P-Doped g-C&lt;sub&gt;3&lt;/sub&gt;N&lt;sub&gt;4&lt;/sub&gt; Nanosheets with Highly Dispersed Co&lt;sub&gt;0.2&lt;/sub&gt;Ni&lt;sub&gt;1.6&lt;/sub&gt;Fe&lt;sub&gt;0.2&lt;/sub&gt;P Cocatalyst for Efficient Photocatalytic Hydrogen Evolution

沈荣晨,; 郝磊,; 陈晴,; 郑巧清,; 张鹏,; 李鑫,

doi:10.3866/pku.whxb202110014

Cited by 20 publications

(20 citation statements)

References 62 publications

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“…By view of the high toxicity, solubility, persistence, and carcinogenicity of persistent organic pollutants from industrial or urban areas in the aquatic ecosystem, the treatment of organic pollutants in water has become an urgent environmental problem [1][2][3] . As one of the most commonly used antibiotics in livestock and aquaculture, tetracycline is often detected in natural water [4][5][6] . Therefore, it is urgent to find a technique for efficient tetracycline degradation.…”

Section: Introductionmentioning

confidence: 99%

Efficient Degradation of Tetracycline via Coupling of Photocatalysis and Photo-Fenton Processes over a 2D/2D α-Fe2O3/g-C3N4 S-scheme Heterojunction Catalyst

Wang¹,

Zhang²,

Chen³

et al. 2022

Acta Physico Chimica Sinica

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Graphitic carbon nitride (g-C3N4) has been widely used as a potential photocatalytic material for the removal of tetracycline from water. However, the poor visible light absorption ability and high recombination rate of the photogenerated charge significantly inhibit the catalytic activity of g-C3N4. Therefore, facile methods to improve the photocatalytic efficiency of g-C3N4 need to be developed. Hematite (α-Fe2O3), which has a good visible light absorption and corrosion resistance, is often used for photocatalysis and photo-Fenton reactions. Therefore, a two-dimension/two-dimension (2D/2D) S-scheme heterojunction constructed of g-C3N4 and α-Fe2O3 nanosheets could be expected to improve the degradation efficiency of tetracycline. In this study, 2D/2D Sscheme α-Fe2O3/g-C3N4 photo-Fenton catalysts were prepared using a hydrothermal strategy. The photo-Fenton catalytic activity of α-Fe2O3/g-C3N4 (α-Fe2O3 50% (w)) was significantly improved by the addition of a small amount of H2O2, removing 78% of tetracycline within 20 min, which was approximately 3.5 and 5.8 times the removal achieved using α-Fe2O3 and g-C3N4, respectively. The high catalytic activity was attributed to the synergy between the photocatalysis and Fenton reaction promoted by the continuous Fe 3+ /Fe 2+ conversion over the 2D/2D S-scheme heterojunction. The 2D/2D S-scheme heterojunction was crucial in the fabrication of the α-Fe2O3/g-C3N4 photocatalyst with a large surface area, adequate active sites, and strong oxidation-reduction capability. Furthermore, the photo-Fenton reaction provided additional hydroxyl radicals for the degradation of tetracycline with the aid of H2O2. The excess reaction product (Fe 3+ ) was reduced to Fe 2+ by the photogenerated electrons from the conduction band of α-Fe2O3. The resulting Fe 2+ could participate in the photo-Fenton reaction. The morphological structures of α-Fe2O3/g-C3N4 were analyzed using transmission electron microscopy to demonstrate the formation of a 2D/2D structure with face-to-face contact, and the optical properties of the composites were measured using ultraviolet-visible diffuse reflectance spectroscopy. α-Fe2O3/g-C3N4 possessed a significantly improved visible light absorption compared to g-C3N4. Five sequential cyclic degradation tests and X-ray diffraction (XRD) patterns obtained before and after the reaction showed that the α-Fe2O3/g-C3N4 composites possessed stable photo-Fenton catalytic activity and crystal structures. Transient photocurrent responses of α-Fe2O3/g-C3N4 demonstrated that the prepared composites exhibited a higher charge transfer efficiency compared to that of single α-Fe2O3 and g-C3N4. In addition, according to the photoluminescence analysis and active species trapping experiments, a possible S-scheme heterojunction charge transfer process in the photo-Fenton catalytic reaction was proposed. This study provided a promising method for the construction of a high-performance photo-Fenton catalytic system to remove antibiotics from wastewater.

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Section: Introductionmentioning

confidence: 99%

Efficient Degradation of Tetracycline via Coupling of Photocatalysis and Photo-Fenton Processes over a 2D/2D α-Fe2O3/g-C3N4 S-scheme Heterojunction Catalyst

Wang¹,

Zhang²,

Chen³

et al. 2022

Acta Physico Chimica Sinica

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“…Photocatalysis has excellent potential to alleviate the energy crisis and global environmental pollution and has been extensively researched to exploit solar energy. − Although photocatalytic performance has progressed considerably in recent decades, it still does not meet the needs of industrial applications . The biggest obstacle is the low solar energy conversion rate. , It is well-known that the solar spectrum can be divided into three main parts, with the ultraviolet region accounting for about 7%, the visible region accounting for about 43%, and the near-infrared region accounting for about 50% .…”

Section: Introductionmentioning

confidence: 99%

Urchinlike Carbon-Coated TiO₂ Microspheres with Enhanced Photothermal–Photocatalytic Hydrogen Evolution Performance for Full-Spectrum Solar Energy Conversion

et al. 2022

Ind. Eng. Chem. Res.

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Although carbon-based nanocomposites exhibit excellent photocatalytic properties, the role played by the photothermal effect of carbon-based nanocomposites is frequently underestimated. Herein, we report the preparation of carbon coated urchinlike TiO2 microspheres (TiO2@CS) via a facile one-step solvothermal method for photothermal and photocatalytic hydrogen evolution. Carbon microspheres as the substrate, coated with TiO2 nanorods, can absorb near-infrared energy and increase the surface temperature of TiO2@CS, enhancing the photothermal effect. The photothermal catalytic hydrogen generation activity of the optimized catalyst is 5.1 times higher than that of the sum of the photocatalytic and thermocatalytic reactions. The excellent hydrogen production rate is attributed to the synergistic effect of electron mobility and surface temperature. The presence of carbon microspheres expands the light absorption and effectively transfers and separates photogenerated carriers, hence significantly improving the photocatalytic efficiency. We demonstrate that the design of carbon-based nanocomposites with better photothermal properties is a promising approach to obtain significantly enhanced photocatalytic activity.

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“…Currently, graphitic carbon nitride (g-C 3 N 4 , CN) is often used to catalyze water splitting or CO 2 reduction due to its advantages including ample nitrogencontaining precursors, a facile preparation, an applicable band potential, and high structural stability. [4][5][6][7][8][9][10][11][12] But, the photocatalytic performance of pristine CN is unsatisfactory owing to its high quenching chance of electron-hole pairs and poor light absorption. Thus, many strategies have been developed to accelerate charge separation and increase light absorption with the goal of enhancing photocatalytic redox reaction.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, many strategies have been developed to accelerate charge separation and increase light absorption with the goal of enhancing photocatalytic redox reaction. [7][8][9][10][11][12][13][14][15][16] Charge migration in CN nanosheets is anisotropic due to the sp 2 (p) p-conjugation structure, confining charge transfer to the nanosheet plane. 17 To induce rapid charge transfer carrier and separation, methods such as the creation of carbon/nitrogen vacancies 15,18 and intramolecular doping have been employed to narrow the bandgap of CN, generate active sites, and change the charge density of CN.…”

Section: Introductionmentioning

confidence: 99%

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Molecular engineering of g-C₃N₄ with spatial charge separation for enhancing photocatalytic performances

Guo

Chen

et al. 2022

Mater. Chem. Front.

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P-Doped g-C<sub>3</sub>N<sub>4</sub> Nanosheets with Highly Dispersed Co<sub>0.2</sub>Ni<sub>1.6</sub>Fe<sub>0.2</sub>P Cocatalyst for Efficient Photocatalytic Hydrogen Evolution

Cited by 20 publications

References 62 publications

Efficient Degradation of Tetracycline <i>via</i> Coupling of Photocatalysis and Photo-Fenton Processes over a 2D/2D α-Fe<sub>2</sub>O<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> S-scheme Heterojunction Catalyst

Efficient Degradation of Tetracycline <i>via</i> Coupling of Photocatalysis and Photo-Fenton Processes over a 2D/2D α-Fe<sub>2</sub>O<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> S-scheme Heterojunction Catalyst

Urchinlike Carbon-Coated TiO₂ Microspheres with Enhanced Photothermal–Photocatalytic Hydrogen Evolution Performance for Full-Spectrum Solar Energy Conversion

Molecular engineering of g-C₃N₄ with spatial charge separation for enhancing photocatalytic performances

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P-Doped g-C<sub>3</sub>N<sub>4</sub> Nanosheets with Highly Dispersed Co<sub>0.2</sub>Ni<sub>1.6</sub>Fe<sub>0.2</sub>P Cocatalyst for Efficient Photocatalytic Hydrogen Evolution

Cited by 20 publications

References 62 publications

Efficient Degradation of Tetracycline <i>via</i> Coupling of Photocatalysis and Photo-Fenton Processes over a 2D/2D α-Fe<sub>2</sub>O<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> S-scheme Heterojunction Catalyst

Efficient Degradation of Tetracycline <i>via</i> Coupling of Photocatalysis and Photo-Fenton Processes over a 2D/2D α-Fe<sub>2</sub>O<sub>3</sub>/g-C<sub>3</sub>N<sub>4</sub> S-scheme Heterojunction Catalyst

Urchinlike Carbon-Coated TiO2 Microspheres with Enhanced Photothermal–Photocatalytic Hydrogen Evolution Performance for Full-Spectrum Solar Energy Conversion

Molecular engineering of g-C3N4 with spatial charge separation for enhancing photocatalytic performances

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Product

Resources

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Urchinlike Carbon-Coated TiO₂ Microspheres with Enhanced Photothermal–Photocatalytic Hydrogen Evolution Performance for Full-Spectrum Solar Energy Conversion

Molecular engineering of g-C₃N₄ with spatial charge separation for enhancing photocatalytic performances