Abstract
Adsorption is an effective process to remove organic compounds, including surfactants. In this research, rice straw (JP) and eggshell waste (CT) would be tested as economically adsorbents of surfactant. This research aims to determine the effect of pH, adsorbent dose, initial concentration, and particle size on adsorption effectivity, find out kinetics, removal efficiency and desorption ability of adsorbents. Anionic surfactant Linear Alkylbenzene Sulfonate (LAS) was determined by using MBAS method. A preliminary test was conducted to examine which adsorbent is the potential to be used in the main experiment. Adsorbent selected from the preliminary test was CT2 and JP1. Surfactant removal at an acidic solution was better than in an alkaline solution. The particle size of adsorbent was not influencing much at removal of surfactant. As increasing dosage, removal efficiency increases. Removal efficiency decreases as initial concentration is increased. Isotherm D-R fitted well for both adsorption and desorption using JP; therefore Langmuir isotherm fitted well for CT. Removal efficiency of LAS adsorption was better using JP than CT adsorbent. Desorption release at CT was 9.68-20.94%, while for JP was 8.51-12.20%. Pseudo-second order and second-order models fitted data well for adsorption kinetics. Physisorption was dominant in the adsorption process.
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