Abstract
In this work, the biogenic synthesis route using the leaf extract of Buxus papillosa was employed for the green synthesis of copper oxide (CuO) and nickel oxide (NiO) nanoparticles (NPs), which were then applied for the catalytic degradation of Alizarin Red S dye (ARS) as a model organic pollutant. Scanning electron microscopy (SEM) analysis confirmed spherical and rod-like morphologies for CuO and NiO NPs, respectively, while Energy dispersive spectroscopy (EDS) verified their elemental composition. The average crystallite sizes of CuO and NiO NPs were 6.21 and 5.94 nm, respectively, as determined by X-ray diffraction (XRD), and their optical band gaps were estimated as 3.63 eV and 3.32 eV from UV–Vis analysis. The degradation kinetics followed a pseudo-first-order model with rate constants of 0.037 min−1 (CuO) and 0.031 min−1 (NiO), while Langmuir isotherm fitting (R2 > 0.98) indicated monolayer adsorption. After 75 min, CuO and NiO NPs removed 73.32 ± 1.85 and 71.50 ± 2.07% of ARS dye, respectively, which increased to 96.01 ± 1.16 and 90.83 ± 1.43% with NaBH4 addition. Both catalysts maintained >90% efficiency up to five reuse cycles, demonstrating high stability and reusability. These results confirm the potential of Buxus papillosa -modified CuO and NiO NPs as sustainable and effective nano-catalysts for wastewater treatment.
Document Type
Journal Article
Date of Publication
2-1-2026
Volume
20
Publication Title
Results in Chemistry
Publisher
Elsevier
School
School of Engineering
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Comments
Zahid, A., Hassan, W., Ali, S. A., Ullah, Z., Younas, M., Shah, S. N., Fatehizadeh, A., & Rezakazemi, M. (2025). Novel Buxus papillosa-assisted green synthesis of copper and nickel oxide nanoparticles with enhanced catalytic degradation of alizarin red S dye. Results in Chemistry, 20, 102966. https://doi.org/10.1016/j.rechem.2025.102966