Construction of hybrid g-C3N4/CdO nanocomposite with improved photodegradation activity of RhB dye under visible light irradiation

Munusamy, Thurga Devi; Yee, Chin Sim; Khan, Maksudur R.

doi:10.1016/j.apt.2020.05.017

Cited by 61 publications

(8 citation statements)

References 45 publications

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“…Under photo-irradiation, the photo-induced e−/h+ pairs on the CB/VB of each semiconductor were created. As reported previously, the principal active species for the photocatalytic degradation of RhB included hydroxyl radicals (•OH) and superoxide radicals (•O 2 − ), which were composed of the creation of h + and e − [34], and some researchers have explored intermediates and key reaction species [45][46][47]. S-doped catalysts displayed a less intense emission than pure NaTaO 3 samples, indicating a reduced e − /h + recombination and an enhanced RhB photodegradation performance [12].…”

Section: Resultsmentioning

confidence: 87%

“…This plausible mechanism comprised excitation of the CB of the Sn3O4; then, the e − on the CB of the NaTaO3 reacted with the available O2 to produce the superoxide radicals •O2 − . Then, the •O2 − degraded RhB, or the RhB intermediate, into degraded products [45]. [31], and holes contributed more to the high photocatalytic performance, while •OH showed less importance in its ability to degrade RhB [34].…”

Section: Resultsmentioning

confidence: 99%

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Efficient Photocatalytic Degradation of RhB by Constructing Sn3O4 Nanoflakes on Sulfur-Doped NaTaO3 Nanocubes

2021

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Band structure engineering and heterojunction photocatalyst construction are efficient approaches to improve the separation of photo-induced electrons and holes, along with enhancing light response ability. By sulfur doping, sodium tantalite (NaTaO3) showed an improved photocatalytic property for the degradation of Rhodamine B (RhB). Sn3O4 nanoflakes were constructed on the surface of NaTaO3 nanocubes, forming a surface heterostructure via a simple hydrothermal process, initially. This heterostructure endows the photocatalyst with an enhanced charge separation rate, resulting in an improved photocatalytic degradation of RhB. Moreover, a possible mechanism over Sn3O4/NaTaO3 and the photodegradation pathway of RhB were proposed as the combined effect of photo-induced electrons and holes. This facile process for band structure engineering and heterostructure construction provides the possibility for the practical application of high-efficiency photocatalysts.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Efficient Photocatalytic Degradation of RhB by Constructing Sn3O4 Nanoflakes on Sulfur-Doped NaTaO3 Nanocubes

2021

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“…The indirect detection of active species for the photodegradation mechanism by the use of scavengers has been confirmed in many reports. 48,49 Similar to those in previous literatures, 50,51 isopropyl alcohol (IPA), benzoquinone (BQ), and triethanolamine (TEOA) as the scavengers were added to the system to verify the presence of ˙OH, ˙O 2 − and h + , respectively. Fig.…”

Section: Resultsmentioning

confidence: 99%

A facile synthesis of highly efficient In₂S₃ photocatalysts for the removal of cationic dyes with size-dependent photocatalysis

et al. 2023

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“…According to the Mott–Schottky curve (Figure 5c), the conduction bands of CN and MoS 2 are estimated to be −1.06 and −0.19 eV (AgCl potential is about 0.2 eV), respectively. [ 32 ] The Mott–Schottky equation is as follows (Equation 1) [ 40 ]

\begin{array}{*{20}{c}}{\frac{1}{{{C^2}}} = \frac{2}{{\varepsilon {\varepsilon _0}{{\rm{A}}^2}e{N_{\rm{D}}}}}\left( {V - {V_{fb}} - \frac{{{K_{\rm{B}}}T}}{e}} \right)}\end{array}

The bandgap of MoS 2 is about 2.1 eV, so the valence bands of CN and MoS 2 can be calculated to be 1.72 and 1.91 eV, respectively. [ 41 ]…”

Section: Resultsmentioning

confidence: 99%

Efficient Charge Transfer in Z‐Scheme g‐C₃N₄/Cu/MoS₂ Heterojunctions for Enhanced Photocatalysis and Photoenhanced Electrocatalysis

Zhu

Wang

Luan

et al. 2022

Adv Materials Inter

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properties make its structure diverse and shapeable. [6] However, the application of bulk CN in photocatalysis is still limited due to its low conductivity, high recombination rate of carriers and holes and small specific surface area. [7,8] Various modification methods such as element doping, morphology control, and heterogeneous structure design have been tried to enhance the charge transfer kinetics and inhibit the recombination of carriers, so as to improve the optical and electrochemical capabilities. [9,10] Doping metal elements (such as Au, Pt, Cu) in CN is a simple and effective modification strategy, which can greatly improve the conductivity of CN and promote charge transfer. [11][12][13][14] Li et al. doped Pt ions into CN, changing the charge transport path and making CN have infrared absorption. [15] It is worth mentioning that due to the surface plasmon resonance effect of Au, Pt, Cu, and other metals, it can be used as an electronic conductor to participate in the construction of Z-scheme heterojunction. [16][17][18] In the application of photocatalytic hydrogen production, CN must rely on precious metals such as Pt as cocatalyst to play a role, but this requires high cost. It was found that transition metal dichalcogenides such as MoS 2 , CoP, and Ni 2 P were considered as cheap substitutes for noble metal catalysts because Gibbs free energy was close to Pt. [19][20][21] Moreover, when it forms a heterojunction with CN, the charge transfer rate is able to accelerate through the coupling force between the interfaces, so as to avoid its recombination with holes. Such as Luo et al. prepared CoP/CN composite, CoP as cocatalyst, the hydrogen production rate under visible light irradiation reached 1.074 mmol h −1 g −1 . [22] In this paper, CN/Cu/MoS 2 (CN-CU-MS) Z-scheme heterojunctions were successfully constructed. As an electronic conductor, Cu changed the original II-type transmission path between CN and MoS 2 into Z-scheme transfer, which greatly increased the charge transfer rate and more effectively inhibits the recombination of charges. The existence and interaction of Cu and MoS 2 were verified by morphology and structure characterization. Through the photocatalytic hydrogen production test of the samples, it was found that the hydrogen production rate of CN-CU-MS was 2.63 times that of CN/MoS 2 (CN-MS), which was also much higher than that of CN/MoS 2 /Cu(CN-MS-Cu).Efficient charge separation and transfer is always an important prerequisite for efficient photocatalysis. Herein, g-C 3 N 4 /Cu/MoS 2 Z-scheme heterojunctions are successfully constructed by a two-step calcination method, in which Cu nanoparticles are embedded as an electronic conductor between g-C 3 N 4 and MoS 2 . g-C 3 N 4 /Cu/MoS 2 composites reveal excellent photocatalytic activity. The rate of hydrogen production reaches to 970.5 µmol g −1 h −1 , which is 22 and 2.63 times of that of g-C 3 N 4 and g-C 3 N 4 /MoS 2 , respectively. Meanwhile, due to the significant enhancement of the conductivity of g-C 3 N 4 /Cu/MoS 2 and the ...

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Construction of hybrid g-C3N4/CdO nanocomposite with improved photodegradation activity of RhB dye under visible light irradiation

Cited by 61 publications

References 45 publications

Efficient Photocatalytic Degradation of RhB by Constructing Sn3O4 Nanoflakes on Sulfur-Doped NaTaO3 Nanocubes

Efficient Photocatalytic Degradation of RhB by Constructing Sn3O4 Nanoflakes on Sulfur-Doped NaTaO3 Nanocubes

A facile synthesis of highly efficient In₂S₃ photocatalysts for the removal of cationic dyes with size-dependent photocatalysis

Efficient Charge Transfer in Z‐Scheme g‐C₃N₄/Cu/MoS₂ Heterojunctions for Enhanced Photocatalysis and Photoenhanced Electrocatalysis

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Construction of hybrid g-C3N4/CdO nanocomposite with improved photodegradation activity of RhB dye under visible light irradiation

Cited by 61 publications

References 45 publications

Efficient Photocatalytic Degradation of RhB by Constructing Sn3O4 Nanoflakes on Sulfur-Doped NaTaO3 Nanocubes

Efficient Photocatalytic Degradation of RhB by Constructing Sn3O4 Nanoflakes on Sulfur-Doped NaTaO3 Nanocubes

A facile synthesis of highly efficient In2S3 photocatalysts for the removal of cationic dyes with size-dependent photocatalysis

Efficient Charge Transfer in Z‐Scheme g‐C3N4/Cu/MoS2 Heterojunctions for Enhanced Photocatalysis and Photoenhanced Electrocatalysis

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A facile synthesis of highly efficient In₂S₃ photocatalysts for the removal of cationic dyes with size-dependent photocatalysis

Efficient Charge Transfer in Z‐Scheme g‐C₃N₄/Cu/MoS₂ Heterojunctions for Enhanced Photocatalysis and Photoenhanced Electrocatalysis