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707 results on '"Madhavan, J."'

3. Synergistic design of CuO/CoFe₂O₄/MWCNTs ternary nanocomposite for enhanced photocatalytic degradation of tetracycline under visible light

Author

Davis Varghese, Niranjana S. R, Joselene Suzan Jennifer P, Muthupandi S, Madhavan J, and Victor Antony Raj M

Subjects
Photocatalysis, CuO/CoFe2O4/MWCNTs, Visible light, Tetracycline, Degradation kinetics, Medicine, Science
Abstract

Abstract This study involves a novel CuO/CoFe₂O₄/MWCNTs (CCT) nanocomposite, developed by integrating cobalt ferrite (CoFe₂O₄) and copper oxide (CuO) nanoparticles onto multi-walled carbon nanotubes (MWCNTs), for the degradation of tetracycline (TC) under visible light. The photocatalyst was extensively characterized using XRD, HR-SEM, EDX, HR-TEM, UV-Vis, BET, and PL analysis. The synthesized CoFe₂O₄ and CuO nanoparticles exhibited crystallite sizes of 46.8 nm and 37.5 nm, respectively, while the CCT nanocomposite had a crystallite size of 53 nm. Microscopy confirmed a particle size of 49.2 nm for the nanocomposite, with MWCNTs measuring 15.65 nm in diameter. The band gap energy of the CCT nanocomposite was 1.6 eV, which contributed to its enhanced photocatalytic activity, as evidenced by the lower emission intensity in PL analysis. BET analysis revealed a pore volume of 0.37 cc/g and a surface area of 82.3 m²/g. Photocatalytic performance was tested across various conditions, with adjustments to nanocomposite dosages (0.1–0.5 g/L), TC concentrations (5–25 mg/L), and pH levels (2–10). Under optimized conditions (0.3 g/L CCT, 5 mg/L TC, pH 10, 120 min of visible light exposure), the CCT achieved 98.1% degradation of TC. The optimized parameters were subsequently used to assess TC degradation with individual photocatalysts: CoFe₂O₄, CuO, CT, and CCT. The enhanced photocatalytic efficiency observed can be largely attributed to the improved charge transfer dynamics and effective electron-hole separation facilitated by MWCNT doping. The reaction followed a pseudo-first-order kinetic model, with hydroxyl radicals (OH•) identified as the key species in the degradation process. Moreover, the catalyst exhibited 96% retention of its photocatalytic efficiency after five consecutive cycles, demonstrating exceptional stability and reusability. These results emphasize the CCT composite’s potential as a highly efficient and sustainable photocatalyst for the remediation of pharmaceutical pollutants in aquatic systems.

Published
2025
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5. Fabrication of a non-enzymatic photoelectrochemical sensor based on a BiOBr-CuO nanocomposite for detecting Glucose and Tetracycline

Author

AnnieCanisius D, Joselene Suzan Jennifer P, Joe Raja Ruban M, Davis Varghese, Gladys Joysi M, Muthupandi S, Madhavan J, Victor Antony Raj M, and Saravanan Muthupandian

Subjects
Photoelectrochemical, Nanocomposites, p-p heterojunction, Glucose sensor, Tetracycline, Electrical engineering. Electronics. Nuclear engineering, TK1-9971
Abstract

In this study, we developed a non-enzymatic photoelectrochemical sensor using a BiOBr-CuO (BiCu) electrode, which was synthesized via solvothermal method. The sensor was designed for the simultaneous detection of glucose and tetracycline. Our study revealed that the BiCu electrode exhibited superior photocurrent generation compared to the individual BiOBr and CuO electrodes, as demonstrated by cyclic voltammetry and amperometric studies. The BiCu electrode's performance has increased due to the formation of a heterojunction between CuO and BiOBr, which modifies the UV–visible DRS spectrum and generates an internal electric field that reduces the recombination of the photogenerated carriers. This enhanced the capability of the sensor to detect both glucose and tetracycline. We successfully applied the proposed photoelectrochemical sensor to detect human blood glucose level. The sensitivity and detection limit for glucose and tetracycline are 0.1342 mAmM−1cm−2, 0.014 mM and 1.7234 mAmM−1cm−2, 2.0 μM respectively. Thus, the fabricated electrode demonstrated exceptional catalytic activity, high selectivity, good reproducibility, wide linear detection range, low limit of detection,long-term stability, ease of synthesis, good stability and notable selectivity for detecting both glucose and tetracycline This suggests that the BiCu electrode has significant potential as a reliable platform for the detection of glucose and tetracycline.

Published
2025
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15. Synthetic pathway of 2-fluoro-N,N-diphenylbenzamide with opto-electrical properties: NMR, FT-IR, UV-Vis spectroscopic, and DFT computational studies of the first-order nonlinear optical organic single crystal

Author

Raveendiran C., Prabukanthan P., Madhavan J., Vivekanand P. A., Arumugam Natarajan, Almansour Abdulrahman I., Kumar Raju Suresh, Alaqeel Shatha Ibrahim, and Perumal Karthikeyan

Subjects
x-ray diffraction, optical spectrum, dft, benzamide, crystal growth, Chemistry, QD1-999
Published
2022
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