Data for: Utilization of carbonized and non-carbonized eucalyptus leaves (dogonyaro) as an ecofriendly adsorbent for indoor air and water purification in sustainable building systems

The increasing demand for sustainable and cost-effective materials for air and water purification has led to growing interest in bio-based adsorbents derived from plant biomass. This study investigated the adsorption performance of carbonized (biochar, BC-600) and non-carbonized (raw leaf, NC-EL) Eucalyptus (Dogonyaro) leavc es, alongside chemically activated carbon (AC-KOH-700), as eco-friendly adsorbents for use in sustainable building systems. The adsorbents were prepared via controlled carbonization and KOH activation, then tested for their capacity to remove model pollutants from aqueous and indoor air systems under batch conditions. Results revealed that the activated carbonized Eucalyptus (AC-KOH-700) exhibited the highest adsorption capacity ((q_e = 190 , \text{mg/g})) and removal efficiency (95%), compared to BC-600 (160 mg/g, 80%) and NC-EL (180 mg/g, 90%). Adsorption kinetics conformed to the pseudo-second-order model, indicating chemisorption as the rate-limiting step, while equilibrium data fitted both the Langmuir and Freundlich isotherm models with high correlation coefficients ((R^2 > 0.95)). These findings confirm that Eucalyptus leaves, a widely available agro-waste, can be effectively converted into high-performance adsorbents for environmental remediation applications. The study underscores the potential of integrating bio-based adsorbents into building materials and air purification systems as a sustainable strategy to achieve cleaner indoor environments and support the global circular economy.