Adsorption of Remazol Black B Using Magnetic-Silicane-Graphene Oxide (MM-SiO2/GO) Composite

Fahmiati (Department of Chemistry. Faculty of Mathematics and Natural Sciences. Halu Oleo University. Kendari. Indonesia.)
Armid (Department of Chemistry. Faculty of Mathematics and Natural Sciences. Halu Oleo University. Kendari. Indonesia.)
L.O.A. Usman (Department of Chemistry. Faculty of Mathematics and Natural Sciences. Halu Oleo University. Kendari. Indonesia.)
D. Ismail (Department of Chemistry. Faculty of Mathematics and Natural Sciences. Halu Oleo University. Kendari. Indonesia.)
L. A. Kadir (Department of Chemistry. Faculty of Mathematics and Natural Sciences. Halu Oleo University. Kendari. Indonesia.)

International Journal of Acta Material
Vol. 2 No. 1 (2025): August 2025

Adsorption of Remazol Black B dye using a magnetic material composite of iron sand-silica-graphene oxide (MM/SiO2/GO) has been conducted. This study aimed to determine the characteristics of the iron-silica-graphene oxide magnetic material composite and the effects of pH, concentration, contact time, and temperature variations on the composite's adsorption of Remazol Black B dye. The optimum adsorption of Remazol Black B on MM/SiO2/GO occurs at pH 5. The adsorption process tends to follow the Langmuir adsorption isotherm model, with a Langmuir constant value of -70.95 L.g-1. Adsorption of Remazol Black B on MM/SiO2/GO occurs rapidly within 5-30 minutes and continues to increase in capacity until 240 minutes. The kinetics of Remazol Black B adsorption on MM/SiO2/GO followed the second-order pseudo reaction kinetics model, with a k₂ value of 2.47 g/mg.min-1. Effective adsorption of Remazol Black B on MM/SiO2/GO occurred at 40 °C, proceeding spontaneously with a value of ∆G° = -5.131 kJ/mol.