Characterization of teff straw from selected teff varieties from Ethiopia

Tessema, Belete; Gonfa, Girma; Hailegiorgis, Sintayehu Mekuria; Prabhu, S.

doi:10.1016/j.heliyon.2023.e17422

Cited by 10 publications

(4 citation statements)

References 48 publications

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“…At 1600 cm −1 , a bending vibration caused by H-O-H was seen. The absence of a peak between 1700 and 2800 cm −1 demonstrated that silica was the only organic compound that was produced [24,45]. It implied that there was no NaCl present as well.…”

Section: Analysis Of Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

“…At 795-800 cm −1 , the Si-O bending vibrations produced a strong peak. Si-O vibrations that were bent out of plane had a peak at 445-488 cm −1 [24].…”

Section: Analysis Of Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

“…Therefore, it is an essential to look for a feasible and affordable method to produce silica gel. In this line, as a substitute in this case, preparation of silica gel using leftover biomass, such as rice husk ash [13], sugarcane leaf [14], palm tree [15], rice straw [16], oat husk [17], sugarcane bagasse [14], coffee husk [18], corn cob [19,20], wheat straw [21], maize leaves [22], bamboo leaf [23], and teff straw [24] are gaining more interest because of this approach addresses simple manufacturing procedure and economically affordable , can be a better option.…”

Section: Introductionmentioning

confidence: 99%

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Characteristic investigations on bio-silica gel prepared from teff (Eragrostis tef) straw: effect of calcination time

Tessema,

Gonfa,

Hailegiorgis

et al. 2023

Mater. Res. Express

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Bio-based silica gel is having many commercial significances in various sectors, such as medical, cleansing agents in industries, laboratory analysis, cosmetics, food additives, and so forth. In view of crucial requirements, this study aimed to synthesize and characterize the silica gel from Ethiopia’s primary post-harvest biomass residue, known as teff straw. The present study has been emphasized to investigate on the influence of calcination time for teff straw ash [Joshi et al 2022 Investigation of bamboo leaves as an alternative source of silica: extraction, characterization and its application as an adsorbent for methylene blue sequestration Chem. Select. 7, e202200011] preparation between 2 to 5 h. Further, the specific surface area of the resultant TSA samples was examined for preliminary understandings of processing time. By adopting the standard procedures through template-mediated sol–gel process, acquired TSA samples were subjected to treatment with NaOH to result sodium silicate solution and the amorphous silica. From the findings, it was apparent that the yield of silica gel has significantly influenced by calcination time. Accordingly, the maximum yield (90.0%) was attained at the calcination time of 4 h at 900 °C. Further, physiochemical and morphological characteristics of acquired silica gels were ascertained using sophisticated instrumental techniques such as BET, FTIR, XRD, SEM, and EDX. The XRD analysis of the crystallographic characteristics showed that the silica extracted from TSA at 900 °C for 2, 3, 4, and 5 h was found to be in amorphous state. The surface morphological studies of silica gel samples have been carried out using SEM studied. the EDX spectra showed the negligible amount of other impurities, nevertheless a larger amount of silica was found with highest purity of 99.77% e silica gel was obtained in TSA calcinated at 3 h. FTIR spectrum confirmed the presence of siloxane (Si–O–Si) vibrations of amorphous silica that are responsible for the strong bend observed at 1070 cm−1. It was found that the silica gel prepared at 3 h of calcination time had the largest specific surface area of 739.242 m2 g−1, pore volume of 0.32 cm3 g−1, and a pore diameter of 1.68 nm.

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Section: Analysis Of Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

“…At 795-800 cm −1 , the Si-O bending vibrations produced a strong peak. Si-O vibrations that were bent out of plane had a peak at 445-488 cm −1 [24].…”

Section: Analysis Of Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characteristic investigations on bio-silica gel prepared from teff (Eragrostis tef) straw: effect of calcination time

Tessema,

Gonfa,

Hailegiorgis

et al. 2023

Mater. Res. Express

Self Cite

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“…The spectra of the modified wheat straw surface (MC-T; MH-T//AC-T; AH-T) revealed prominent peaks at approximately 1200, 1060, 795, and 445 cm −1 (Figure 7). Peaks near 1060 cm −1 and 445 cm −1 are attributed to Si-O stretching, indicating the presence of siliconoxygen bonds [16,45]. The peak at 1200 and 795 cm −1 is attributed to the symmetrical stretching vibrations of the Si-O-Si band [46,47].…”

Section: Characterization Of Wheat Strawmentioning

confidence: 99%

Surface-Modified Wheat Straw for the Production of Cement-Free Geopolymer Composite: Effects of Wheat Variety and Pre-Treatment Method

Kalpokaitė-Dičkuvienė,

Pitak,

Sholokhova

et al. 2024

J. Compos. Sci.

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The development of new composite materials with specific properties and reduced environmental pollution can be achieved by the incorporation of agricultural residues, whose morphology is strongly affected by their variety and growing conditions. Herein, the functional properties of a cement-free geopolymer composite reinforced with straw from two wheat varieties (Ada and Malibu) were investigated through different straw pre-treatment methods and their surface modification with silane coupling agents. The characterization of the wheat surface and the geopolymer composites involved SEM-EDS, TGA, FTIR, and gas physisorption analysis methods supplemented with mechanical strength and moisture ingress measurements. Mild (23 °C) and severe (100 °C) physical pre-treatment methods with chemical soaking in 7.3 M isopropanol solution were applied on wheat straw. Tetraethoxysilane (TEOS) with octadecylamine was employed for chemical surface modification. The set of geopolymer compositions was prepared with untreated, pre-treated, and modified straws. The results revealed the hot pre-treatment method caused a higher degradation of siliceous layers of straw, especially in the Ada variety. The modification with TEOS resulted in irregular silane coating formation regardless of the wheat variety and pre-treatment method. Despite good interfacial bonding of the modified straw with the geopolymer matrix, the mechanical strength of the composites was reduced, although the resistance to water ingress slightly increased. Comparing both varieties, Ada wheat showed better performance than Malibu.

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