Nanosilicon powder extraction as a sustainable source (from Iraqi rice husks) by hydrothermal process

Zedin, Naser Korde; Ajeel, Sami A.; Sukkar, Khalid A.

doi:10.1063/5.0000147

Cited by 7 publications

(4 citation statements)

References 19 publications

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“…respectively. This result is an agreement with researches [14][15][16]. The relationship between the degree of purity for extraction SiO 2 NPs and NaOH concentration is show in Fig.…”

Section: Xrf Analysissupporting

confidence: 91%

Extraction High Purity Nanosilica Corn Cob by Modified Precipitation Technique

Ajeel

Sukkar

Zedin

2021

Preprint

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Corn cob considers the agricultural waste in Iraq. High purity SiO2NPs were extracted from corn cob by enhanced precipitation and developed leaching processes. In this study, pre-treatment with 3N HCl has achieved then calcination of the corn cob at 700°C, then follows with the leaching process with (2, 2.5, 3)N NaOH. The characterizations of the prepared SiO2NPs were analyzed with atomic force microscopy (AFM), and X-ray fluorescence (XRF). The results were found that the prepared SiO2NPs have an amorphous structure with a high purity of 97.13 %. Also, the AFM results indicated that the average diameter of the SiO2NPs was 85 nm. It was noted that the leaching processes and pretreatment methods determine the structure, particle size, and quality of the synthesized SiO2NPs.

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“…respectively. This result is an agreement with researches [14][15][16]. The relationship between the degree of purity for extraction SiO 2 NPs and NaOH concentration is show in Fig.…”

Section: Xrf Analysissupporting

confidence: 91%

Extraction High Purity Nanosilica Corn Cob by Modified Precipitation Technique

Ajeel

Sukkar

Zedin

2021

Preprint

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“…Purity for the prepared silica from rice husk was measured by X-ray fluorescence (XRF). Table II illustrates the chemical analysis of prepared nano-silica which was prepared at 700 o C, it is noteworthy that the choice of the temperature of the calcination at 700 o C was dependent on the previous studies of research [8,11]. Therefore, it concluded that calcination at a temperature above 700 o C gives crystal silica.…”

Section: Xrf Resultsmentioning

confidence: 95%

“…Comparing with crystalline silica, amorphous silica has interesting properties. In many chemical applications as absorbents, catalysts, and thermal insulators, amorphous silica has a high interest because of its proprieties like small particle size with high specific surface area [7][8][9]. Various synthetic methods of extracting nano-silica from RHA were used like chemical precipitation, ion exchange, solvent extraction, and electrolysis deposition method.…”

Section: Introductionmentioning

confidence: 99%

Chemical Extraction Process for Producing High Purity Nanosilica from Iraqi Rice Husk

Ajeel¹,

Sukkar²,

Zedin³

2021

ETJ

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Rice husk is considered a main agricultural waste in Iraq. High purity SiO2 NPs were produced from rice husk by enhanced precipitation and developed leaching processes for the preparation of silica from RH. In this study, pre-treatment for rice husk was with 3N HCl, and calcination at 700°C was achieved, then followed with a leaching process with (1.5, 2, 2.5, 3) N NaOH concentrations. The characterizations of the prepared SiO2 NPs were studied by X-ray fluorescence (XRF), X-ray diffraction (XRD), and atomic force microscopy (AFM). The results show that the prepared SiO2 NPs have an amorphous structure with a high purity of 99.75%. The results of the X-Ray confirm the amorphous nature of the extracted SiO2 NPs. Also, the AFM results indicated that the average diameter of the SiO2 NPs was 85 nm. It was noted that the leaching processes and pretreatment methods determine the structure, particle size, and quality of the synthesized SiO2 NPs.

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“…Generally, concrete undergoes some operating problems in terms of workability and flow characteristics [16][17][18][19][20]. However, the addition of fly ash or silica and mineral materials can enhance the workability and flow specifications of a concrete mixture.…”

Section: Introductionmentioning

confidence: 99%

Development and Performance Evaluation of UHPC and HPC Using Eco-Friendly Additions as Substitute Cementitious Materials with Low Cost

2023

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Ultra-high-performance concrete (UHPC) and high-performance concrete (HPC) are widely used in construction engineering applications. The quality and economy of this type of concrete are the main challenges in real construction systems due to their expensive cost. In the present investigation, the performances of UHPC and HPC were improved using eco-friendly additives from natural sources or industrial wastes. Accordingly, different kinds of concrete mixtures were prepared with the addition of various eco-friendly materials, such as metakaolin (10, 15, and 20%), silica fume (2.5, 5, 10, and 15%), cement kiln dust (CKD) (0, 5, and 10%), and 1 vol.% of steel and polypropylene fibers. All of these materials were subjected to efficient treatment and purification processes. The results indicated that the prepared UHPC was characterized by high compression and flexural strengths. The prepared UHPC (sample CR-2) with metakaolin (10%), CKD (10%), and 1 vol.% of steel fibers provided the highest compressive strength of 135 MPa at 28 days. Moreover, the results showed that reducing the cement amounts to 750, 500, and 250 kg/m3 provided concrete with efficient structural requirements and specifications and can be characterized as UHPC and HPC. Also, the mixture (sample CM15) with a metakaolin addition of 15%, CKD of 100 kg/m3, and 1 vol.% of steel fibers showed the highest flexural strength of 19.14 MPa at 28 d. Moreover, the highest splitting tensile strength of the prepared UHPC cylinders was 9.6 MPa at 28 d for the MSS1000 sample, which consisted of 15% metakaolin, a cement content of 1000 kg/m3, silica fume of 10%, and steel fibers of 1% vol. The prepared UHPC mixtures will reduce the amount of consumed cement and the production cost, with a high performance in comparison to classical concrete. Finally, it was clear that the prepared UHPC and HPC concrete with green additions can serve efficiently in specific construction applications, with high performance, economic feasibility, and safe environmental impacts.

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Nanosilicon powder extraction as a sustainable source (from Iraqi rice husks) by hydrothermal process

Cited by 7 publications

References 19 publications

Extraction High Purity Nanosilica Corn Cob by Modified Precipitation Technique

Extraction High Purity Nanosilica Corn Cob by Modified Precipitation Technique

Chemical Extraction Process for Producing High Purity Nanosilica from Iraqi Rice Husk

Development and Performance Evaluation of UHPC and HPC Using Eco-Friendly Additions as Substitute Cementitious Materials with Low Cost

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