#TITLE_ALTERNATIVE#

• Main Author: SAVIRA ERSA (NIM: 25313302), NANDA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/29535
• Institution: Institut Teknologi Bandung

<p align="justify">Surfactant is one of contaminants found in wastewater. Adsorption is an effective process to remove organic compounds. As the increasing of pollution, economically adsorbent is become necessary to develope. In this research, eggshell waste and rice straw would be tested as adsorbents of surfactant. The aims of this research are to determine the effect of pH, adsorbent dose, initial concentration and particle size on adsorption effectivity, to found out mechanism of surfactant removal in water and also desorption ability of adsorbents. Anionic surfactant, Linear Alkylbenzene Sulfonate (LAS) was determined by using MBAS method. Preliminary test is conducted to examine which adsorbent is potential to be used in main experiment. General condition in this experiment is arranged at neutral pH, 20 g dosage adsorbent and with particle size retained 50 mesh. Adsorbent selected from preliminary test was JP1 and CT2. Surfactant removal at acidic solution was better than alkaline. Particle size of adsorbent did not seem to have a systematic effect on adsorption of surfactant LAS. Removal efficiency decrease as initial concentration was 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 using JP and CT at general condition was 59.10% and 43.93%, repectively. Desorption release at CT was 9.68-20.94%, while for JP was 8.51-12.20%. Pseudo-second order and second order model fitted data well for adsorption kinetics. Gibbs free energy describes that reaction using JP was run spontaneously, while using CT was unspontaneously. Fisisorption was dominant at adsorption process using both adsorbent through van der Waals force and electrostatic interaction.<p align="justify">