Visible-light activation of persulfate by TiO2/g-C3N4 photocatalyst toward efficient degradation of micropollutants

Du, Xinyu; Bai, Xue; Xu, Likun; Yang, Lei; Jin, Pengkang

doi:10.1016/j.cej.2019.123245

Cited by 324 publications

(98 citation statements)

References 83 publications

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“…3(a) and (b)] display interplanar spacings of TiO 2 and HCCN of 0.35 and 0.33 nm, corresponding to the (101) planes and (002) planes respectively. 33,34 Moreover, it can be seen that the TiO 2 NPs are distributed on the surface of HCCN, as exhibited in Fig. 3(c).…”

Section: Resultsmentioning

confidence: 80%

Fabrication of TiO₂/high‐crystalline g‐C₃N₄ composite with enhanced visible‐light photocatalytic performance for tetracycline degradation

Guo

Sun

Huang

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND The construction of heterojunction between two‐phase semiconductors is a crucial tactic to enhance photocatalytic activity due to its efficient charge separation. RESULT In this work, a novel TiO2/high‐crystalline g‐C3N4 (HCCN) heterojunction photocatalyst was synthesized successfully via a simply hydrothermal method, which was composed of TiO2 nanoparticles distributed on the surface of the HCCN nanosheets. The microstructure and morphology of TiO2/HCCN heterojunction were investigated by various characteristic techniques (such as X‐ray diffraction, transmission electron microscopy and Fourier transform infrared). The photocatalytic performance of as‐prepared photocatalysts was tested though the degradation of tetracycline (10 mg L−1) under visible light irradiation (λ > 420 nm). Significantly, the 50% TiO2/HCCN composite photocatalyst (mass fraction of TiO2 is 50%) exhibited the optimum photocatalytic activity (90%, 120 min), and the corresponding reaction rate constant was around 12 times and 54 times higher than those of pristine HCCN and TiO2, respectively. CONCLUSION The excellent photocatalytic performance was attributed mainly to the synergistic effect of the TiO2/HCCN heterojunction as follows: (i) enhanced light absorption capacity; (ii) improved separation and migration of electron–hole pairs; (iii) extended lifetime of photogenerated carriers. This current study extends our knowledge towards constructing other HCCN‐based nanocomposites with extraordinary photocatalytic performance for addressing environmental problems. © 2020 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 80%

Fabrication of TiO₂/high‐crystalline g‐C₃N₄ composite with enhanced visible‐light photocatalytic performance for tetracycline degradation

Guo

Sun

Huang

et al. 2020

J of Chemical Tech & Biotech

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“…The N 2 fixation yield in the visible area was less than 67%, due to the re-oxidation of intermediates and products by the pores in the deep valence band of TiO 2 and weak absorption on the surface of reactant. In addition, the work function of TiO 2 is 4.6 eV, which means electrons jumped to above the conduction band with barrier [ 60 , 61 , 62 , 63 ]. Other wide bandgap semiconductors such as GaN, SiC, due to lower potential energy, have more difficulty for the photocatalyst [ 56 , 64 , 65 ].…”

Section: Discussionmentioning

confidence: 99%

Visible-Light Activation of Photocatalytic for Reduction of Nitrogen to Ammonia by Introducing Impurity Defect Levels into Nanocrystalline Diamond

Liu

Abbasi

et al. 2020

Materials

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Nitrogen impurity has been introduced in diamond film to produce a nitrogen vacancy center (NV center) toward the solvated electron-initiated reduction of N2 to NH3 in liquids, giving rise to extend the wavelength region beyond the diamond’s band. Scanning electron microscopy and X-ray diffraction demonstrate the formation of the nanocrystalline nitrogen-doped diamond with an average diameter of ten nanometers. Raman spectroscopy and PhotoLuminescence (PL) spectrum show characteristics of the NV0 and NV− charge states. Measurements of photocatalytic activity using supraband (λ < 225 nm) gap and sub-band gap (λ > 225 nm) excitation show the nitrogen-doped diamond significantly enhanced the ability to reduce N2 to NH3 compared to the polycrystalline diamond and single crystal diamond (SCD). Our results suggest an important process of internal photoemission, in which electrons are excited from negative charge states into conduction band edges, presenting remarkable photoinitiated electrons under ultraviolet and visible light. Other factors, including transitions between defect levels and processes of reaction, are also discussed. This approach can be especially advantageous to such as N2 and CO2 that bind only weakly to most surfaces and high energy conditions.

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“…The TiO 2 /g-C 3 N 4 composite was fabricated for paracetamol photocatalytic degradation in the presence of visible light and persulfate. As prepared composite held type II heterojunction, which inhibits the electron-hole recombination in photocatalyst and adding persulfate increased 13 times degradation rate [94]. Liang et al prepared porous 0D/3D NiCo 2 O 4 /g-C 3 N 4 composite for carbamazepine removal.…”

Section: Photo-assisted Sulfate Radical Based Aopsmentioning

confidence: 99%

Graphitic Carbon Nitride-Based Composite in Advanced Oxidation Processes for Aqueous Organic Pollutants Removal: A Review

2020

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In recent decades, a growing number of organic pollutants released have raised worldwide concern. Graphitic carbon nitride (g-C3N4) has drawn increasing attention in environmental pollutants removal thanks to its unique electronic band structure and excellent physicochemical stability. This paper reviews the recent progress of g-C3N4-based composites as catalysts in various advanced oxidation processes (AOPs), including chemical, photochemical, and electrochemical AOPs. Strategies for enhancing catalytic performance such as element-doping, nanostructure design, and heterojunction construction are summarized in detail. The catalytic degradation mechanisms are also discussed briefly.

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Visible-light activation of persulfate by TiO2/g-C3N4 photocatalyst toward efficient degradation of micropollutants

Cited by 324 publications

References 83 publications

Fabrication of TiO₂/high‐crystalline g‐C₃N₄ composite with enhanced visible‐light photocatalytic performance for tetracycline degradation

Fabrication of TiO₂/high‐crystalline g‐C₃N₄ composite with enhanced visible‐light photocatalytic performance for tetracycline degradation

Visible-Light Activation of Photocatalytic for Reduction of Nitrogen to Ammonia by Introducing Impurity Defect Levels into Nanocrystalline Diamond

Graphitic Carbon Nitride-Based Composite in Advanced Oxidation Processes for Aqueous Organic Pollutants Removal: A Review

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Visible-light activation of persulfate by TiO2/g-C3N4 photocatalyst toward efficient degradation of micropollutants

Cited by 324 publications

References 83 publications

Fabrication of TiO2/high‐crystalline g‐C3N4 composite with enhanced visible‐light photocatalytic performance for tetracycline degradation

Fabrication of TiO2/high‐crystalline g‐C3N4 composite with enhanced visible‐light photocatalytic performance for tetracycline degradation

Visible-Light Activation of Photocatalytic for Reduction of Nitrogen to Ammonia by Introducing Impurity Defect Levels into Nanocrystalline Diamond

Graphitic Carbon Nitride-Based Composite in Advanced Oxidation Processes for Aqueous Organic Pollutants Removal: A Review

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Fabrication of TiO₂/high‐crystalline g‐C₃N₄ composite with enhanced visible‐light photocatalytic performance for tetracycline degradation

Fabrication of TiO₂/high‐crystalline g‐C₃N₄ composite with enhanced visible‐light photocatalytic performance for tetracycline degradation