ItemArticle

Facile synthesis of novel ternary g-C?N?/MnO?/CQDs nanocomposite for efficient photocatalytic degradation of methylene blue and DFT study

Title
Facile synthesis of novel ternary g-C?N?/MnO?/CQDs nanocomposite for efficient photocatalytic degradation of methylene blue and DFT study
Creator
Ashwini, M.A.; Sagadevan, Suresh; Patel, B.G. Maya; Hegde, Gurumurthy; Jyothi, M.S.; Upadhyay, Sumant; Garg, Seema; Anudeep, Yedla Venkata Durga; Mishra, Raghvendra Kumar; Johan, Mohd Rafie
Description
A novel type II staggered heterojunction photocatalyst, g-C?N?/MnO?/CQDs (CCM nanocomposite), has prepared through a facile hydrothermal route using MnO? nanoparticles (NPs) varying between 3 % and 5 %. The 5 % CCM nanocomposite has exhibited superior photocatalytic performance, achieving a maximum degradation efficiency of 98.38 % for methylene blue (MB) under UV light irradiation within 120 min. This performance significantly surpassed those of pristine g-C?N? and MnO?. Kinetic analysis has demonstrated a rate constant of 2.96 10? min? and a half-life of 23.42 min under optimal conditions. The degradation efficiency gets increased from 93.15 % to 98.38 % with the increase in pH from 3 to 7, whereas higher dye concentrations (10 and 20 ppm) has resulted with the decreasing efficiencies of 87.1 % and 73.9 %, respectively. BrunauerEmmettTeller (BET) analysis has confirmed the mesoporous nature of the 5 % CCM nanocomposite, with a specific surface area of 5.27 m g?, an average pore size of 11.52 nm, and a pore volume of 0.03 cm g?. The bandgap energies are determined to be notably reduced to 2.7 eV for 5 % CCM nanocomposite. Thermogravimetric analysis (TGA) has shown the excellent thermal stability of the 5 % CCM nanocomposite up to 750 C. Vibration Sample Magnometer (VSM) analysis has specified the weak ferromagnetic behaviour. Density functional theory (DFT) calculations were performed to evaluate the electronic structure and charge-transfer mechanism underlying the improved performance. Importantly, reusability tests over five consecutive cycles showed that the 5 % CCM nanocomposite has retained 80 % of its initial photocatalytic activity, demonstrating excellent catalyst stability and potential for practical applications. 2025 Elsevier B.V.
Source
Surfaces and Interfaces;Volume;72;Issue;;Article No.;107369;
Date
01-01-2025
Publisher
Elsevier B.V.
Subject
CQD; DFT analysis and photocatalytic application; g-C3N4; MnO2; Nanocomposite
Coverage
Ashwini M.A., Nanotechnology and Catalysis Research Center, Institute for Advanced Studies (IAS), University of Malaya, Kuala Lumpur, 50603, Malaysia; Sagadevan S., Nanotechnology and Catalysis Research Center, Institute for Advanced Studies (IAS), University of Malaya, Kuala Lumpur, 50603, Malaysia; Patel B.G.M., Department of Chemistry, Christ University, Karnataka, Bengaluru, 560029, India, Centre for Advanced Research and Development (CARD), Christ University, Karnataka, Bengaluru, 560029, India; Hegde G., Department of Chemistry, Christ University, Karnataka, Bengaluru, 560029, India, Centre for Advanced Research and Development (CARD), Christ University, Karnataka, Bengaluru, 560029, India; Jyothi M.S., Nitte (Deemed to be University), Nitte Meenakshi Institute of Technology (NMIT), Department of Chemistry, Bengaluru, 560064, India; Upadhyay S., Amity Institute of Nanotechnology, Amity University, Uttar Pradesh, Noida, India; Garg S., Deptartment of Chemistry, Amity Institute of Applied Sciences, Amity University, Sector-125, Uttar Pradesh, Noida, India; Anudeep Y.V.D., Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, 110016, India; Mishra R.K., Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, 110016, India; Johan M.R., Nanotechnology and Catalysis Research Center, Institute for Advanced Studies (IAS), University of Malaya, Kuala Lumpur, 50603, Malaysia
Rights
Restricted Access; Hardcopy may be available in the library
Relation
ISSN: 24680230;
Format
online
Language
English
Type
Article

Citation

Ashwini, M.A.; Sagadevan, Suresh; Patel, B.G. Maya; Hegde, Gurumurthy; Jyothi, M.S.; Upadhyay, Sumant; Garg, Seema; Anudeep, Yedla Venkata Durga; Mishra, Raghvendra Kumar; Johan, Mohd Rafie, “Facile synthesis of novel ternary g-C?N?/MnO?/CQDs nanocomposite for efficient photocatalytic degradation of methylene blue and DFT study,” CHRIST (Deemed To Be University) Institutional Repository, accessed June 18, 2026, https://archives.christuniversity.in/items/show/22464.

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