N4 catalyst with superior photoelectrocatalytic efficiency for water purification

Zhao, Fanyue; Li, Wenfeng; Song, Yu; Fu, Yinghuan; Liu, Xinghui; Chun, Ma; Wang, Guowen; Dong, Xiaoli; Ma, Hongchao

doi:10.1016/j.apmt.2022.101390

Cited by 13 publications

(16 citation statements)

References 62 publications

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“…And due to the contact between CdS QDs and La-Bi 2 WO 6 , electrons spontaneously transfer from CdS QDs to La-Bi 2 WO 6 , resulting in an electric potential difference between them. [1] It is consistent with the work function and ISIXPS analysis.…”

Section:  Investigation Of the Mechanism Of Photocatalytic Degradationsupporting

confidence: 86%

“…With rapid population growth and extensive industrialization, the widespread discharge of various hazardous wastes and organic pollutants has made water pollution an increasingly severe problem. [1][2][3] Among these pollutants, the dye concentration in water is more significant and has received greater attention. The standard sewage treatment methods include adsorption, [4][5][6] coagulation, [7,8] oxidation, [9,10] electrolysis, [11][12][13] and biological treatment methods.…”

Section: Introductionmentioning

confidence: 99%

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Designing advanced S‐scheme CdS QDs/La‐Bi₂WO₆ photocatalysts for efficient degradation of RhB

Ning,

Zhang,

Siqin

et al. 2023

Exploration

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Finding effective strategies to design efficient photocatalysts and decompose refractory organic compounds in wastewater is a challenging problem. Herein, by coupling element doping and constructing heterostructures, S‐scheme CdS QDs/La‐Bi2WO6 (CS/LBWO) photocatalysts are designed and synthesized by a simple hydrothermal method. As a result, the RhB degradation efficiency of the optimized 5% CS/LBWO reached 99% within 70 min of illumination with excellent stability and recyclability. CS/LBWO shows improvement in the adsorption range of visible light and promotes electron–hole pair generation/migration/separation, attributing the superior degradation performance. The degradation RhB mechanism is proposed by a free radical capture experiment, electron paramagnetic resonance, and high‐performance liquid chromatography‐mass spectrometry results, indicating that h+ and •O2– play a significant role during four degradation processes: de‐ethylation, chromophore cleavage, ring opening, and mineralization. Based on in situ irradiated X‐ray photoelectron spectroscopy, Mulliken electronegativity theory, and the work function results, the S‐scheme heterojunction of CS/LBWO promotes the transfer of photogenerated electron–hole pairs and promotes the generation of reactive radicals. This work not only reports that 5% CS/LBWO is a promising photocatalyst for degradation experiments but also provides an approach to design advanced photocatalysts by coupling element doping and constructing heterostructures.

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Section:  Investigation Of the Mechanism Of Photocatalytic Degradationsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Designing advanced S‐scheme CdS QDs/La‐Bi₂WO₆ photocatalysts for efficient degradation of RhB

Ning,

Zhang,

Siqin

et al. 2023

Exploration

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“…The CBM of g-CN and MoS 2 are −1.12 and −0.05 eV, respectively, while the highest values of the VBM are 1.56 and 1.70 eV, according to the literature. 13,42,43 It has been found that, in most cases, the individual components suffer from fast charge recombination processes. However, the formation of a heterostructure (V:g-CN/MS) has been shown to reduce the charge recombination rate further.…”

Section: Possible Pec Reaction Mechanism Of Nanoheterostructuresmentioning

confidence: 99%

“…Poor pollutant selectivity, high production cost, rapid charge recombination, corrosion in the presence of light, poor reusability, and limited recycling options are characteristics that estimate the quality of heterogeneous photocatalysts. The current trend is to increase the selectivity, efficiency, and stability of heterogeneous photocatalysts. , …”

Section: Introductionmentioning

confidence: 99%

Photoelectrochemical Water Separation and Dye Degradation Catalyzed by g-C₃N₄/MoS₂ Nanosheets Doped with V²⁺ Metal Ions Coated on TiO₂ Nanorods

Periyasamy,

Liu,

Sathiya

et al. 2024

ACS Appl. Nano Mater.

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Photoelectrochemical (PEC) systems are inefficient, probably due to charge carrier mobility, recombination rate, and solar light absorption. Fabricating semiconductor-metal sulfide nanocomposites and nanostructured materials can improve the absorption of solar radiation, electron−hole separation, transport, and hydrogen (H 2 ) and oxygen generation to resolve the world's energy dilemma. The vanadium-doped (V) layered graphitic carbon nitride (g-CN)/MoS 2 (MS) nanocomposite was synthesized employing two-step solvent evaporation and thermal condensation. This multilayer V-doped g-CN/MS nanocomposite broke down methyl red dye in 60 min under sunlight. Due to visible light absorption, the V-doped g-CN-MS nanostructure degrades the dye by 97.84%. We found that at 3.0 wt % V-doped g-CN/MS coated on TiO 2 nanorods. The catalyst nanocomposites displayed a high photocurrent density of 23.72 mA cm −2 and a H 2 production rate of 4477 mol h −1 cm −2 . Additionally, the microstructure, optical absorption behavior, and electrical conductivity were all shown to contribute to these impressive PEC characteristics. The Vmodified g-CN/MS nanocomposite structures are effective and regulated PEC catalysts, and this study suggests ways to improve PEC water splitting and degradation.

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“…Among the studied semiconductor photoelectric materials, Co 3 O 4 and SnO 2 are worthy of our attention because of their excellent optical and electrical properties in photocatalysis/electrocatalysis field applications, , such as transparent electrodes, gas sensors, supercapacitors, photocatalysts, and lithium-ion batteries . Our previous research has pointed out that Co 3 O 4 nanowire is suitable for basic materials of semiconductor heterostructures because nanowire morphology possesses large surface-to-volume ratios, better light trapping, enhanced charge separation efficacy, and a large surface area. − It should be noted that the morphology flexibility of SnO 2 (including nanorods, nanoribbons, nanotubes, nanosheets, hollow spheres, and nanoflowers) renders SnO 2 a suitable platform to interface with other materials into a functional device. The application of Co 3 O 4 /SnO 2 to construct integrated nanohybrids with targeted functionalities hardly found in the individual components for a PEC process is an exciting idea.…”

mentioning

confidence: 99%

Unveiling Hierarchical Dendritic Co₃O₄–SnO₂ Heterostructure for Efficient Water Purification

Jian

Liu

et al. 2023

Nano Lett.

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The construction of a desirable, environmentally friendly, and cost-effective nanoheterostructure photoanode to treat refractory organics is critical and challenging. Herein, we unveiled a hierarchical dendritic Co 3 O 4 −SnO 2 heterostructure via a sequential hydrothermal process. The time of the secondary hydrothermal process can control the size of the ultrathin SnO 2 nanosheets on the basis of the Ostwald solidification mass conservation principle. Ti/Co 3 O 4 −SnO 2 -168h with critical growth size demonstrated a photoelectrocatalysis degradation rate of ∼93.3% for a high dye concentrate of 90 mg/L with acceptable long-term cyclability and durability over reported Co 3 O 4 -based electrodes because of the large electrochemically active area, low charge transfer resistance, and high photocurrent intensity. To gain insight into the photoelectric synergy, we proposed a type-II heterojunction between Co 3 O 4 and SnO 2 , which prevents photogenerated carriers' recombination and improves the generation of dominant active species •O 2 − , 1 O 2 , and h + . This work uncovered the Ti/Co 3 O 4 −SnO 2 -168 as a promising catalyst and provided a simple and inexpensive assembly strategy to obtain binary integrated nanohybrids with targeted functionalities.

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Constructing S-scheme Co3O4-C3N4 catalyst with superior photoelectrocatalytic efficiency for water purification

Cited by 13 publications

References 62 publications

Designing advanced S‐scheme CdS QDs/La‐Bi₂WO₆ photocatalysts for efficient degradation of RhB

Designing advanced S‐scheme CdS QDs/La‐Bi₂WO₆ photocatalysts for efficient degradation of RhB

Photoelectrochemical Water Separation and Dye Degradation Catalyzed by g-C₃N₄/MoS₂ Nanosheets Doped with V²⁺ Metal Ions Coated on TiO₂ Nanorods

Unveiling Hierarchical Dendritic Co₃O₄–SnO₂ Heterostructure for Efficient Water Purification

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Constructing S-scheme Co3O4-C3N4 catalyst with superior photoelectrocatalytic efficiency for water purification

Cited by 13 publications

References 62 publications

Designing advanced S‐scheme CdS QDs/La‐Bi2WO6 photocatalysts for efficient degradation of RhB

Designing advanced S‐scheme CdS QDs/La‐Bi2WO6 photocatalysts for efficient degradation of RhB

Photoelectrochemical Water Separation and Dye Degradation Catalyzed by g-C3N4/MoS2 Nanosheets Doped with V2+ Metal Ions Coated on TiO2 Nanorods

Unveiling Hierarchical Dendritic Co3O4–SnO2 Heterostructure for Efficient Water Purification

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Designing advanced S‐scheme CdS QDs/La‐Bi₂WO₆ photocatalysts for efficient degradation of RhB

Designing advanced S‐scheme CdS QDs/La‐Bi₂WO₆ photocatalysts for efficient degradation of RhB

Photoelectrochemical Water Separation and Dye Degradation Catalyzed by g-C₃N₄/MoS₂ Nanosheets Doped with V²⁺ Metal Ions Coated on TiO₂ Nanorods

Unveiling Hierarchical Dendritic Co₃O₄–SnO₂ Heterostructure for Efficient Water Purification