Characterisation of silica derived from rice husk (Muar, Johor, Malaysia) decomposition at different temperatures

Azmi, Mohd Azham; Ismail, Noorli; Rizamarhaiza, M.; K., W. M. Hasif. A. A.; Taib, Hariati

doi:10.1063/1.4958748

Cited by 31 publications

(13 citation statements)

References 10 publications

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“…The predominant intensity peaks at wavenumber range of 900 -1100 cm -1 that was observed in both RHA and SLSG might be attributed to Si -O -Si asymmetric bending and stretching vibration bonds indicating the presence of siloxane structural bonding as reported by [22 -23]. This is in similarity with what was observed for synthetic silica reported by [24]. Weak peaks recorded at wavenumber range 700 -800 cm -1 in the spectra of both RHA and SLSG can be attributed to stretching of symmetric Si -O bond referred to as Silanol as reported by [22].…”

Section: Resultssupporting

confidence: 88%

A Novel Low Temperature Synthesis of Sodium Silicate (Water Glass) from Silica-Rich Wastes using Hydrothermal Method

2021

CMR

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This present work aims at synthesizing sodium silicate solutions from selected industrial wastes (waste glass and rice husks) using hydrothermal method. The as-received waste glasses of different mix colors were initially washed, crushed and wet milled for several hours then sieved through 75µm mesh. The sieved recycled glasses were then oven dried at 110 o C for 72 h to obtain a powdered glass (SLSG). Rice husks were also washed to remove dirt adherence and dried. The dried rice husks were thermally treated in a muffle furnace at 800 o C for 1 h then left to cool to obtain whitish rice husk ash (RHA). Both SLSG and RHA were then reacted with NaOH solution at varying concentration of 3M, 4M and 5M respectively in a 250 ml Erlenmeyer flask. The mixtures were heated with continuous stirring using a magnetic stirrer at temperatures of 150 o C, 170 o C and 200 o C respectively for a reaction period of 4 h. Analyses were carried out on the synthesized sodium silicate solutions. The results obtained from the analyses showed sodium silicate synthesized from RHA possessed high viscosity while the SiO 2 /Na 2 O ratio showed they are commercial sodium disilicates which indicates the products are all sodium silicate solutions.

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Section: Resultssupporting

confidence: 88%

A Novel Low Temperature Synthesis of Sodium Silicate (Water Glass) from Silica-Rich Wastes using Hydrothermal Method

2021

CMR

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“…A notable low intense peak located at 2θ= 21°, while intense high peaks located at 2θ of between 28 and 29°, were observed in all OPDCAs at temperatures 600-900C. According to Inorganic Crystal Structures Database (ICSD), it confirmed OPDCA consists of silica that exists in quartz form (crystalline structure) (Azmi et al, 2016;Saceda et al, 2011). It also has been reported elsewhere to confirm the presence of crystalline silica in ash represented by the sharp peaks (Pa et al, 2016;Utama et al, 2018).…”

Section: Structural Phase Analysissupporting

confidence: 62%

Green Route Synthesis of Amorphous Silica from Oil Palm Decanter Cake: From Literature Review to Experiments

Rahim

Harun

Saeed

et al. 2022

Indonesian J. Sci. Technol

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Numerous agricultural wastes are well-defined as low-cost sources and rich in silica content. The residue of oil palm wastes combustion seems a promising silica source and can be recovered through a straightforward method. In this study, the combustion followed by an alkaline extraction method was employed to extract high purity of silica. The oven-dried oil palm decanter cake (DOPDC) was heated at combustion temperatures of 600, 700, 800, and 900°C to produce OPDC ashes (OPDCA), followed by an alkaline extraction using 5M of NaOH solution. Thermogravimetric analysis (TGA) was used to observe the thermal behavior of DOPDC where the suitable combustion temperatures to produce silica ranged between 600 and 1000 ℃. X-Ray Fluorescence (XRF) analysis showed that silica contents were 31-36% after combustion, increasing to 76.95% after the chemical treatment. Moreover, the spherical shape of the silica was observed through electron microscope analysis. It was represented by the aggregation of silica after going through chemical treatment. The X-Ray Diffraction analysis also proved that the amorphous silica was produced, characterized by the hump-shaped spectrum. The infrared analysis confirmed that the silica had been successfully extracted from OPDCA by the presence of silica functional groups shown in the spectrum.

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“…It was noted that the used procedure for silicon dioxide extraction decreased the elemental carbon content during the thermal treating. This led to even lower values than reported in the literature [32], and highlighted the absence of carbon in the CA HCl -SiO 2 sample. finding showed the efficacy of chemical treatment on contaminant removal.…”

Section: Resultsmentioning

confidence: 39%

Synthesis and characterization of SrO-containing bioglass-ceramic from rice husk silicon dioxide

et al. 2020

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Rice husk is an abundant waste at the Rio Grande do Sul, Brazil, and it can be used to produce pure silicon dioxide, which is the main component of bioglass-ceramics. The addition of compounds, such as SrO, can improve the biocompatibility of these biomaterials. Therefore, the goal of this paper was to use rice husk silicon dioxide as a cheap precursor to obtaining bioglass-ceramics of the system 50%SiO2-25%Na2O-(25-x)%CaO-x%SrO (mol%) by sol-gel and investigate its potential use as a biomaterial. Two samples (BGC blank and BGC-5%Sr) were synthesized and characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and elemental carbon analysis by the combustion method. Scanning electron microscopy (SEM) was used to investigate the morphology of the bioglass-ceramics, while MTT assay of cell viability was used for in vitro characterization. The obtained silicon dioxide was amorphous and presented a small carbon content. Also, the bioglass-ceramics showed main phases with Si, Ca, Na, and Sr on their structure. Both samples were not cytotoxic against peripheral blood mononuclear cells (PBMC), and the incorporation of 5% SrO improved biocompatibility.

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Characterisation of silica derived from rice husk (Muar, Johor, Malaysia) decomposition at different temperatures

Cited by 31 publications

References 10 publications

A Novel Low Temperature Synthesis of Sodium Silicate (Water Glass) from Silica-Rich Wastes using Hydrothermal Method

A Novel Low Temperature Synthesis of Sodium Silicate (Water Glass) from Silica-Rich Wastes using Hydrothermal Method

Green Route Synthesis of Amorphous Silica from Oil Palm Decanter Cake: From Literature Review to Experiments

Synthesis and characterization of SrO-containing bioglass-ceramic from rice husk silicon dioxide

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