PREPARASI ALUMINA MENGGUNAKAN METODE HIDROTERMAL DAN APLIKASINYA UNTUK ADSORPSI ZAT WARNA METIL ORANGE
Daftar Isi:
- The research about preparation of alumina using hydrothermal method followed by calcination to convert Al(OH)3 to Al2O3 had been done. Calcination was carried out with variations in temperature of 600°C, 700°C, 800°C and 900°C. The best calcined alumina is used as an adsorbent for methyl orange dyes. The calcined alumina temperature of 900°C produces a sludge (% yield) of 66.53% of the 100% aluminum hydroxide produced where 33.47% lost is water that has evaporated when calcined. Characterization of alumina was carried out using XRD, FTIR, SEM-EDX and BET. Characterization of XRD shows the crystallinity of calcined alumina similar to one another and calcined alumina at 900°C has the highest intensity and sharpest. Characterization of FTIR showed that alumina has an Al-O group. Characterization of SEM-EDX shows a rough, porous and non-homogeneous surface with Al and O constituent elements. Characterization of BET shows alumina has surface area, pore volume and pore diameter each of 85.1834 m2/g, 0.000587 cm2/g and 12.96961 nm. The results of XRD, FTIR, SEM-EDX and BET characterization showed that alumina preparation was successful. Alumina has a pH PZC of 7. The optimum conditions for adsorption of methyl orange dyes by alumina are calcined at 900°C, at 20 minutes of contact time and 0.06 grams of alumina weight. In this study, standard alumina (merck) was used as a comparison. The alumina adsorption isotherm of methyl orange dyes follows the Freundlich equation with a regression value of R2 = 0.9885, n = 0.5220 and KF = 6.3655. The adsorption ability test was carried out where the standard alumina had the largest % adsorption which was 87.062% while the calcined alumina and aluminum sulfate each had %adsorption of 72.799% and -57,938%.