Composition and structure of amorphous silica produced from rice husk and straw

Земнухова, Л. А.; Панасенко, А. Е.; Tsoi, E. A.; Fedorishcheva, G. A.; Шапкин, Н. П.; Artemyanov, Andrey P.; Maiorov, V. Yu.

doi:10.1134/s0020168514010208

Cited by 30 publications

(8 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9 in Table 2). Both of the spectra contain the absorption bands at 467, 799, and 1093 to 1099 cm −1 related to the valent and deformation vibrations of Si-O-Si siloxane bonds present in amorphous silicon dioxide (Zemnukhova et al 2014b). The spectrum of the commercial SiO2·nH2O (Fig.…”

Section: Resultsmentioning

confidence: 99%

Dependence of Porosity of Amorphous Silicon Dioxide Prepared from Rice Straw on Plant Variety

et al. 2015

View full text Add to dashboard Cite

Contents of silica and extractive substances in rice straw depending on rice varieties were investigated. The samples of amorphous silica were prepared, their microelement composition and morphology were investigated, and the values of true and bulk density were estimated. The porous structure of the samples was studied by the Brunauer-EmmettTeller (BET) method and by water vapour sorption; the specific surface values, as well as the pore diameter and volume, were also determined. Sorption properties of the SiO2 surface were analyzed on a sample of Mn 2+ -ions and the organic dyes brilliant green and methylene blue.

show abstract

Section: Resultsmentioning

confidence: 99%

Dependence of Porosity of Amorphous Silicon Dioxide Prepared from Rice Straw on Plant Variety

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The broad and narrow absorption bands at 1096 and 1100 cm −1 on the infrared spectra of nanocomposite and microcomposite, respectively, are attributed to the asymmetrically stretching vibration modes of Si-O-Si bonds. The absorption band at 791 and 792 cm −1 on the infrared spectrum of ACaS and SCaS, respectively, could be assigned to the Si-O-Si of amorphous silica [23,24]. This band observed on the infrared spectrum of SCaS is superimposed with the one of cristobalite.…”

Section: Infrared Spectramentioning

confidence: 84%

Preparation of low-cost nano and microcomposites from chicken eggshell, nano-silica and rice husk ash and their utilisations as additives for producing geopolymer cements

Tchakouté

Mabah

Rüscher

et al. 2020

Journal of Asian Ceramic Societies

View full text Add to dashboard Cite

This work aims to prepare low-cost nanocomposite and microcomposite with lower molar ratio CaO/SiO 2 (0.4). Nano-silica, rice husk ash and calcined chicken eggshell have been used as silica and calcium sources. Metakaolin has been separately replaced by 0, 10 and 20 wt% of each composite in order to study their behavior on the properties of geopolymers. The hardener used is sodium waterglass from rice husk ash. The surface area of nano-silica and rice husk ash was 54.40 and 4.08 m 2 /g, respectively. The cumulative volumes of the control geopolymer, the ones containing 10 wt% of microcomposite and nanocomposite are 119.71, 89.92 and 110.49 mm 3 /g, respectively. The compressive strength of the control specimen is around 64.02 MPa. The one using 10 wt% of microcomposite was 68.97 MPa. It drops to 42.88 MPa when metakaolin was replaced by 20 wt % of microcomposite. Whereas the one using 10 wt% of nanocomposite was 30.03 MPa and it decreases to 26.05 MPa when metakaolin was substituted by 20 wt% of nanocomposite. It can be concluded that 10 wt% of microcomposite could be mixed to metakaolin for strength development and nanocomposite does not recommend to use as an additive for producing high strength of geopolymer cements.

show abstract

“…One of these may be the composition of the original biomass, including cellulose, hemicellulose, lignin and inorganic matter. Rice husks are known to contain high levels of silica [ 20 ] and so thermogravimetric analysis (in air to 600°C) was performed on a selection of the biomass samples in this study. The data showed that bamboo, sunflower seed husks and peanut shells had a small residual ‘ash’ content of 10%, 11% and 9%, respectively.…”

Section: Resultsmentioning

confidence: 99%

Milling as a route to porous graphitic carbons from biomass

Hunter

Davies

Hérou

et al. 2021

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

This paper reports a simple way to produce porous graphitic carbons from a wide range of lignocellulosic biomass sources, including nut shells, softwood sawdust, seed husks and bamboo. Biomass precursors are milled and sieved to produce fine powders and are then converted to porous graphitic carbons by iron-catalysed graphitization. Graphitizing the raw (unmilled) biomass creates carbons that are diverse in their porosity and adsorption properties. This is due to the inability of the iron catalyst precursor to penetrate the structure of dense biomass material. Milling enables much more efficient impregnation of the biomass and produces carbons with homogeneous properties. Lignocellulosic biomass (particularly waste biomass) is an attractive precursor to technologically important porous graphitic carbons as it is abundant and renewable. This simple method for preparing the biomass enables a wide range of biomass sources to be used to produce carbons with homogeneous properties. This article is part of the theme issue ‘Bio-derived and bioinspired sustainable advanced materials for emerging technologies (part 2)’.

show abstract

Composition and structure of amorphous silica produced from rice husk and straw

Cited by 30 publications

References 6 publications

Dependence of Porosity of Amorphous Silicon Dioxide Prepared from Rice Straw on Plant Variety

Dependence of Porosity of Amorphous Silicon Dioxide Prepared from Rice Straw on Plant Variety

Preparation of low-cost nano and microcomposites from chicken eggshell, nano-silica and rice husk ash and their utilisations as additives for producing geopolymer cements

Milling as a route to porous graphitic carbons from biomass

Contact Info

Product

Resources

About