SINTESIS DAN KARAKTERISASI KOMPOSIT BEADS NANOSELULOSA BERBASIS LIMBAH TANDAN KOSONG KELAPA SAWIT (Elaeis guineensis Jacq) SEBAGAI ADSORBEN METHYLENE BLUENIM.: 22106030021Wiwin ArfanudinauthorThe deterioration of water quality due to industrial wastewater, particularly from dyes such as methylene blue, has driven the need to develop effective and environmentally friendly adsorbent materials. This study aims to isolate nanocellulose from oil palm empty fruit bunch (OPEFB) waste, synthesize composite beads based on nanocellulose, mesoporous silica, and sodium alginate, and investigate the adsorption mechanism of methylene blue. Nanocellulose was obtained through a series of processes including delignification, bleaching, TEMPO-mediated oxidation, and ultrasonication, and subsequently synthesized into beads using an ionic gelation method with CaCl₂. Characterization was carried out using FTIR, XRD, SEM, TEM, and TGA, while adsorption experiments included variations in contact time, adsorbent dosage, solution pH, and Isoterm analysis. The results showed that nanocellulose was successfully isolated with an average diameter of 3,83 nm and possessed active functional groups that support the adsorption process, while the resulting composite beads exhibited a stable structure and porous morphology. The contact time study indicated that adsorption occurred rapidly at the initial stage and reached equilibrium at 180 minutes. Increasing the adsorbent dosage enhanced adsorption efficiency due to the greater availability of active sites on the adsorbent surface. Adsorption performance was influenced by operating conditions, with optimum results at pH 7, and followed the Freundlich Isoterm model, indicating a heterogeneous surface characteristic.Overall, nanocellulose-based composite beads derived from OPEFB demonstrate significant potential as an effective and sustainable adsorbent for dye wastewater treatment.543 Kimia Analitikal, Kimia Analisis2026-05-07UIN SUNAN KALIJAGA YOGYAKARTA;FAKULTAS SAINS DAN TEKNOLOGIThesis