Abstract:
Clay is composed of (AlO4)5- octahedral and (SiO4)4- tetrahedral with water molecules
moving freely in their cavities. Metal ions, usually alkaline earth metals (Na, K, Mg, Ca, and
Fe) fill the cavity. Due to its chemical composition and structure, clay minerals have the
potential to be used as ion exchangers, adsorbents, and molecular filters in wastewater
treatment. This study aims to determine the adsorption capacity of silver nanoparticle
modified clay in adsorbing methylene blue. In this study, the silver nanoparticle modified
clay synthesis process was carried out using a two-step adsorption - reduction method. The
value of the adsorption capacity of methylene blue by silver nanoparticle modified clay
was 31.10 mg/g with an adsorbent dose of 80 mg, methylene blue concentration of 50 ppm,
contact time 20 minutes, pH 11, and at 40℃. The adsorption mechanism that occurs involves
electrostatic interactions between methylene blue dye cations and the negative charge (-OH)
on the clay surface.
