20.500.12556/DKUM-92854 The application of zeolites for fixation of Cr(VI) ions in sediments The aim of the study was to investigate the fixation of Cr(VI) ions from contaminated sediments using synthetic zeolite 4A and natural zeolite clinoptilolite. Parameters such as pH, contact time, adsorption mass and temperature were investigated. If the ions of the heavy metals were mobile, they would become toxic to the environment. After sediment digestion, the initial and final concentrations of Cr(VI) were measured in sediment samples with or without zeolite. Inductively coupled plasma with optical emission spectroscopy (ICP-OES) and X-ray diffraction (XRD) were used to characterize the material. The adsorption kinetics were investigated using a pseudo-first order model, a pseudo-second order model, and an intra-particle diffusion model. The results showed that the zeolites enhanced the fixation of Cr(VI). Chemisorption was the main mechanism when using acid-modified zeolite. sediment fixation heavy metals sedimenti fiksiranje težke kovine true true false MDPI Angleški jezik Slovenski jezik https://www.mdpi.com/2673-7167/5/2/19 © 2025 by the author Članek v reviji 2025-05-19 15:46:21 2025-05-19 15:46:22 2025-05-20 03:15:22 0000-00-00 00:00:00 2025 0 0 11 str. no. 2 Vol. 5 May 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-03-17 2025-05-06 2025-05-08 546.3/.9 235950851 10.3390/physchem5020019 2673-7167 physchem-05-00019.pdf physchem-05-00019.pdf 1 E7255C6245EEFDA9A5489E5A99BBCF21 73ea716c3bc6855e7f65c6801e570e0a98e8ace96299c0673309fa444fd66f9e fa78544d-34b7-11f0-ad3e-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=191112 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0