Synthesis and characterization of nanostructured silica powders using rice hull ash-based sodium silicate solution by precipitation and calcination

IF 2.2 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Letters: X Pub Date : 2023-03-01 DOI:10.1016/j.mlblux.2022.100175
Emie Salamangkit Mirasol , Masaru Shimomura
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Abstract

Herein, characteristics of the nanostructured silica powders (NsSP) synthesized from Philippine rice hull ash-based sodium silicate solution by precipitation (pH 2, pH 6) and calcination (600 °C, 900 °C) were presented. Characterizations confirmed that the synthesized NsSP contains high amount of SiO2. NsSP obtained at pH 2 revealed higher mass losses by ∼ 12 % until 900 °C and higher intensities of –OH and Si–OH bonds than obtained at pH 6. Calcination of NsSP at 900 °C removes the Si–OH bond leading to a relative growth in the SiO2 primary particles but SiO2 structure remained amorphous. Morphology of NsSP obtained at pH 2 were cloud-like while NsSP obtained at pH 6 were bead-like and more distinct.

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稻壳灰基水玻璃溶液沉淀法和煅烧法合成纳米二氧化硅粉体及表征
以菲律宾稻壳灰基水玻璃溶液为原料,通过沉淀(pH 2、pH 6)和煅烧(600℃、900℃)制备纳米二氧化硅粉体(NsSP)。表征结果表明,合成的NsSP中SiO2含量较高。在pH 2下得到的NsSP在900°C前的质量损失比在pH 6下得到的高~ 12%,oh和Si-OH键的强度也比在pH 6下得到的高。NsSP在900℃下煅烧去除Si-OH键,导致SiO2初生颗粒相对长大,但SiO2结构仍保持非晶态。pH值为2时获得的NsSP形态呈云状,pH值为6时获得的NsSP形态呈球状,且更明显。
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CiteScore
3.10
自引率
0.00%
发文量
50
审稿时长
114 days
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