Pengaruh Temperatur Kalsinasi pada Ekstraksi Silika dari Abu Cangkang Kelapa Sawit

Abstract

Has conducted research on the effect of temperature on the extraction of silica from the ashes of palm kernel shells. ash shell in purified with hydrochloric acid which aims to minimize other minerals contained in the ashes of palm kernel shells. Silica obtained from the ashes of palm shells were extracted with sodium hydroxide followed by re precipitation using hydrochloric acid to obtain silica and large surface area. FT-IR data obtained have similarities with commercial silica. XRD diffractogram also showed a widened peak in the area 22,0o showed that shaped amorphous silica. The results of nitrogen adsorption desorption isotherm of silica at calcination temperature of 300oC, 500oC, 700 ° C shows the adsorption isotherm Type IV and at a temperature of 900oC is an adsorption desorption isotherm type V which is characteristic of mesoporous material and pore size distribution obtained at the calcination temperature to 300oC between 1.72 to 6, 28 nm, temperature of 500oC between 1.73 to 47.20 nm, 700°C is 1.72 to 8.95 nm, and the calcination temperature of 900oC 1.79 to 41.73nm. As well as the volume and surface area silica based on the calculation of BJH each on the calcination temperature to 300oC pore volume: 0.7043 cm3 g -1, surface area: 450.1755 m 2 g -1, temperature of 500oC pore volume: 0.6838 cm3 g -1, surface area: 464.6172 m2 g -1 , 700oC pore volume: 0.5619 cm3 g -1 surface area: 222.7502 m2 g -1 and at a temperature of 900oC calcination obtained pore volume: 0.1991 cm3 g -1 and the surface area of the silica: 26.9487 m2 g -1 .