SHIRASU BALLOONS AND SHIRASU BALLOONS MODIFIED WITH POLYDOPAMINE (PDA) FOR ADSORPTION OF METHYLENE BLUE

Chairunnisa, Dwi Siswanta

2015 | Disertasi | FMIPA

The development of shirasu balloons (SB) modified with polydopamine (PDA) has been conducted. The aim of this research is to increase the performance of shirasu balloons in the adsorption application towards methylene blue (MB). The SB modified with PDA (SB/PDA) was prepared by immersed SB in the dopamine solution in the aerobic alkaline condition. The prepared material was characterized using FTIR, SEM-EDS, specific surface area N2 sorption, and zeta potential. The adsorption behavior of SB and SB/PDA was investigated by study of effect of pH, adsorption kinetics, and effect of salt concentration. The adsorption kinetics of SB before and after modification was analyzed using two kinetics models i.e. pseudo-first-order and pseudo-kinetics-order. The adsorption isotherm model was analyzed using Langmuir and Freundlich isotherm model.The adsorption study result showed that the adsorption isotherm was fitted to Langmuir isotherm model at 25 °C with maximum capacity could reach up to 26.17 mg g-1 for SB only and 36.23 mg g-1 for SB/PDA. Adsorption kinetics showed that adsorption behavior followed the pseudo-second-order kinetic model.

Kata Kunci : shirasu balloons; polydopamine; adsorption; methylene blue.