Construction of g-C3N4/TiO2 nanotube arrays Z-scheme heterojunction to improve visible light catalytic activity

Bi, Xiaojian; Yu, Shou-Wen; Liu, Enyang; Liu, Lin; Zhang, Kai; Zang, Jie; Zhao, Yan

doi:10.1016/j.colsurfa.2020.125193

Cited by 49 publications

(16 citation statements)

References 31 publications

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“…However, with the content of g-C3N4 in g-C3N4/TiO2 being in excess, numerous photo-induced electrons and holes would recombine easily. Therefore, the 0.5CNS/TiO2 sample displayed the best photocatalytic performance In order to describe the photocatalytic mechanism of 0.5CNS/TiO 2 for the degradation of IMI, the CB and VB edge potentials of g-C 3 N 4 and TiO 2 were calculated from Equations ( 2) and (3) [66].…”

Section: Photocatalytic Mechanismmentioning

confidence: 99%

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Identification of Active Species in Photodegradation of Aqueous Imidacloprid over g-C3N4/TiO2 Nanocomposites

et al. 2022

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In this work, g-C3N4/TiO2 composites were fabricated through a hydrothermal method for the efficient photocatalytic degradation of imidacloprid (IMI) pesticide. The composites were fabricated at varying loading of sonochemically exfoliated g-C3N4 (denoted as CNS). Complementary characterization results indicate that the heterojunction between the CNS and TiO2 formed. Among the composites, the 0.5CNS/TiO2 material gave the highest photocatalytic activity (93% IMI removal efficiency) under UV-Vis light irradiation, which was 2.2 times over the pristine g-C3N4. The high photocatalytic activity of the g-C3N4/TiO2 composites could be ascribed to the band gap energy reduction and suppression of photo-induced charge carrier recombination on both TiO2 and CNS surfaces. In addition, it was found that the active species involved in the photodegradation process are OH and holes, and a possible mechanism was proposed. The g-C3N4/TiO2 photocatalysts exhibited stable photocatalytic performance after regeneration, which shows that g-C3N4/TiO2 is a promising material for the photodegradation of imidacloprid pesticide in wastewater.

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Section: Photocatalytic Mechanismmentioning

confidence: 99%

“…where X is the absolute electronegativity of the atom semiconductor, and the X values of TiO 2 and g-C 3 N 4 are 5.8 eV and 4.73 eV, respectively [66]. E c is the energy of free electrons of the hydrogen scale (4.5 Ev).…”

Section: Photocatalytic Mechanismmentioning

confidence: 99%

Identification of Active Species in Photodegradation of Aqueous Imidacloprid over g-C3N4/TiO2 Nanocomposites

et al. 2022

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“…The nanocomposite oxidized 96.3% of rhodamine B pollutant at a rate constant of 0.0195 min −1 and demonstrated excellent stability and reusability. [ 16 ] Recently, rare‐earth elements have been identified as key elements for improving the photocatalysis of semiconductors due to their rich energy level structures and unique photoelectric properties. In particular, Sm doping introduced impurity energy levels into band gaps and accelerated the separation of electron–hole pairs in semiconductors, thus expanding their optical response range to the visible light region.…”

Section: Introductionmentioning

confidence: 99%

“…However, the wide band gap of TiO 2 (anatase TiO 2 : 3.2 eV, rutile TiO 2 : 3.0 eV) allows the photocatalyst to absorb only a narrow range of solar light, restricting its application. [15][16][17][18] Therefore, novel techniques are required to reduce the limitations of TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of Sm‐TiO₂ coupled with g‐C₃N₄ for improved photocatalytic degradation toward methylene blue and tetracycline under visible‐light irradiation

Cui

Zhang

Yan

et al. 2022

Applied Organom Chemis

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Owing to the great harm that water pollution has caused to the natural environment, the effective treatment of sewage is crucial. In this study, Sm-TiO 2 /g-C 3 N 4 composites were synthesized for the degradation of MB and TC pollutants. The experimental results showed that up to 91.8% and 93.3% of MB and TC pollutants were removed within 120 min of illumination, which were 2.8 and 2.3 times greater than that of pure TiO 2 , respectively, showing the good optical properties of the composites. Due to the coupling between Sm-TiO 2 and g-C 3 N 4 , the separation of photogenerated electron holes is accelerated, thereby enhancing the photocatalytic activity of the composites. This not only enabled the strong redox ability of TiO 2 to be retained, but also effectively promoted electron migration, thus improving the photocatalytic activity of the composites.

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“…Therefore, several approaches have been used to enhance the visible light absorption of g-C 3 N 4 . For instance, g-C 3 N 4 has been modified by doping with metal or nonmetal ions [17][18][19][20], forming heterojunctions [21][22][23][24][25][26], and being photosensitized with dyes [27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

g-C3N4 Sensitized by an Indoline Dye for Photocatalytic H2 Evolution

Chen

Liu

2021

Processes

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Protonated g-C3N4 (pCN) formed by treating bulk g-C3N4 with an aqueous HCl solution was modified with D149 dye, i.e., 5-[[4[4-(2,2-diphenylethenyl) phenyl]-1,2,3,3a,4,8b-hexahydrocyclopent[b]indol-7-yl] methylene]-2-(3-ethyl-4-oxo-2-thioxo-5-thiazolidinylidene)-4-oxo-thiazolidin-2-ylidenerhodanine, for photocatalytic water splitting (using Pt as a co-catalyst). The D149/pCN-Pt composite showed a much higher rate (2138.2 µmol·h−1·g−1) of H2 production than pCN-Pt (657.0 µmol·h−1·g−1). Through relevant characterization, the significantly high activity of D149/pCN-Pt was linked to improved absorption of visible light, accelerated electron transfer, and more efficient separation of charge carriers. The presence of both D149 and Pt was found to be important for these factors. A mechanism was proposed.

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Construction of g-C3N4/TiO2 nanotube arrays Z-scheme heterojunction to improve visible light catalytic activity

Cited by 49 publications

References 31 publications

Identification of Active Species in Photodegradation of Aqueous Imidacloprid over g-C3N4/TiO2 Nanocomposites

Identification of Active Species in Photodegradation of Aqueous Imidacloprid over g-C3N4/TiO2 Nanocomposites

Synthesis and properties of Sm‐TiO₂ coupled with g‐C₃N₄ for improved photocatalytic degradation toward methylene blue and tetracycline under visible‐light irradiation

g-C3N4 Sensitized by an Indoline Dye for Photocatalytic H2 Evolution

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Construction of g-C3N4/TiO2 nanotube arrays Z-scheme heterojunction to improve visible light catalytic activity

Cited by 49 publications

References 31 publications

Identification of Active Species in Photodegradation of Aqueous Imidacloprid over g-C3N4/TiO2 Nanocomposites

Identification of Active Species in Photodegradation of Aqueous Imidacloprid over g-C3N4/TiO2 Nanocomposites

Synthesis and properties of Sm‐TiO2 coupled with g‐C3N4 for improved photocatalytic degradation toward methylene blue and tetracycline under visible‐light irradiation

g-C3N4 Sensitized by an Indoline Dye for Photocatalytic H2 Evolution

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Synthesis and properties of Sm‐TiO₂ coupled with g‐C₃N₄ for improved photocatalytic degradation toward methylene blue and tetracycline under visible‐light irradiation