Mesoporous TiO2@g-C3N4 composite: construction, characterization, and boosting indigo carmine dye destruction

Toghan, Arafat; El‐Lateef, Hany M. Abd; Taha, Kamal K.; Modwi, A.

doi:10.1016/j.diamond.2021.108491

Cited by 60 publications

(18 citation statements)

References 91 publications

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“…Firstly, the conduction band (CB) and valence band (VB) potentials of TiO 2 and g-C 3 N 4 were obtained using Eqs. (4) and (5) , respectively [ 53 ]:

where Χ, E C , E g , E CB, and E VB are the absolute electronegativity of semiconductors (Χ for g-C 3 N 4 ∼ 4.72 and TiO 2 ∼ 5.81), the energy of free electrons on the hydrogen scale (∼4.5 eV), the energy band gap of the photocatalyst, CB potential and VB potential, respectively. The estimated CB and VB potentials for TiO 2 and g-C 3 N 4 are −0.3 eV and 2.9 eV, −1.1 eV and 1.6 eV, respectively.…”

Section: Resultsmentioning

confidence: 99%

TiO2-modified g-C3N4 nanocomposite for photocatalytic degradation of organic dyes in aqueous solution

Madima

Kefeni

Mishra

et al. 2022

Heliyon

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“…Firstly, the conduction band (CB) and valence band (VB) potentials of TiO 2 and g-C 3 N 4 were obtained using Eqs. (4) and (5) , respectively [ 53 ]:

Section: Resultsmentioning

confidence: 99%

TiO2-modified g-C3N4 nanocomposite for photocatalytic degradation of organic dyes in aqueous solution

Madima

Kefeni

Mishra

et al. 2022

Heliyon

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“…Moreover, according to the empirical equation: E CB = X − E e − 0.5 E g and E VB = E g − E CB , where X is the absolute electronegativity of the semiconductor (5.609 eV for LFCO), E e is the free electron energy versus hydrogen scale (4.5 eV), E g is the band gap (2.24 eV) of the semiconductor determined by the Kubelka–Munk equation. [ 10,40 ] The obtained E CB and E VB are −0.01 and 2.23 eV, respectively.…”

Section: Resultsmentioning

confidence: 96%

“…For example, g‐C 3 N 4 has a light absorption spectrum broader than TiO 2 but exhibits faster e − /h + recombination rate. [ 10 ] Construction of Z‐scheme heterojunctions could be a way to solve this contradiction, as the heterojunctions can not only retain the broad absorption spectrum range but also improve the e − /h + utilization efficiency by sacrificing the useless e − /h + .…”

Section: Introductionmentioning

confidence: 99%

“…For example, g-C 3 N 4 has a light absorption spectrum broader than TiO 2 but exhibits faster e − /h + recombination rate. [10] Construction of Z-scheme heterojunctions could be a way to solve this contradiction, as the heterojunctions can not only retain the broad absorption spectrum range but also improve the e − /h + utilization efficiency by sacrificing the useless e − /h + . g-C 3 N 4 is a good material to be used in heterojunctions, as it can be easily coupled with other semiconductors due to its polymeric properties, either by in situ synthesis or by post-mixing.…”

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confidence: 99%

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Construction of Ag‐Bridged Z‐Scheme LaFe_0.5Co_0.5O₃/Ag₁₀/Graphitic Carbon Nitride Heterojunctions for Photo‐Fenton Degradation of Tetracycline Hydrochloride: Interfacial Electron Effect and Reaction Mechanism

Lin

Xiao

et al. 2022

Adv Materials Inter

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Improvements on spectral absorption range and electron–hole (e−/h+) separation efficiency are crucial to effectively design materials for photocatalysis. To reach this objective, ternary Z‐scheme LaFe0.5Co0.5O3/Ag10/graphitic carbon nitride (LFCO/Ag10/g‐CN) heterojunctions with layered structure are designed. The obtained results show that: 1) the Ag nanoparticles (NPs) act as bridges to link LFCO and g‐CN, providing a place for recombination of useless electrons and holes; 2) some of the Ag atoms enter the LFCO lattice as Ag+, but most of them are at the surface in the form of Ag NPs, while g‐CN coats the surface of LFCO/Ag10 as a thin film; 3) LFCO/Ag10/g‐CN exhibits improved e−/h+ separation efficiency, electron transfer rate, and photocurrent response, compared to g‐CN and LFCO/Ag10 alone. Catalytic tests show that LFCO/Ag10/g‐CN is active for photo‐Fenton degradation of tetracycline hydrochloride (TC), with 87% TC conversion obtained at 40 min. Mechanistic studies show that •O2− and •OH radicals are the reactive species of the reaction, and a synergistic effect between light and H2O2 is produced by generating extra •OH radicals. LFCO/Ag10/g‐CN is also highly stable in the reaction conditions, with no appreciable activity loss up to four reuse cycles.

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“…On the other hand, nanocomposites play an important role in environmental remediation as scavengers of water contaminants via adsorption or ion exchange [19,20]. Tremendous efforts have been devoted in order to obtain nanocomposites with distinctive characteristics through alloying and doping [21,22].…”

Section: Introductionmentioning

confidence: 99%

Efficient Removal of Cd (II) from Aquatic Media by Heteronanostructure MgO@TiO₂@g‐C₃N₄

Modwi

Ismail

Idriss

et al. 2022

Journal of Nanomaterials

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MgO@TiO2@g-C3N4 heteronanostructure was synthesized using a simple ultrasonication technique and assessed potentially to remove Cd (II) from aqueous environments. X-ray diffraction analysis confirms composite formation with mean crystallite size in the range of 4-17 nm while transmission electron microscopy analysis reveals nanosheet-like nanoparticles with the homogeneous elemental distribution. N2 adsorption-desorption measurements indicate the formation of a mesoporous structure with a BET surface area of about 107 m2/g. Fourier-transformed infrared elucidates the presence of O–H, amino groups, triazine, Mg–O, and Ti–O vibrations modes. At the same time, X-ray photoelectron spectroscopy analysis manifests the presence of Mg, O, N, Ti, and C elements. For aqueous Cd (II) ions, the MgO@TiO2@g-C3N4 nanostructure displays a superior adsorption efficiency, reaching 99.94% Cd (II) elimination with an optimum adsorption capacity of 515.86 mg/g in a short duration of 16 min. This study demonstrates the capability of using the MgO@TiO2@g-C3N4 nanostructure as an efficient and reusable adsorbent for the uptake of Cd (II) ions in wastewater treatment and potentially for the removal of other heavy metal ions.

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Mesoporous TiO2@g-C3N4 composite: construction, characterization, and boosting indigo carmine dye destruction

Cited by 60 publications

References 91 publications

TiO2-modified g-C3N4 nanocomposite for photocatalytic degradation of organic dyes in aqueous solution

TiO2-modified g-C3N4 nanocomposite for photocatalytic degradation of organic dyes in aqueous solution

Construction of Ag‐Bridged Z‐Scheme LaFe_0.5Co_0.5O₃/Ag₁₀/Graphitic Carbon Nitride Heterojunctions for Photo‐Fenton Degradation of Tetracycline Hydrochloride: Interfacial Electron Effect and Reaction Mechanism

Efficient Removal of Cd (II) from Aquatic Media by Heteronanostructure MgO@TiO₂@g‐C₃N₄

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Mesoporous TiO2@g-C3N4 composite: construction, characterization, and boosting indigo carmine dye destruction

Cited by 60 publications

References 91 publications

TiO2-modified g-C3N4 nanocomposite for photocatalytic degradation of organic dyes in aqueous solution

TiO2-modified g-C3N4 nanocomposite for photocatalytic degradation of organic dyes in aqueous solution

Construction of Ag‐Bridged Z‐Scheme LaFe0.5Co0.5O3/Ag10/Graphitic Carbon Nitride Heterojunctions for Photo‐Fenton Degradation of Tetracycline Hydrochloride: Interfacial Electron Effect and Reaction Mechanism

Efficient Removal of Cd (II) from Aquatic Media by Heteronanostructure MgO@TiO2@g‐C3N4

Contact Info

Product

Resources

About

Construction of Ag‐Bridged Z‐Scheme LaFe_0.5Co_0.5O₃/Ag₁₀/Graphitic Carbon Nitride Heterojunctions for Photo‐Fenton Degradation of Tetracycline Hydrochloride: Interfacial Electron Effect and Reaction Mechanism

Efficient Removal of Cd (II) from Aquatic Media by Heteronanostructure MgO@TiO₂@g‐C₃N₄