Degradation of methylene blue using a novel magnetic CuNiFe2O4/g-C3N4 nanocomposite as heterojunction photocatalyst

Waheed, Ibrahim F.; Hamad, Muwafaq A.; Jasim, Khalaf A.; Gesquiere, Andre J.

doi:10.1016/j.diamond.2023.109716

Cited by 24 publications

(9 citation statements)

References 85 publications

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“…51 In addition, the other nanomaterials such as CuNiFe 2 O 4 /g-C 3 N 4 nanocomposite and bismuth nanoparticle had the MB degradation with the half-life time of more than 60 min. 52,53 This is also evident by comparing the photocatalytic activity on carbon-coated V 2 O 3 / CNT/TiO 2 heated at 973 K (MB half-life time = 70 min under 8 W visible-light irradiation) 54 and the photocatalytic activity on TiO 2 in CNTs heated at 573−773 K (MB half-life time = 75 min under 15 W visible-light irradiation). 55 Both the studies used 0.05 g of nanocatalyst, which is three times higher in amount than in this work.…”

Section: Resultsmentioning

confidence: 85%

Superior Thermal Stability and High Photocatalytic Activity of Titanium Dioxide Nanocatalysts in Carbon Nanotubes

Watanabe,

Takawane,

Baba

et al. 2023

J. Phys. Chem. C

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TiO2 anatase, which exhibits the highest catalytic performance, transforms to rutile at 800 K. To inhibit the transition of anatase to rutile, several strategies, such as metal and/or non-metal doping, oxygen enrichment, and surface coating, have been studied, resulting in stable anatase within 773–1273 K. However, highly stable anatase without dopants is still required. Here, a new approach, which involves the synthesis of anatase nanocatalysts in carbon nanotubes (CNTs), was proposed to inhibit the anatase-to-rutile transition. The nanocatalysts exhibited high thermal anatase stability along with a suppression of the crystal growth up to 1200 K. The highly stable anatase in CNTs also exhibited high photocatalytic activity, which was evaluated based on methylene blue decomposition under visible- and UV-light irradiation. This was attributed to the maintenance of the small crystal size of the nanocatalysts in addition to a synergetic effect between the TiO2 nanocatalysts and CNTs.

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Section: Resultsmentioning

confidence: 85%

Superior Thermal Stability and High Photocatalytic Activity of Titanium Dioxide Nanocatalysts in Carbon Nanotubes

Watanabe,

Takawane,

Baba

et al. 2023

J. Phys. Chem. C

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“…The role of pH in the photodegradation of organic pollutants, particularly in the removal of MB, is widely recognized as it significantly affects the production of hydroxyl radicals. To investigate this, the photodegradation of MB was carried out under visible light irradiation using CuWO4/g-C3N4 as a catalyst over a range of pH values (3)(4)(5)(6)(7)(8)(9). The impact of pH on the photodegradation of MB is presented in Figure 9.…”

Section: Photodegradation Of Mbmentioning

confidence: 99%

“…Visible light-driven semiconductors are particularly valuable due to their ability to utilize sunlight from the solar spectrum, facilitated by their low energy band gaps. Among them, g-C3N4, a polymeric semiconductor, has attracted increasing interest since the discovery of its ability to produce hydrogen through photocatalysis in 2009 [7][8][9]. Although g-C3N4 has a moderate energy band gap (∼ 2.7 eV) that allows it to absorb visible light effectively, its valence band potential (VBP) exhibits limited oxidation ability, leading to the fast recombination of electrons and holes, which hinders its practical applications.…”

Section: Introduction *mentioning

confidence: 99%

“…Although g-C3N4 has a moderate energy band gap (∼ 2.7 eV) that allows it to absorb visible light effectively, its valence band potential (VBP) exhibits limited oxidation ability, leading to the fast recombination of electrons and holes, which hinders its practical applications. Therefore, there is a strong motivation to develop suitable modifications to enhance the photocatalytic efficiency of g-C3N4 [7][8][9].…”

Section: Introduction *mentioning

confidence: 99%

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A Novel Heterojunction CuWO4/g-C3N4 Photocatalyst for Removal of Organic Pollutant under Visible Light Irradiation

Dang

Nguyen

2023

NST

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In this study, a series of CuWO4/g-C3N4 composites were synthesized using a facile construction method. The structural characteristics of the composites were examined using various techniques, including XRD, SEM, SEM-EDS, FT-IR, and UV–DRS. The photocatalytic performance of the CuWO4/g-C3N4 nanocomposites was evaluated in the degradation of methylene blue (MB) under visible light irradiation. The findings revealed that the CuWO4/g-C3N4 composite with a mass ratio of 10% CuWO4 displayed the highest efficiency (89%) in degrading MB during an 80-minute photodegradation process, which was consistent with the pseudo-first-order kinetics. These results clearly demonstrate that the formation of a Z-scheme CuWO4/g-C3N4 heterojunction significantly improves the photocatalytic efficiency by promoting rapid separation of electron-hole pairs and enhancing the redox capability. Additionally, the photodegradation efficiency remained above 85% even after four cycles, suggesting the stability of the catalyst.

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“…However, one major challenge encountered with most photocatalysts in powder form is their non-magnetic nature, making them difficult to separate from the purified solution. To address this issue, coupling [ 16 , 17 , 18 , 19 ] magnetic particles with non-magnetic semiconductor photocatalysts appears to be the most logical solution. By incorporating magnetic particles into the hybrid photocatalysts, an external magnetic field can be used to easily separate them after the photocatalytic process, ensuring reusability and offering a promising approach for environmental pollution control.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Carbon Quantum Dots/Iron Oxide Composite Based on Waste Rice Noodle and Iron Oxide Scale: Preparation and Photocatalytic Capability

Ying,

Liu,

Jin

et al. 2023

Nanomaterials

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To provide an economical magnetic photocatalyst and introduce an innovative approach for efficiently utilizing discarded waste rice noodle (WRN) and iron oxide scale (IOS), we initially converted WRN into carbon quantum dots (CQDs) using a hydrothermal method, simultaneously calcining IOS to obtain iron oxide (FeOx). Subsequently, we successfully synthesized a cost-effective, magnetic CQDs/FeOx photocatalytic composite for the first time by combining the resulting CQDs and FeOx. Our findings demonstrated that calcining IOS in an air atmosphere enhanced the content of photocatalytically active α-Fe2O3, while incorporating WRN-based CQDs into FeOx improved the electron-hole pair separation, resulting in increased O2 reduction and H2O oxidation. Under optimized conditions (IOS calcination temperature: 300 °C; carbon loading: 11 wt%), the CQDs/FeOx composite, utilizing WRN and IOS as its foundation, exhibited exceptional and reusable capabilities in photodegrading methylene blue and tetracycline. Remarkably, for methylene blue, it achieved an impressive degradation rate of 99.30% within 480 min, accompanied by a high degradation rate constant of 5.26 × 10−3 min−1. This composite demonstrated reusability potential for up to ten photocatalytic cycles without a significant reduction in the degradation efficiency, surpassing the performance of IOS and FeOx without CQDs. Notably, the composite exhibited strong magnetism with a saturation magnetization strength of 34.7 emu/g, which enables efficient and convenient recovery in photocatalytic applications. This characteristic is highly advantageous for the large-scale industrial utilization of photocatalytic water purification.

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Degradation of methylene blue using a novel magnetic CuNiFe2O4/g-C3N4 nanocomposite as heterojunction photocatalyst

Cited by 24 publications

References 85 publications

Superior Thermal Stability and High Photocatalytic Activity of Titanium Dioxide Nanocatalysts in Carbon Nanotubes

Superior Thermal Stability and High Photocatalytic Activity of Titanium Dioxide Nanocatalysts in Carbon Nanotubes

A Novel Heterojunction CuWO4/g-C3N4 Photocatalyst for Removal of Organic Pollutant under Visible Light Irradiation

Magnetic Carbon Quantum Dots/Iron Oxide Composite Based on Waste Rice Noodle and Iron Oxide Scale: Preparation and Photocatalytic Capability

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