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All Journal Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Basuki, Triyono
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Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Engineering Materials Science & Nanotechnology

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Adsorption of Uranium onto Delaminated Amino Talc-Like Clay Saputra, Dwi Luhur Ibnu; Purwaningsih, Henny; Farid, Muhammad; Basuki, Triyono; Nakashima, Satoru; Rachmadetin, Jaka; Laksmana, Roza Indra; Sihotang, Juan Carlos; Noerpitasari, Erlina
EKSPLORIUM Vol. 46 No. 1 (2025): MAY 2025
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/eksplorium.2025.12136

Abstract

Uranium-containing waste is generated as a by-product of nuclear power plants, radioisotope production, nuclear fuel fabrication, and mineral processing. A radioactive waste treatment plant treats radioactive liquid waste using various methods, including evaporator technology, ion exchange resins, and adsorbents. Various adsorbents have been investigated for the removal of uranium from aqueous solutions. Negatively charged adsorbents, such as natural clay, biomass-based adsorbents, and polymers, have been utilized for uranium adsorption. Previous research on uranium adsorption by amino clay, which has a positively charged surface, was still very limited compared to other adsorbents. In the present study, the application of Delaminated Amino talc-like Clay (DAC) for removing uranium from aqueous solutions was examined. DAC with amino propyl on the tetrahedral sheet surface is easily protonated to form a positively charged R-NH3 that may influence its interaction with uranium. The speciation and reaction kinetic order were studied in aqueous solution with pH and contact time as the variables. The adsorption of uranium onto DAC, which is likely due to physicochemical interactions and ion trapping, was evaluated. The maximum removal efficiency (84.5%) and adsorption capacity (113.06 mg/g) were achieved at pH 4 after approximately 60 minutes. The uranium adsorption capacity is low at pH 2 and 3 (10%), which is due to the repulsive interaction between the positive surface charge of DAC and (UO2)2+ as the dominant uranium species. Uranium adsorption capacity is high at pH 4 and 5, because the predominant species of uranium, such as (UO2)2+ and [(UO2)2(OH)2]2+, were probably adsorbed by DAC through chemisorption with R-NH2. The adsorption of uranium on the DAC was found to follow the pseudo-second order kinetic model.
Preliminary Study of Yttrium Extraction from Tin Slag Using Hydrochloric Acid Hidayat, Rachmat Fauzi; Trinopiawan, Kurnia; Mubarok, Mohammad Zaki; Rommy, Rommy; Prassanti, Riesna; Putra, Aditya Widian; Ekaputri Hidayat, Amalia; Setiawan Widana, Kurnia; Purwanti, Tri; Laksmana, Roza Indra; Basuki, Triyono; Pratama, Afiq Azfar; Indryati, Suci
EKSPLORIUM Vol. 46 No. 2 (2025): NOVEMBER 2025
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/eksplorium.2025.13299

Abstract

Tin slag, a byproduct of tin smelting, comprises several important metals, including yttrium, tantalum, manganese, iron, aluminum, titanium, and others. As an element that is used a lot in advanced materials, the separation of Yttrium becomes one of the most important steps in rare earth elements extraction. By using the alkali fusion process and leaching method, yttrium in the tin slag has been successfully extracted. The tin slag was subjected to an alkali fusion treatment with sodium hydroxide at a temperature of 700 °C, and the frit was ground into several particle sizes of +100 to -325 mesh using a laboratory ball mill and mortar. The frit was then leached using hydrochloric acid, with four parameters used: temperature, acid concentration, particle size, and stirring speed. The extracted yttrium reached a percentage of up to 86.94% at a temperature of 80 °C, acid concentration of 2 M, particle size of -325 mesh, and stirring speed of 150 rpm.
Co-Authors Ekaputri Hidayat, Amalia Henny Purwaningsih Hidayat, Rachmat Fauzi Indryati, Suci Jaka Rachmadetin Kurnia Trinopiawan Laksmana, Roza Indra Mohammad Zaki Mubarok, Mohammad Zaki Muhammad Farid Nakashima, Satoru Noerpitasari, Erlina Pratama, Afiq Azfar Purwanti, Tri Putra, Aditya Widian Riesna Prassanti Rommy, Rommy Saputra, Dwi Luhur Ibnu Setiawan Widana, Kurnia Sihotang, Juan Carlos