SINTESIS DAN KARAKTERISASI KARBON MESOPORI DARI GELATIN TULANG SAPI SERTA APLIKASINYA SEBAGAI ADSORBEN DIBENZOTIOFEN; SYNTHESIS AND CHARACTERIZATION OF MESOPOROUS CARBON FROM GELATIN OF COW BONE AND ITS APPLICATION AS DIBENZOTHIOPHENE ADSORBENT
Ulfa, Maria, Wega Trisunaryanti
2015 | Tesis | FMIPAMesoporous carbon is interesting materials due to their unique properties such as regular mesoporous pore structure, large surface area, pore diameter, inert and high thermal stability. Synthesis of mesoporous carbon by using gelatin as carbon precursor on previous research has resulted in the low textural parameter product. The aim of this work was to synthesis mesoporous carbon with better textural parameter than previous research by using gelatin as carbon precursor and SBA-15 as hard template. The next work was application of mesoporous carbon in dibenzothiophene adsorption. The research was separated into 3 steps. Step 1 described extraction of gelatin derived from bones of cow by a sequential extraction process using the combination of alkali and acid pretreatment at various time, acid concentration and temperature extraction. FTIR spectrophotometer, SEM-EDAX, DTA-DSC, and electrophoresis were conducted on the gelatins extracted. Step 2 described the synthesis of mesoporous carbon by sequential impregnation of hard template from gelatin as the carbon precursor. Gelatin was infiltrated onto SBA-15 template at sequence carbonisation step at 110 and 160 °C for 7 h then pyrolysed at 900 °C for 3 h under argon atmosphere. The mesoporous carbon materials were characterised by SAXRD, SAXS, TEM, DTA/DSC, FTIR spectrophotometer and surface area analysis. The series of the mesoporous carbon samples was prepared by varying amount of gelatin to SBA-15, the ratio of gelatin-to-sulfuric acid, impregnation step, temperature, time and HF concentration of the template removal. In the last step, mesoporous carbon was used as adsorbent of dibenzotiophene (DBT). Gelatins extracted at the optimum condition had molecular weight at 90- 110 kDa with containing carbon and nitrogen of 48 and 15%, respectively. The best mesoporous carbon at optimum condition had a surface area of 756 m2/g, total pore volume of 0.999 cm3/g, mesoporous ratio to total pore of 81% and narrow pore size distribution at peak of 4.06 nm with hexagonally packed tubular structure. The equilibrium was obtained within 70 min with the maximum adsorption capacity of DBT by mesoporous carbon was 66.6 mg/g at pseudo second order. The change of Gibbs free energy of -14.8 kJ mol-1 indicated the spontaneous adsorption. The heating process is the best way to regenerate mesoporous carbon materials. The regenerated adsorbent resulted in adsorption capacity after regeneration cycles of 84, 56 and 48%, respectively.
Kata Kunci : adsorption; dibenzotiophene; gelatin; mesoporous carbon
