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All Journal Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Deden Dharmawan
Department of Chemistry, Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Indonesia
Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Engineering Materials Science & Nanotechnology

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Adsorption of Thorium(IV) from Aqueous Solution Using Natural Bentonite from Pacitan, Indonesia Amalia Ekaputri Hidayat; Suci Indryati; Roza Indra Laksmana; Inda Robayani Walayudara; Deden Dharmawan; Rommy; Aditya Widian Putra; Afiq Azfar Pratama; Rachmat Fauzi Hidayat; Saka Wahyu Hidayat
EKSPLORIUM Vol. 47 No. 1 (2026): MAY 2026
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/eksplorium.2026.15458

Abstract

Separating and utilizing thorium from industrial by-products is essential for economic, energy, and environmental reasons. Natural bentonite can be an effective adsorbent for removing various contaminants, including thorium. This study aims to determine the effectiveness of natural bentonite from Pacitan as an adsorbent for thorium removal. Batch adsorption experiments were conducted using a surrogate thorium solution to evaluate the effects of adsorbent dosage, contact time, and adsorption kinetics and isotherms. The study shows that the adsorbent's pHpzc is 7. The adsorbent also shows a cation-exchange capacity of 90.69 meq/100g. The adsorption experiments revealed that using 0.1 g of adsorbent in a 50 mL solution containing 100 ppm thorium yielded an adsorption efficiency of 99.34%. Experimental observations determined an optimum contact time of 120 minutes with 99.80% efficiency. The adsorption data were well-fitted by the pseudo-second-order kinetic model and the Langmuir isotherm, suggesting chemisorption-dominated behavior consistent with monolayer coverage on homogeneous active surface sites. These findings indicate that natural bentonite from Pacitan is a promising, cost-effective material for removing thorium from wastewater.
Co-Authors Aditya Widian Putra Afiq Azfar Pratama Amalia Ekaputri Hidayat Inda Robayani Walayudara Rachmat Fauzi Hidayat Rommy Roza Indra Laksmana Saka Wahyu Hidayat Suci Indryati