Skip to main content
Dryad

Supporting data from: Green-synthesized zeolite Y–supported zero-Valent iron nanocomposite for enhanced adsorptive reduction of hexavalent chromium from aqueous solutions

Raharjo, Yanuardi1; Mahmuda, Nur Fariha1; Adiarto, Tokok1; Darmokoesoemo, Handoko1; Pramono, Heru1; Ismail, Ahmad Fauzi2

Published May 11, 2026 on Dryad. https://doi.org/10.5061/dryad.sbcc2frnt

Data files

May 11, 2026 version files 518.43 KB

Click names to download individual files

Abstract

Hexavalent chromium (Cr(VI)), a major pollutant in tannery wastewater, poses significant environmental and health risks. Zeolite Y possesses a high cation-exchange capacity but low affinity for Cr(VI), which predominantly exists in anionic forms in aqueous solutions. This study aimed to modify Zeolite Y with zero-valent iron nanoparticles (nZVI) to enhance its capacity to adsorb Cr(VI). The Zeolite Y/nZVI composite was synthesized using green tea extract. nZVI effectively reduces Cr(VI) to less toxic Cr(III), which precipitates as Cr(OH)₃. The composite was characterized using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy–energy dispersive X-ray spectroscopy (SEM–EDX), particle size analysis (PSA), and pH point-zero charge analysis. The highest Cr(VI) adsorption capacity was achieved under acidic conditions (pH = 1), elevated temperature (343 K), an initial Cr (VI) concentration of 30 ppm, and a contact time of 45 min. The adsorption data were well fitted to the Langmuir isotherm and pseudo-second-order kinetic models. The thermodynamic analysis indicated that the adsorption process was endothermic and spontaneous at higher temperatures. The modification of Zeolite Y with Zeolite Y/nZVI enhanced the adsorption capacity from 0.9 mg/g to 7.1 mg/g.