Adsorption Study of Rhodamine B and Methylene Blue Dyes with ZSM-5 Directly Synthesized from Bangka Kaolin without Organic Template

Ani Iryani (Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Pakuan, Jl. Pakuan, Tegallega, Bogor 16143, Indonesia Department of Chemistry, Faculty of Science, Institut Teknologi Sepuluh Nopember, Keputih, Surabaya 60111, Indone)
Hadi Nur (Ibnu Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, Johor, Malaysia)
Mardi Santoso (Department of Chemistry, Faculty of Science, Institut Teknologi Sepuluh Nopember, Keputih, Surabaya 60111, Indonesia)
Djoko Hartanto (Department of Chemistry, Faculty of Science, Institut Teknologi Sepuluh Nopember, Keputih, Surabaya 60111, Indonesia)

Indonesian Journal of Chemistry
Vol 20, No 1 (2020)

Rhodamine B (RB) and Methylene Blue (MB) dyes adsorption using adsorbent ZSM-5 synthesized from Bangka kaolin were investigated in this study. The effects of the initial concentration, contact time and temperature on the adsorption process were also analyzed. The effect of the initial concentration and contact time played an important role in the adsorption process; however, the effect differs significantly in both dyes. The temperature plays little role in the dye adsorption process. The results showed the adsorption process occurred in ZSM-5 adhere to Langmuir isothermal adsorption model showing that the adsorption process occurred to be monolayer. Based on the kinetics studies, the pseudo-first-order kinetic model represents the adsorption kinetics that occurs for both dyes onto the synthesized ZSM-5. Thermodynamic parameters namely Gibbs free energy (ΔG°), standard entropy changes (ΔS°) and standard enthalpy (ΔH°) reveal that the adsorption process onto ZSM-5 for both dyes was spontaneous and exothermic.