Synthesis of Silica Powder from Sugar Cane Bagasse Ash and Its Application as Adsorbent in Adsorptive-distillation of Ethanol-water Solution

Abstract

In this study, sugarcane bagasse ash (SCBA) as waste from sugarcane factory was extracted into silica powder. This powder was then used as adsorbent for ethanol purification. Prior to used, the SCBA was washed using HCl solution. The silica extraction was conducted using various NaOH concentrations (0.5; 1; 1.5 and 2 mol/L) as well as extraction times (30, 60 and 90 minutes). After that the mixture was precipitated using HCl solution. The solution was filtrated through a paper filter and its solid particle was dried until its weight was constant. The particle was grounded and sieved using 18 mesh sieves. The silica powder obtained was analysed using FTIR and its result showed that the powder has silica functional groups. The silica yield increases with increasing of concentration of NaOH solution as well as extraction time. The highest silica yield (45.5% w/w) was achieved at 2 mol/L NaOH solution at 90 min. The surface area, pore diameter, and pore volume of silica powder were measured to be 407 m2/g, 3.81Å, and 2.76 dm3/g, respectively. From application of silica powder as adsorbent in adsorptive-distillation, ethanol concentration can reach 99.3% w/w which indicates azeotropic point can be passed.

Valorization of Sugarcane By-Products through Synthesis of Biogenic Amorphous Silica Microspheres for Sustainable Cosmetics

“…The greatest silica yield was obtained for the silica gel process, 198 g silica/kg SCBA, while the precipitated silica microparticles process provided a yield of 178 g silica/kg SCBA. These silica extraction yields were much lower than others reported for similar biomasses, ranging from 45 to 90% for sugarcane or rice husk ashes, mainly due to the high loss of biomass during the sieving process, which allows the production of 100% biogenic silica [ 9 , 11 , 22 , 25 ].…”

“…Although several works have focused on the production of silica from biomass ashes, particularly from rice husk and sugarcane fly ashes, these materials are commonly assigned to material applications [ 5 , 6 , 7 , 8 ]. Methods for extraction of amorphous silica from sugarcane bagasse ash mostly include acidic pretreatment (mostly with HCl) followed by alkaline extraction with NaOH at 95 ± 5 °C and a precipitation step with HCl to neutralize the solution [ 9 , 10 , 11 ]. These methods allow high-purity silicas (99%) to be obtained, although they lack a finalization step that allows spherical particles suitable for cosmetics to be obtained.…”

Effect of Calcination Temperature on the Synthesis of Silica from Bagasse

“…The greater the NaOH concentration used, the more silica that can be extracted. The research conducted by Megawati [3] showed that 2.0 M NaOH was the optimum concentration for silica extraction from bagasse ash. Likewise, other studies' show that 1.0 M NaOH concentration could extract 91% silica while the NaOH concentration less than 0.1 M was unable to extract silica [11].…”

“…Some of the bagasse is used as fuel for heating the boiler. In this process, 8-10% of solid waste is produced in the form of ash [3]. Bagasse ash cannot be used as fertilizer because it is low in nutrients and even increases heavy metals concentration in the soil, for example Al2O3, Fe2O3, MnO, Cr2O3, NiO [4,5].…”

Extraction yield and properties of biogenic silica from palm oil fuel ash: effect of re-ashing pretreatment and solvent concentration

“…Setyawan et al [25] reported that extraction of biosilica from fresh rice husks (not ashed) resulted in a low extraction yield (9.03%), whereas when ashed, rice husks produced an extraction yield of 62.83% [26]. Megawati et al [27] prepared raw materials by re-ashing sugarcane bagasse ash (SCBA) using a furnace for 3h at 600 o C to reduce carbon content. The extraction yield of re-ashed SCBA was 45.5% at a concentration of 2mol/L NaOH solution with an extraction time of 90min.…”