Effect of MgO-SiO2 Ratio on the Forsterite (Mg2SiO4) Precursors Characteristics Derived from Amorphous Rice Husk Silica

Abstract

This study acquires the potential of rice husk silica for production forsterite precursors using sol-gel method. The samples preparation were conducted by mixing magnesium oxide sol from Mg(NO 3 ) 2 .6.12H 2 O with silica sol extracted from rice husk, with three different composition ratios of MgO to SiO 2 are 1:1, 2:3 and 3:2 by weight and sintered at 900 o C. The samples were characterized using Fourier transform infrared (FTIR) spectroscopy, x-ray diffraction (XRD),differential thermal analysis (DTA), followed by scanning electron microscopy (SEM). The FTIR results showed the presence of Si-O-Si, Mg-O and Mg-O-Si functional groups, which were associated with forsterite, enstatite, cristobalite and periclase, according to the XRD analysis. The formation of forsterite (Mg 2 SiO 4 ) is composition-dependent as revealed the increase of forsterite intensity after sintered at 900 o C in ratio 3:2. The surface morphology of non-sintered samples shows that particle and grain size were larger than particle and grain size of sintered samples. Also, SEM analysis of sintered samples clearly shows the presence of regular particle size with smaller grain size was found in ratio of MgO to SiO 2 is 3:2. DTA analysis revealed that the formation of forsterite increased with increasing temperature. In addition, the electrical resistivities of the samples were found in the range of 0.75 x 10 13 to 3.30 x 10 13 Ω-cm, demonstrating that the samples exhibit good potential as isolator.

Bituminous Composite Comprising Amorphous Silica From Rice Husks

“…Based on several studies, the potential of rice husks was investigated in recognition of its high purity and reactive silica [1][2], and the solubility of the silica in an alkaline solution, thus enabling the production of rice husk silica in the form of sols. In addition, rice husk silica is known as a porous and high-grade amorphous material [3][4][5][6][7], which has the potential to become a suitable raw material for the production of various silica-based materials, such as the production of a nano-silica [1,[8][9], zeolite [10][11][12], mullite [13][14], forsterite [15][16], nepheline [17] and cordierite [18].…”

Preliminary Study on Functional Groups Characteristics of Asphalt Containing Rice Husk Silica

“…Plenty efforts have been performed to utilize silica rice husks to produce various silica-based materials, such as nanosilica production [13] and [14]. In our previous study, several ceramic materials derived from silica rice husks reported in the literature were borosilicate [15], carbosil [16], aluminosilicate [17], mullite [18].…”

Synthesis and characterization of asphalt composite precursors using amorphous rice husk silica

“…Preparation of asphalt composite: rice husk silica was produced using alkali extraction method following the procedure reported in a previous study [23]. In this stage, 50 g dried husk was mixed with 500 mL of 5% KOH solution in a beaker glass, boiled for 30 min, and followed to cool to room temperature and left for 24 h. The mixture was filtered to separate the filtrate which contained silica sol.…”

“…Many researchers have investigated the potential of rice husk as an excellent source of high-grade amorphous silica, which can be extracted by relatively simple methods [13][14][15]. Due to the high surface area, high degree of amorphization, and fine particle size, rice husk silica has been shown to be a good material for the preparation and synthesis of various materials such as the production of nanosilica [16,17], borosilicate [18], carbosil [19], aluminosilicates [20], mullite [21], cordierite [22], and forsterite [23]. Taking advantage of rice husk silica characteristics, the main objective of this study is an exploration of rice husk silica to provide some insight into choosing the basic materials in design and preparation of asphalt composite for roof materials as a substitute for lightweight steel roof with a variation of silica.…”