Akademik Veri Yönetim Sistemi
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY, cilt.22, sa.16, ss.16733-16746, 2025 (SCI-Expanded, Scopus)
Phosphogypsum (PG) is one of the bulk industrial solid wastes generated on annual basis, having a heterogeneous chemical structure including phosphate residues, heavy metals and radionuclides. Balance between PG generation and reuse-recycle rate has still not been established, and untreated PG is generally stockpiled near coastal areas. However, potential environmental risks that might be encountered due to heavy metal release to underground water near coastal regions have been underestimated. This study provides a comparative study on the adsorptive treatment of PG leachate by different carbonaceous materials and aims to evaluate the effectiveness of these adsorbents in treating PG leachate. nGO, MWCNT-COOH and MWCNT-COOH-Fe3O4 were used as adsorbents and adsorption studies were performed according to temperature and PG/adsorbent ratio parameters to observe the performance of adsorbents. Untreated PG was characterized by XRF, FTIR, XRD and TEM analyses. Characterization of adsorbents were performed by UV-Vis spectroscopy, zeta potential, FTIR, XRD and TEM analyses. Leachate composition was determined by ICP-OES analysis to calculate removal of heavy metals and adsorption rate on adsorbents. Main effects plots indicated that Cd, Co, Mn and Zn adsorption was predominantly affected by temperature whereas Pb, Ni Cu and Cr adsorption were controlled by adsorbent type. PG/adsorbent ratio was co-effective with temperature in the case of Fe adsorption. Results of this study might provide an insight into selective adsorption treatment for PG leachate to control the release of a predetermined heavy metal from PG stack to underground water.