Z-scheme SnO2−x/g-C3N4 composite as an efficient photocatalyst for dye degradation and photocatalytic CO2 reduction

He, Yiming; Zhang, Lihong; Fan, Maohong; Wang, Xiaoxing; Walbridge, Mikel L.; Nong, Qingyan; Wu, Ying; Zhao, Leihong

doi:10.1016/j.solmat.2015.01.037

Cited by 383 publications

(157 citation statements)

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“…Therefore, potential of the photoinduced electron-hole pairs and the absorbed light can be fully utilized. For example, He et al reported SnO 2-x /g-C 3 N 4 composite as an efficient Z-scheme photocatalytic system [63]. By carrying out a series of radicals-trapping experiments, it was found that a Z-scheme photocatalytic system of SnO 2-x /g-C 3 N 4 was successfully created instead of conventional heterojunction-type photocatalytic system.…”

Section: Figmentioning

confidence: 99%

Carbon-based two-dimensional layered materials for photocatalytic CO 2 reduction to solar fuels

Low

Cheng

et al. 2016

Energy Storage Materials

191

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Section: Figmentioning

confidence: 99%

Carbon-based two-dimensional layered materials for photocatalytic CO 2 reduction to solar fuels

Low

Cheng

et al. 2016

Energy Storage Materials

191

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“…In the Z-scheme mechanism, the scavenging studies has been reported for various direct Z-scheme photocatalysts such as g-C 3 N 4 /TiO 2 , NaNbO 3 /WO 3 , WO 3 /g-C 3 N 4 , BiOCl/g-C 3 N 4 , Bi 2 O 3 /g-C 3 N 4 , Bi 2 O 3 /NaNbO 3 , BiVO 4 /g-C 3 N 4 , Ag 3 PO 4 /g-C 3 N 4 , SnO 2-x /g-C 3 N 4 and α-Fe 2 O 3 /Cu 2 O. [55][56][57][58][59][60][61][62][63][64] The PL analysis results further support the superior photocatalytic efficiency of the direct Z-scheme CIS/TNP photocatalysts (Figure 9). At 330 nm excitation (Figure 9), the PL intensities of the x%-CIS/TNP composites are lower than that of TNP indicating slower recombination rates.…”

Section: Photocatalytic Mechanismmentioning

confidence: 99%

Facile Synthesis of Novel Redox-Mediator-free Direct Z-Scheme CaIn₂S₄ Marigold-Flower-like/TiO₂ Photocatalysts with Superior Photocatalytic Efficiency

Natarajan

2015

ACS Appl. Mater. Interfaces

165

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Novel redox-mediator-free direct Z-scheme CaIn2S4 marigold-flower-like/TiO2 (CIS/TNP) photocatalysts with different CaIn2S4 weight percentages were synthesized using a facile wet-impregnation method. Uniform hierarchical marigold-flower-like CaIn2S4 (CIS) microspheres were synthesized using a hydrothermal method. Field-emission scanning electron microscopy and transmission electron microscopy analyses suggested that the formation and aggregation of nanoparticles, followed by the growth of petals or sheets and their subsequent self-assembly, led to the formation of the uniform hierarchical marigold-flower-like CIS structures. The photocatalytic degradation efficiency of the direct Z-scheme CIS/TNP photocatalysts was evaluated through the degradation of the pharmaceutical compounds isoniazid (ISN) and metronidazole (MTZ). The direct Z-scheme CaIn2S4 marigold-flower-like/TiO2 (1%-CIS/TNP) photocatalyst showed enhanced performance in the ISN (71.9%) and MTZ (86.5%) photocatalytic degradations as compared to composites with different CaIn2S4 contents or the individual TiO2 and CaIn2S4. A possible enhancement mechanism based on the Z-scheme formed between the CIS and TNP for the improved photocatalytic efficiency was also proposed. The recombination rate of the photoinduced charge carriers was significantly suppressed for the direct Z-scheme CIS/TNP photocatalyst, which was confirmed by photoluminescence analysis. Radical-trapping studies revealed that photogenerated holes (h+), •OH, and O2•- are the primary active species, and suggested that the enhanced photocatalytic efficiency of the 1%-CIS/TNP follows the Z-scheme mechanism for transferring the charge carriers. It was further confirmed by hydroxyl (•OH) radical determination via fluorescence techniques revealed that higher concentration of •OH radical were formed over 1%-CIS/TNP than over bare CIS and TNP. The separation of the charge carriers was further confirmed using photocurrent and electron spin resonance measurements. Kinetic and chemical oxygen demand analyses were performed to confirm the ISN and MTZ degradation. The results demonstrated that the direct Z-scheme CIS/TNP photocatalyst shows superior decomposition efficiency for the degradation of these pharmaceuticals under the given reaction conditions.

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“…In heterojunction the accumulated holes in the valence band (VB) of CN cannot oxidize the surface hydroxyl (-OH) groups to hydroxyl radicals ( • OH), because the VB position of CN has a lower positive potential (+1.575 eV) than that required for the oxidation of -OH groups (-OH/ • OH = +2.4 eV). To surmount this, development of Z-scheme based photocatalysts has aroused increased attention due to its efficient separation of photogenerated electron-hole pairs in two different semiconductors [21][22][23][24][25]. Yu et al [26] revealed a direct Z-scheme-based photocatalytic mechanism in CN/TiO 2 photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Influence of TiO2 morphology on the photocatalytic efficiency of direct Z-scheme g-C3N4/TiO2 photocatalysts for isoniazid degradation

Natarajan

2015

Chemical Engineering Journal

326

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Z-scheme SnO2−x/g-C3N4 composite as an efficient photocatalyst for dye degradation and photocatalytic CO2 reduction

Cited by 383 publications

References 50 publications

Carbon-based two-dimensional layered materials for photocatalytic CO 2 reduction to solar fuels

Carbon-based two-dimensional layered materials for photocatalytic CO 2 reduction to solar fuels

Facile Synthesis of Novel Redox-Mediator-free Direct Z-Scheme CaIn₂S₄ Marigold-Flower-like/TiO₂ Photocatalysts with Superior Photocatalytic Efficiency

Influence of TiO2 morphology on the photocatalytic efficiency of direct Z-scheme g-C3N4/TiO2 photocatalysts for isoniazid degradation

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Z-scheme SnO2−x/g-C3N4 composite as an efficient photocatalyst for dye degradation and photocatalytic CO2 reduction

Cited by 383 publications

References 50 publications

Carbon-based two-dimensional layered materials for photocatalytic CO 2 reduction to solar fuels

Carbon-based two-dimensional layered materials for photocatalytic CO 2 reduction to solar fuels

Facile Synthesis of Novel Redox-Mediator-free Direct Z-Scheme CaIn2S4 Marigold-Flower-like/TiO2 Photocatalysts with Superior Photocatalytic Efficiency

Influence of TiO2 morphology on the photocatalytic efficiency of direct Z-scheme g-C3N4/TiO2 photocatalysts for isoniazid degradation

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Facile Synthesis of Novel Redox-Mediator-free Direct Z-Scheme CaIn₂S₄ Marigold-Flower-like/TiO₂ Photocatalysts with Superior Photocatalytic Efficiency