Interlayer Modification of West Java Natural Bentonite as Hazardous Dye Rhodamine B Adsorption

Satria Jaya Priatna (Department of Soil Science, University of Sriwijaya, Indralaya, 30862, South Sumatera, Indonesia)
Yusuf Mathiinul Hakim (Graduate school, Faculty of Mathematic and Natural Sciences, Sriwijaya University, Palembang, 30139, South Sumatera, Indonesia)
Sahrul Wibyan (Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Sriwijaya, Indralaya, 30862, South Sumatera, Indonesia)
Siti Sailah (Department of Physics, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Palembang, 30139, South Sumatera, Indonesia)
Risfidian Mohadi (Graduate School, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Palembang, 30139, Indonesia)

Science and Technology Indonesia
Vol. 8 No. 2 (2023): April

This work reports the modification of West Java natural bentonite as an effective adsorbent for rhodamine B dye. The modification was finished by sodium intercalation at room temperature to get low-energy preparation. Characterization of bentonite-modified adsorbent was used SEM, XRD, FTIR, and BET analysis. The material pore size and surface area were increased by 0.303 nm and 178.710 m2/g on Na-bentonite. The adsorption mechanism conformed well with the Freundlich isotherm model and pseudo-second-order kinetics equations. The adsorption process by thermodynamic analysis was endothermic and advantageous. Under the optimum condition of pH 6 (confirmed by pHpzc), initial dye concentration of 125 mg/L, and the adsorbent dosage of 0.09 g for 65 minutes, the Na-bentonite has a larger adsorption capacity (Qm) of 142.86 mg/g, while the different adsorbent dosages of 0.11 g for 75 minutes, the adsorption capacity of natural bentonite (Qm) reaches 140.85 mg/g. This work provides a method for establishing a low-energy preparation adsorbent of bentonite-based on Na intercalant as a low-cost and valuable adsorbent for waste dye removal.