In situ synthesis of Cu+ self-doped CuWO4/g-C3N4 heterogeneous Fenton-like catalysts: The key role of Cu+ in enhancing catalytic performance

Huang, Ruoyi; Gu, Xing Yong; Sun, Wuzhu; Chen, Long; Du, Qingyang; Guo, Xue; Li, Jiao; Zhang, Mingwei; Li, Chengfeng

doi:10.1016/j.seppur.2020.117174

Cited by 44 publications

(6 citation statements)

References 51 publications

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“…[41][42][43] We note that the chemical states of W 5 + (34.4 and 36.2 eV) and Cu + (952.6 and 932.7 eV) were detected in CuWO 4 -AT films suggesting the possible presence of little impurity phase under the detection of XRD. [44][45][46] The optical absorption of CuWO 4 -AT and CuWO 4 -AM films was studied by UV-vis diffuse reflectance spectroscopy (DRS). As shown in Figure 4a good photostability.…”

Section: Resultsmentioning

confidence: 99%

Ultrasonic Spray Pyrolysis‐assisted Fabrication of Ultrathin CuWO₄ Films with Improved Photoelectrochemical Performance

Duan

Nahrawy

et al. 2021

ChemNanoMat

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CuWO 4 is a promising n-type oxide semiconductor for photoelectrochemical (PEC) applications due to the suitable band gap and good photochemical stability. An easy and large-scale fabrication of ultrathin CuWO 4 films with improved PEC performance is highly desired for future practical application but still challenging. Considering that the ultrasonic spray pyrolysis approach is a low-cost and scalable technique for fabricating films with controllable thickness, we here report the controllable fabrication of ultrathin CuWO 4 films with improved PEC performance by an automatic ultrasonic spray pyrolysis method. The effects of different tungsten sources and film thickness on the PEC performance of the resultant CuWO 4 film were studied in detail. We find that the ultrathin CuWO 4 film prepared from the ammonium metatungstate with a thickness of 2.16 μm shows the best PEC performance of 41 μA cm À 2 at 1.23 V vs.RHE for water oxidation under visible light irradiation. We also explored the different charge transfer mechanism and PEC performance of the resultant CuWO 4 films under back and front illumination.

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Section: Resultsmentioning

confidence: 99%

Ultrasonic Spray Pyrolysis‐assisted Fabrication of Ultrathin CuWO₄ Films with Improved Photoelectrochemical Performance

Duan

Nahrawy

et al. 2021

ChemNanoMat

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“…[19,[27][28][29] The high resolution of the N 1s spectrum (Figure 1f) is divided into three peaks centered at 398.6, 399.3, and 401.1 eV, which can be attributed to the sp 2 hybridized nitrogen (CNC) in s-triazine rings, bridging N atoms in tertiary nitrogen N(C) 3 , and terminal amino functions (CNH), respectively. [26] No pronounced binding energy shift of C 1s or N 1s is found in Cu-CN-ef, suggesting that the chemical states of both C and N in CuCN are maintained after effervescent treatment. The Cu 2p XPS spectra (Figure 1g) is related to Cu + (933.2 and 952.9 eV), Cu 2+ (935.4 and 955.4 eV), and satellites (943.6 and 963.6 eV).…”

Section: Characterization Of Cu-cn-ef Photo-fenton Catalyst Before An...mentioning

confidence: 98%

“…[25] Besides, a typical g-CN functional group feature of the Cu-CN-ef can also be found in the FT-IR (Figure S3b, Supporting Information). [19,20,26] We successfully designed a g-CN host photocatalyst with ideal highly dispersed Cu species, emerging great prospect for highperformance heterogeneous Fenton reactions. Furthermore, the chemical bonding and valence state of the Cu-CN and Cu-CN-ef were investigated by XPS.…”

Section: Characterization Of Cu-cn-ef Photo-fenton Catalyst Before An...mentioning

confidence: 99%

“…The g-CN shows a strong PL emission peak at 465 nm, which is consistent with previous studies. [26,49,50] The apparent PL quenching is a direct result of strong electron-hole recombination. Due to the Cu doping and effervescent treatment, the fluorescence intensity of Cu-CN-ef is significantly lower than that of g-CN, indicating a superior separation and migration efficiency of photogenerated charges.…”

Section: Photo-fenton Performances and Photoelectrochemical Propertie...mentioning

confidence: 99%

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A Rapid Effervescent Route to Rational Activation of Cu/g‐C₃N₄ and bulk MoS₂ Cocatalyst for Highly Efficient and Robust Photo‐Fenton Process

Ding

Kang

et al. 2022

Adv Materials Inter

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hazardous substances. Among the popular AOPs, the homogeneous and heterogeneous Fenton reactions are most promising with their preponderance in the vast application range, strong anti-interference ability, simple operation, and rapid degradation speeds. [1,2] However, three main limitations still challenge the practical application of the classic homogeneous Fenton process using iron or copper ions, including the slow-cycling efficiency of Fe 3+ /Fe 2+ or Cu 2+ /Cu + , accumulation of iron/copper-containing sludge, and strict requirement of low pH (3.0-4.0). [3,4] Researchers have gradually turned to heterogeneous Fenton-like catalysis to avoid the generation of ferric hydroxide sludge and circumvent the limitation of the acidic pH range on homogeneous Fenton reactions. [5] To address the aforementioned issues, strenuous efforts have been devoted to designing Fe or Cu species in solid catalysts. They are usually given priority in superior heterogeneous Fenton catalysts because of the low cost, negligible toxicity, high catalytic activity, and ease of recovery. [6] Therefore, combining Fenton-like systems with photocatalysts has attracted intensive research interest with their rapid development.Graphitic carbon nitride (g-CN)-supported Fe, Cu catalysts are well recognized as good choices for heterogeneous photo-Fenton catalysts. As the host, g-CN serves as a visible-lightactive metal-free polymeric semiconductor with an appropriate band gap (≈2.7 eV) to harvest solar photon energy efficiently. [7] It can also be employed to construct various highly tailorable composite photocatalysts with adjustable compositions, sizes, pore structures, morphology, and electronic structures. [8][9][10] g-CN can be loaded with Fe or Cu atoms and nanoparticles to form high-performance Fe-CN or Cu-CN photo-Fenton systems, which further accelerates the rate-limiting Fe 3+ /Fe 2+ or Cu 2+ /Cu + reduction process and circulation of high-valence metal ions in the presence of light, thus avoiding the generation of hazardous iron or copper sludge.Up to now, the efficiency of photo-Fenton systems is still unsatisfactory for industrial applications. To further improve the efficiency of heterogeneous Fenton-like reactions, much effort has been carried out to optimize AOPs, including the strategy of adding co-catalysts to boost •OH or singlet oxygen Heterogeneous Fenton-like process with a wide pH range is a promising alternative to traditional homogeneous Fenton reactions. Recently, the boosting effect of MoS 2 cocatalysts is widely recognized in Fenton reactions, and the primary mechanism is the promotion of the reduction and recycling of high-valence metal ions. Unfortunately, integrating heterogeneous Fenton-like catalysts and MoS 2 cocatalyst to form an efficient system remains challenging due to the severe deactivation of MoS 2 and the inability of simple physical mixing to speed up the reaction. For the first time, the direct activation of commercially available bulk MoS 2 powder in a durable acidic micro environment is achieved. The fo...

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“…Some promising properties of tungsten-based materials such as electrical, optical, magnetic, and photocatalytic activities, low-cost preparation persuade researchers to use these materials such as NiWO 4 , BaWO 4 , CuWO 4 , and BiWO 6 [270,[276][277][278]. The band structures of these compounds with g-C 3 N 4 and WO 3 make the CB and VB positions match each other, leading to the prolonged charge carriers' lifetime in the form of a double Z-scheme system.…”

Section: Cheng Et Al Also Demonstrated the Insignificant Deactivation...mentioning

confidence: 99%

A Comprehensive Review of Graphitic Carbon Nitride (g-C3N4)–Metal Oxide-Based Nanocomposites: Potential for Photocatalysis and Sensing

2022

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g-C3N4 has drawn lots of attention due to its photocatalytic activity, low-cost and facile synthesis, and interesting layered structure. However, to improve some of the properties of g-C3N4, such as photochemical stability, electrical band structure, and to decrease charge recombination rate, and towards effective light-harvesting, g-C3N4–metal oxide-based heterojunctions have been introduced. In this review, we initially discussed the preparation, modification, and physical properties of the g-C3N4 and then, we discussed the combination of g-C3N4 with various metal oxides such as TiO2, ZnO, FeO, Fe2O3, Fe3O4, WO3, SnO, SnO2, etc. We summarized some of their characteristic properties of these heterojunctions, their optical features, photocatalytic performance, and electrical band edge positions. This review covers recent advances, including applications in water splitting, CO2 reduction, and photodegradation of organic pollutants, sensors, bacterial disinfection, and supercapacitors. We show that metal oxides can improve the efficiency of the bare g-C3N4 to make the composites suitable for a wide range of applications. Finally, this review provides some perspectives, limitations, and challenges in investigation of g-C3N4–metal-oxide-based heterojunctions.

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In situ synthesis of Cu+ self-doped CuWO4/g-C3N4 heterogeneous Fenton-like catalysts: The key role of Cu+ in enhancing catalytic performance

Cited by 44 publications

References 51 publications

Ultrasonic Spray Pyrolysis‐assisted Fabrication of Ultrathin CuWO₄ Films with Improved Photoelectrochemical Performance

Ultrasonic Spray Pyrolysis‐assisted Fabrication of Ultrathin CuWO₄ Films with Improved Photoelectrochemical Performance

A Rapid Effervescent Route to Rational Activation of Cu/g‐C₃N₄ and bulk MoS₂ Cocatalyst for Highly Efficient and Robust Photo‐Fenton Process

A Comprehensive Review of Graphitic Carbon Nitride (g-C3N4)–Metal Oxide-Based Nanocomposites: Potential for Photocatalysis and Sensing

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In situ synthesis of Cu+ self-doped CuWO4/g-C3N4 heterogeneous Fenton-like catalysts: The key role of Cu+ in enhancing catalytic performance

Cited by 44 publications

References 51 publications

Ultrasonic Spray Pyrolysis‐assisted Fabrication of Ultrathin CuWO4 Films with Improved Photoelectrochemical Performance

Ultrasonic Spray Pyrolysis‐assisted Fabrication of Ultrathin CuWO4 Films with Improved Photoelectrochemical Performance

A Rapid Effervescent Route to Rational Activation of Cu/g‐C3N4 and bulk MoS2 Cocatalyst for Highly Efficient and Robust Photo‐Fenton Process

A Comprehensive Review of Graphitic Carbon Nitride (g-C3N4)–Metal Oxide-Based Nanocomposites: Potential for Photocatalysis and Sensing

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Ultrasonic Spray Pyrolysis‐assisted Fabrication of Ultrathin CuWO₄ Films with Improved Photoelectrochemical Performance

Ultrasonic Spray Pyrolysis‐assisted Fabrication of Ultrathin CuWO₄ Films with Improved Photoelectrochemical Performance

A Rapid Effervescent Route to Rational Activation of Cu/g‐C₃N₄ and bulk MoS₂ Cocatalyst for Highly Efficient and Robust Photo‐Fenton Process