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All Journal Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir
Afiq Azfar Pratama
Badan Riset dan Inovasi Nasional

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Ligand Interaction in Thorium Adsorption by Pacitan Bentonite Roza Indra Laksmana; Mohammad Khotib; Zainal Alim Mas'ud; June Mellawati; Afiq Azfar Pratama; Suci Indryati; Dwi Luhur Ibnu Saputra
Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol. 32 No. 1 (2026): Urania : Jurnal Ilmiah Daur Bahan Bakar Nuklir
Publisher : Badan Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/urania.2026.9210

Abstract

Many studies have investigated the use of bentonite as an adsorbent; however, questions remain regarding the effects of sulfate and phosphate on thorium (Th) adsorption. Sulfate may reduce adsorption through the formation of Th-sulfate complexes and competition for adsorption sites between SO2-and UO2+, whereas phosphate is an important component of subsurface systems and plays a key role in controlling Thmobility. This study investigated Thadsorption by natural and acid-activated Pacitan bentonite as adsorbents for radioactive waste treatment. Because of its large surface area and porosity, bentonite has a high adsorption capacity, which can be further enhanced by acid activation. The adsorbents were characterized by FTIR and XRD to evaluate structuralchanges after activation. Batch experiments were conducted to examine the effects of pH, contact time, temperature, and complexing ligands, including sulfate, carbonate, and phosphate, on Thadsorption. The results showed that natural bentonite exhibited high Thadsorption efficiency from the beginning of the experiment, whereas acid-activated bentonite showed a gradual increase in adsorption efficiency over time. Thcomplexation with sulfate decreased adsorption efficiency, while phosphate improved Thstability in activated bentonite. These findings indicate that Pacitan bentonite, in both natural and acid-activated forms, is a promising adsorbent for Th-containing radioactive waste, provided that the adsorption conditions are properly optimized.
Uranium Adsorption Behavior on Pacitan Bentonite Roza Indra Laksmana; Mohammad Khotib; Zainal Alim Mas'ud; June Mellawati; Afiq Azfar Pratama; Suci Indryati; Dwi Luhur Ibnu Saputra
Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir Vol. 31 No. 2 (2025): Urania: Jurnal Ilmiah Daur Bahan Bakar Nuklir
Publisher : Badan Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/urania.2025.9213

Abstract

Uranium adsorption by Pacitan bentonite was investigated to evaluate its capacity for capturing uranium ions under various conditions. Before being used as an adsorbent, Pacitan bentonite was characterized in terms of pore structure, surface area, surface morphology, adsorption capacity, and chemical composition. This study aims to analyze the factors that influencing uranium adsorption on Pacitan bentonite, including contact time, pH, temperature, and the presence of ligands in solution. Both natural and acid-activated Pacitan bentonite were examined to compare their adsorption performance. The results showed that Pacitan bentonite effectively adsorbs uranium, with the highest adsorption occurring under acidic to neutral pH conditions and decreasing at higher pH levels. Acid activation reduced the uranium adsorption capacity due to structural and surface property changes. In addition, the addition of ligands such as NaCl, Na2SO4, and Na2HPO4 influenced uranium adsorption, with Na2SO4 having the most pronounced effect compared to NaCl and Na2HPO4. Overall, the results indicate that Pacitan bentonite has strong potential as a uranium adsorbent material, especially under suitable conditions to maintain ion exchange and surface adsorption. These findings provide important insights for developing adsorbent materials for nuclear waste treatment and remediation of uranium-contaminated environments. 
Co-Authors Dwi Luhur Ibnu Saputra June Mellawati Mohammad Khotib Roza Indra Laksmana Suci Indryati Zainal Alim Mas'ud