Author: Sreenivas Matla, Pulipati King, Meena Vangalapati, Varsha Pichikala

DOI: http://doi.org/10.31788/RJC.2026.1919474

This study introduces the development of an innovative bio-waste-based zinc–aluminium nanocomposite obtainedfrom the stems of Brassica oleracea var. italica (Zn/Al@BOI), utilising a green co-deposition technique for theadsorption-based elimination of Brilliant Blue (BB) from aqueous environments. The synthesised nanocompositewas thoroughly characterised. We did batch studies to see how important operational factors like the time of contact (35 min), nanocomposite dose (0.28 g L -1), pH (5), temperature of process (318 K), and starting dye concentration(20 mg L -1) affected the results. Response Surface Methodology (RSM) employing a Central Composite Design(CCD) was applied to determine the best values for 35.16 minutes of contact time, 0.29 g L -1 of dose, pH4.97, and20 mgL -1 of dye concentration. This led to a maximum removal efficiency of 93.41%. The Freundlich isotherm(R² = 0.9921) most accurately described the adsorption equilibrium, but the Langmuir model said that 370 mg g⁻¹ is themaximum adsorption capacity. Kinetic and thermodynamic analyses indicated pseudo-second-order kinetics, characterised by a spontaneous, endothermic, and chemisorption-dominated adsorption process.

Keywords: Zn/Al@BOI Nanocomposite, Brilliant Blue Dye, Sustainable Co-Precipitation, Kinetics, Thermodynamics.