Preparation and Characterization of Faujasite using Fly Ash and Amorphous Silica from Rice Husk Ash

Synthesis of silica nanopowder produced from Indonesian natural sand via alkalifussion route

“…3. The xrd pattern exhibits a wide peak and low intensity (~ 150-200 counts) revealing that the silica powder is an amorphous phase with the particle size of the order nanometer (< 100 nm), it is in accordance with the result obtained by nittaya [2] and van hoek [7] which was also confirmed by tem characterization. Based on the xrd data, again, the presence of peaks at 2ș arround 20 o to 35 o has the same pattern with the data reported by nittaya [8] and the previous studies, it is the unique xrd profile of an amorphous silica.…”

“…It has so far been produced a very high purity of silica up to more than 99% from baggase ash (organic material) [1]. A 98% purity of nano-silica has also been fabricated from rice husk ash by means of coprecipitation [2] and a 95.7% of nano-silica from Sidoarjo mud by also means of coprecipitation as well [3]. Trabelsi, et al, have completely synthesized an amorphous silica from inorganic material, i.e., natural sand from Deuriet, by reacting sodium carbonate (Na 2 CO 3 ) with heating temperature of 1030 °C [4].…”

“…At this final step, water was evaporated in furnace. The reaction processes that may occur are as the following [1][2][3][4]6]: SiO 2 (sand powders) + NaOH AE Na 2 SiO 3 (l) + H 2 O (l) (1) Na 2 SiO 3(l) +2HCl (l) +H 2 O (l) AE2NaCl (s) +Si(OH) 4(aq) (2) Si(OH) 4(aq) AE SiO 2(s) + 2H 2 O…”

Preparation and characterization of nano-porous silica aerogel from rice husk ash by drying at atmospheric pressure

“…There is a broad peak between 208 and 308 (2u) in both graphs, which is in agreement with (PDF no: 47-715). This pattern is characteristic of amorphous SiO 2 [26]. XRF analysis of silica aerogel with and without TEOS is shown in Table 4, which indicates that silica aerogel with TEOS contains more silicon and lower LOI suitable for quantitative analysis, because the reactions of Si-OH in the silica and Si-OC 2 H 5 in tetraethyl orthosilicate lead to siloxane (Si-O-Si) bonds formation.…”

Effect of the SiO2/Al2O3 ratio on the synthesis of Na-x zeolite from Mae Moh fly ash

“…The fusion products were identified by determining the chemical composition using wavelength dispersive X-ray fluorescence spectrometer (XRF) to compare SiO 2 /Al 2 O 3 ratio of Na-x zeolite reference ( Table 2). The fused products were ground and mixed with 100 ml distilled water 4,20 , followed by vigorous shaking in Dual-Action Shakers (NB-101 MT, N-Biotex, Inc., Korea) at room temperature for 3 h. After ageing for 24 h, the slurry was incubated and crystallized autogenously at 70°C for 24 h 21 . The solid crystalline products were recovered by filtration method and then washed with distilled water until the filtrate pH was 10-11.…”