An overview of improving photocatalytic activity of MnO2 via the Z-scheme approach for environmental and energy applications

Malhotra, Monika; Poonia, Komal; Singh, Pardeep; Khan, Aftab Aslam Parwaz; Thakur, Pankaj; Le, Quyet Van; Helmy, Elsayed T.; Ahamad, Tansir; Nguyen, Van‐Huy; Thakur, Sourbh; Raizada, Pankaj

doi:10.1016/j.jtice.2023.104945

Cited by 51 publications

(3 citation statements)

References 87 publications

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“…The regeneration of the nanohybrid material has been thoroughly assessed through repeated use in the degradation of dyes. , In the process of evaluating its regeneration, the used nanohybrid material was first repeatedly washed with DI water and then subjected to a heat treatment at 300 °C for 30 min. Subsequently, the regenerated nanohybrid underwent further utilization for its photocatalytic activity (Figure d).…”

Section: Resultsmentioning

confidence: 99%

Persea Americana Leaf Extract-Derived Nanohybrids: A Sustainable and Green Approach for Rapid Photocatalytic Degradation of Organic Contaminants in Water

Singh,

Avasarala,

et al. 2024

ACS Sustainable Resour. Manage.

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This study introduces a straightforward, sustainable, and eco-friendly approach to fabricating nanohybrids of TiO 2 integrated with carbon nanotubes (CNTs) derived from Persea americana leaves at ambient temperature, thus obviating the requirement for harmful chemicals. The Persea americana leaf extracts serve as both reducing and capping agents, and the reaction at room temperature enables precise control over the nucleation and growth of anisotropic TiO 2 particles within the nanohybrid structure. Surface morphology analysis reveals a mitochondria-like morphology with distorted spherical tips for the TiO 2 particles, while the CNTs act as connecting bridges. TEM analysis confirms that the CNTs are multiwalled, and TiO 2 exhibits a crystallite size of around 12.1 nm. X-ray diffraction analysis revealed that the synthesized TiO 2 exhibits the anatase phase. Assessment of the photocatalytic performance using methylene blue (MB) as a model contaminant demonstrates remarkable results, with the nanohybrid achieving 99.80% degradation of the dye and over 98.3% degradation within an hour under both UV and visible light, respectively. Furthermore, the TiO 2 /CNT nanohybrid exhibits excellent recyclability even after numerous cycles, consistently achieving dye removal exceeding 99.99%. Overall, the TiO 2 / CNT nanohybrid demonstrates the rapid and efficient removal of hazardous dyes from industrial water waste while maintaining its degradation efficiency over multiple uses. Additionally, its sustainable and straightforward synthesis methods make it a promising advanced material for water remediation applications.

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Section: Resultsmentioning

confidence: 99%

Persea Americana Leaf Extract-Derived Nanohybrids: A Sustainable and Green Approach for Rapid Photocatalytic Degradation of Organic Contaminants in Water

Singh,

Avasarala,

et al. 2024

ACS Sustainable Resour. Manage.

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“…On the other hand, manipulation of anion vacancy density and distribution of physical features like band-gap, conductivity, magnetism, etc. can be controlled and enhanced. − The role of AVs as specific centers for capturing e/h pairs inhibits the e/h recombination. The overlapping of the conduction band (CB) or valence band (VB) (as a band tail state) due to the mid-gap state induced by these defects alters the semiconductor band-gap .…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Review on the Boosted Effects of Anion Vacancies in Photocatalytic Solar Water Splitting: Focus on g-C₃N₄ with Carbon and Nitrogen Vacancies

Rezaei,

Nezamzadeh-Ejhieh,

Massah

2024

Energy Fuels

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As one of the best sustainable approaches for visible-light production of hydrogen (H 2 ) to meet energy demands, semiconductor-based photocatalysis has received broad interest in recent decades. The fundamental restrictions of graphitic carbon nitride (g-C 3 N 4 ) as a promising metal-free photocatalytic semiconductor in water splitting, like insufficient visible-light harvesting and high electron−hole (e/h) pairs recombination, have limited its applications for this goal. In this regard, the optical, charge separation, and surface features of g-C 3 N 4 can be tuned via engineering C/N vacancies, which is reviewed here for water splitting by g-C 3 N 4 . Reports confirm that the enhanced surface features of g-C 3 N 4 resulting from the engineering of C/N vacancies are helpful for water adsorption on its surface, improving the water-splitting kinetics. First in this Review, recent improvements to the structural and optical characteristics of g-C 3 N 4 by introducing C/N vacancies, especially nitrogen vacancies, will be discussed to illustrate its better photocatalytic performance. Then, various strategies for creating and controlling C/N vacancies will be reviewed. The critical roles of C/N vacancies for optimizing photocatalytic performance will also be described, and finally advances in defective photocatalysis water oxidation will be addressed.

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“…14,15 Band gap engineering has emerged as a hotspot center for various research studies, which include the synthesis and immobilization of nanoparticles, fabrication of z-scheme based photocatalysts, etc. [16][17][18] The artificial conjugation of hydrogels and inorganic components has garnered significant attention due to its crucial applications across various fields, such as cancer therapy, drug delivery systems, 19 enzyme immobilization, 20 biomedical applications, and more. 21 Hydrogels provide a hydrophilic matrix within the polymeric structure and can absorb water up to thousands of times their dry weight.…”

Section: Introductionmentioning

confidence: 99%

A nano CoFe₂O₄ entangled CMC/psyllium/RGO (CPR_HG/CF)-based hydrogel composite for the adsorption & photocatalytic removal of pharmaceutical effluent: tramadol

Devi,

Sharma,

Dhiman

et al. 2024

New J. Chem.

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An overview of improving photocatalytic activity of MnO2 via the Z-scheme approach for environmental and energy applications

Cited by 51 publications

References 87 publications

Persea Americana Leaf Extract-Derived Nanohybrids: A Sustainable and Green Approach for Rapid Photocatalytic Degradation of Organic Contaminants in Water

Persea Americana Leaf Extract-Derived Nanohybrids: A Sustainable and Green Approach for Rapid Photocatalytic Degradation of Organic Contaminants in Water

A Comprehensive Review on the Boosted Effects of Anion Vacancies in Photocatalytic Solar Water Splitting: Focus on g-C₃N₄ with Carbon and Nitrogen Vacancies

A nano CoFe₂O₄ entangled CMC/psyllium/RGO (CPR_HG/CF)-based hydrogel composite for the adsorption & photocatalytic removal of pharmaceutical effluent: tramadol

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An overview of improving photocatalytic activity of MnO2 via the Z-scheme approach for environmental and energy applications

Cited by 51 publications

References 87 publications

Persea Americana Leaf Extract-Derived Nanohybrids: A Sustainable and Green Approach for Rapid Photocatalytic Degradation of Organic Contaminants in Water

Persea Americana Leaf Extract-Derived Nanohybrids: A Sustainable and Green Approach for Rapid Photocatalytic Degradation of Organic Contaminants in Water

A Comprehensive Review on the Boosted Effects of Anion Vacancies in Photocatalytic Solar Water Splitting: Focus on g-C3N4 with Carbon and Nitrogen Vacancies

A nano CoFe2O4 entangled CMC/psyllium/RGO (CPRHG/CF)-based hydrogel composite for the adsorption & photocatalytic removal of pharmaceutical effluent: tramadol

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Product

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A Comprehensive Review on the Boosted Effects of Anion Vacancies in Photocatalytic Solar Water Splitting: Focus on g-C₃N₄ with Carbon and Nitrogen Vacancies

A nano CoFe₂O₄ entangled CMC/psyllium/RGO (CPR_HG/CF)-based hydrogel composite for the adsorption & photocatalytic removal of pharmaceutical effluent: tramadol