CN/rGO@BPQDs high-low junctions with stretching spatial charge separation ability for photocatalytic degradation and H2O2 production

Xiong, Jie; Li, Xibao; Huang, Juntong; Gao, Xiaoming; Chen, Zhi; Liu, Jiyou; Li, Hai; Kang, Bangbang; Yao, Wenqing; Zhu, Yongfa

doi:10.1016/j.apcatb.2020.118602

Cited by 373 publications

(100 citation statements)

References 75 publications

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“…As shown in Fig. 4a,b, a porous two-dimensional nanosheet structure was formed, which is conducive to adsorb the pollutants 23 . In addition, the EDS spectrum (Fig.…”

Section: The Structure and Morphologymentioning

confidence: 99%

“…For example, the reduction of hexavalent chromium 6 , the degradation of benzene 7 , phenol, p-nitrophenol 8 , organic dye [9][10][11][12] , antibiotic 13,14 , and the photocatalytic antibacterial are typical representatives 15,16 . In addition, in the production of pollution-free new energy, photocatalysis is used to produce hydrogen [17][18][19][20][21][22] , oxygen, hydrogen peroxide 23,24 , CO2 photoreduction [25][26][27][28][29] , photocatalytic nitrogen fixation 30 , etc. Although photocatalysts have many advantages and are widely used, most of them have two fatal defects: low utilization of solar energy, and high recombination rate of photogenerated electron hole pairs [31][32][33] .…”

Section: Introductionmentioning

confidence: 99%

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All Organic S-Scheme Heterojunction PDI-Ala/S-C3N4 Photocatalyst with Enhanced Photocatalytic Performance

李喜宝¹,

刘积有²,

黄军同³

et al. 2020

Acta Physico Chimica Sinica

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Organic photocatalysts have attracted attention owing to their suitable redox band positions, low cost, high chemical stability, and good tunability of their framework and electronic structure. As a novel organic photocatalyst, PDI-Ala (N,N'-bis(propionic acid)-perylene-3,4,9,10tetracarboxylic diimide) has strong visible-light response, low valence band position, and strong oxidation ability. However, the low photogenerated charge transfer rate and high carrier recombination rate limit its application. Due to the aromatic heterocyclic structure of g-C3N4 and large delocalized π bond in the planar structure of PDI-Ala, g-C3N4 and PDI-Ala can be tightly combined through π-π interactions and N-C bond. The band structure of sulfur-doped g-C3N4 (S-C3N4) matched well with PDI-Ala than that with g-C3N4. The electron delocalization effect, internal electric field, and newly formed chemical bond jointly promote the separation and migration of photogenerated carriers between PDI-Ala and S-C3N4. To this end, a novel step-scheme (Sscheme) heterojunction photocatalyst comprising organic semiconductor PDI-Ala and S-C3N4 was prepared by an in situ self-assembly strategy. Meanwhile, PDI-Ala was self-assembled by transverse hydrogen bonding and longitudinal π-π stacking. The crystal structure, morphology, valency, optical properties, stability, and energy band structure of the PDI-Ala/S-C3N4 photocatalysts were systematically analyzed and studied by various characterization methods such as X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectrometry, X-ray photoelectron spectroscopy, ultraviolet visible diffuse reflectance spectroscopy, electrochemical impedance spectroscopy, and Mott-Schottky curve. The work functions and interface coupling characteristics were determined using density functional theory. The photocatalytic activities of the synthesized photocatalyst for H2O2 production and the degradation of tetracycline (TC) and p-nitrophenol (PNP) under visible-light irradiation are discussed. The PDI-Ala/S-C3N4 S-scheme heterojunction with band matching and tight interface bonding accelerates the intermolecular electron transfer and broadens the visible-light response range of the heterojunction. In addition, in the processes of the PDI-Ala/S-C3N4 photocatalytic degradation reaction, a variety of active species (h + , •O2 − , and H2O2) were produced and accumulated. Therefore, the PDI-Ala/S-C3N4 heterojunction exhibited enhanced photocatalytic performance in the degradation of TC, PNP, and H2O2 production. Under visible-light irradiation, the optimum 30%PDI-Ala/S-C3N4 removed 90% of TC within 90 min. In addition, 30%PDI-Ala/S-C3N4 displayed the highest H2O2 evolution rate of 28.3 μmol•h −1 •g −1 , which was 2.9 and 1.6 times higher than those of PDI-Ala and S-C3N4,

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“…As shown in Fig. 4a,b, a porous two-dimensional nanosheet structure was formed, which is conducive to adsorb the pollutants 23 . In addition, the EDS spectrum (Fig.…”

Section: The Structure and Morphologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

All Organic S-Scheme Heterojunction PDI-Ala/S-C3N4 Photocatalyst with Enhanced Photocatalytic Performance

李喜宝¹,

刘积有²,

黄军同³

et al. 2020

Acta Physico Chimica Sinica

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“…After the absorption equilibrium, the suspension solution was irradiated by the visible light with continuous stirring. At the given intervals, 5 mL of reaction mixture was centrifuged and then analyzed by recording variations of the maximum absorption spectra by UV1600 spectrometer [29]. Figure 2.…”

Section: Synthesis Of Tio 2 /Pd and Tio 2 /Pdo Hollow Spheresmentioning

confidence: 99%

Synthesis of TiO₂/Pd and TiO₂/PdO Hollow Spheres and Their Visible Light Photocatalytic Activity

Jun-ping

Jin

et al. 2020

International Journal of Photoenergy

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A series of TiO2, TiO2/Pd, and TiO2/PdO hollow sphere photocatalysts was successfully prepared via a combination of hydrothermal, sol-immobilization, and calcination methods. The structure and optical properties of the as-prepared samples were characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, Brunauer-Emmett-Telleranalysis, Barrett-Joyner-Halenda measurement, and UV-Vis diffuse reflectance spectroscopy. The photocatalysis efficiencies of all samples were evaluated through the photocatalytic degradation of rhodamine B under visible light irradiation. Results indicated that TiO2/PdO demonstrated a higher photocatalytic activity (the photocatalytic degradation efficiency could reach up to 100% within 40 min) than the other samples and could maintain a stable photocatalytic degradation efficiency for at least four cycles. Finally, after using different scavengers, superoxide and hydroxyl radicals were identified as the primary active species for the effectiveness of the TiO2/PdO photocatalyst.

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“…Many efforts have focused on the development of broadband response nanomaterials with spectrum response from the UV to the visible 10,[15][16][17][18][19][20][21][22][23][24] , even to the infrared (IR) region 18,20,[25][26][27][28][29] . Apart from the improvement in light absorption, increasing the photo-carrier transport and separation ability also is one of the most important ways to improve photocatalytic performance [30][31][32][33] .…”

Section: Introductionmentioning

confidence: 99%

Turbulence enhanced ferroelectric-nanocrystal-based photocatalysis in urchin-like TiO₂/BaTiO₃ microspheres for hydrogen evolution

Song

Zhang

et al. 2021

Nanoscale Adv.

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CN/rGO@BPQDs high-low junctions with stretching spatial charge separation ability for photocatalytic degradation and H2O2 production

Cited by 373 publications

References 75 publications

All Organic S-Scheme Heterojunction PDI-Ala/S-C<sub>3</sub>N<sub>4</sub> Photocatalyst with Enhanced Photocatalytic Performance

All Organic S-Scheme Heterojunction PDI-Ala/S-C<sub>3</sub>N<sub>4</sub> Photocatalyst with Enhanced Photocatalytic Performance

Synthesis of TiO₂/Pd and TiO₂/PdO Hollow Spheres and Their Visible Light Photocatalytic Activity

Turbulence enhanced ferroelectric-nanocrystal-based photocatalysis in urchin-like TiO₂/BaTiO₃ microspheres for hydrogen evolution

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CN/rGO@BPQDs high-low junctions with stretching spatial charge separation ability for photocatalytic degradation and H2O2 production

Cited by 373 publications

References 75 publications

All Organic S-Scheme Heterojunction PDI-Ala/S-C<sub>3</sub>N<sub>4</sub> Photocatalyst with Enhanced Photocatalytic Performance

All Organic S-Scheme Heterojunction PDI-Ala/S-C<sub>3</sub>N<sub>4</sub> Photocatalyst with Enhanced Photocatalytic Performance

Synthesis of TiO2/Pd and TiO2/PdO Hollow Spheres and Their Visible Light Photocatalytic Activity

Turbulence enhanced ferroelectric-nanocrystal-based photocatalysis in urchin-like TiO2/BaTiO3 microspheres for hydrogen evolution

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Synthesis of TiO₂/Pd and TiO₂/PdO Hollow Spheres and Their Visible Light Photocatalytic Activity

Turbulence enhanced ferroelectric-nanocrystal-based photocatalysis in urchin-like TiO₂/BaTiO₃ microspheres for hydrogen evolution