KAJIAN PENGARUH WAKTU SONIKASI, JUMLAH PREKURSOR, DAN METODE PENGHILANGAN SURFAKTAN TERHADAP KRISTALINITAS PRODUK DALAM SINTESIS MCM-48 DARI SEKAM PADI; STUDY OF THE SONICATION TIME, PRECURSOR AMOUNT, AND SURFACTANT REMOVAL METHODS TOWARDS THE CRYSTALLINITY OF SYNTHESIZED MCM-48 FROM RICE HUSK
ROSITA, FITRA ISNI, Suyanta
2016 | Skripsi | FMIPAStudy of the influence of sonication time, the amount of precursor, and surfactant removal methods towards the crystallinity of MCM-48 has been carried. The purposes of this research were to synthesis MCM-48 materials from rice husk using sonochemistry method, determine the effect of sonication time and the amount of precursor towards the MCM-48 crystallinity, and comparatively study of surfactant removal methods. Extraction of silica from rice husk was carried out at 60 °C for 3 hours using HCl as a solvent. MCM-48 was synthesized using cetyltrimethylammonium bromide (CTMABr) as surfactant and were performed under a variation of sonication time of 90, 120, 150, and 180 minutes and under the amount variation of precursor as much as 1 recipe (i.e. 0,067 mol SiO2, 0,031 mol NaOH, 0,014 mol CTMABr, and 5 mol H2O), 3/4 recipe (i.e. 0,05 mol SiO2, 0,016 mol NaOH, 0,01 mol CTMABr, and 3,75 mol H2O), and 1/2 recipe (i.e. 0,033 mol SiO2, 0,016 mol NaOH, 0,0069 mol CTMABr, and 2,5 mol H2O). Surfactant removal of MCM-48 were carried out by sonication using ethanol 70% as a solvent, calcinations at 500 ºC for 4 hours, washing with 1:10 ammonium carbonate-ethanol, and washing with 0,1 M HCl-ethanol. MCM-48 were characterized by X-Ray Diffraction (XRD), Fourier Transform Infra Red (FTIR) Spectroscopy, Scanning Electron Microscope (SEM) and adsorption-desorption of N2 methods. The result showed that MCM-48 can be formed at the time of sonication for 120 minutes and the amount of precursor of 1 recipe. Surfactant removal using HCl-ethanol is the best method in this study for removing CTMABr from MCM-48. The result of characterization using SEM showed particle agglomeration, while the characterization using adsorption-desorption of nirogen gas showed that the specific surface area of MCM-48 was 25.85 m² g-1, the specific pore volume was 0.083 cc g-1, and the average pore diameter up to 12.97 nm.
Kata Kunci : MCM-48, rice husk , sonication, the amount of precursor
