Synthesis, Extraction and Optimization of Silica Production from Teff straw (Eragrostis tef)
| dc.contributor.advisor | Shegaw, Ahmed (PhD) | |
| dc.contributor.author | Feven, Hagereselam | |
| dc.date.accessioned | 2020-03-07T09:03:17Z | |
| dc.date.accessioned | 2023-11-10T14:54:32Z | |
| dc.date.available | 2020-03-07T09:03:17Z | |
| dc.date.available | 2023-11-10T14:54:32Z | |
| dc.date.issued | 2019-06 | |
| dc.description.abstract | Silica is one of the important chemicals widely used in manufacturing sectors for different applications. Some of the applications of silica are in detergents and cleaners as extenders, in rubber and tire as fillers, in shoe sols, Ink-receptive Coatings, adsorptive, adhesive and others. As the commercial silica is produced from non-renewable, and there are some ongoing issues with health hazard due to the crystalline structure of the raw material which is quartz and high emission of carbon dioxide and waste water, the purpose of this research was to develop biobased silica using teff straw as a renewable feed stock. This study reports preparation of silica from teff straw ash by sol-gel method. The process of bio-silica production includes leaching of teff straw with 2.5N of HCl acid. The treated teff straw was decomposed thermally at ashing temperature 700°C for 2 hours. Before proceeding to the extraction of silica using alkali solution the silica percentage in the ash was analyzed using AAS spectrometer. The ash was treated with NaOH solution at different concentration (0.5M, 1.5M and 2.5M), different extraction time (60min, 90min and 120 min) and various extraction temperatures (75 C) prior to acidification in order to extract silica in the form of sodium silicate solution (SSS). Design Expert® version11.1.0.1 with Box-Behenken was applied to investigate the effect of experimental variables. Significance of the process variables were analyzed by ANOVA. The optimum parameters for the extraction of amorphous silica were 1.79M of NaOH, 109.99 minutes and 84.17 0 0 0 C, 85 C and95 0 C with maximum yield of 83.23%. Physicochemical properties of extracted silica were determined by performing XRD and FTIR analysis. The teff straw ash contains about 92% silica. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/20983 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Silica Production | en_US |
| dc.subject | Teff straw | en_US |
| dc.subject | Eragrostis tef | en_US |
| dc.subject | Synthesis | en_US |
| dc.subject | Optimization | en_US |
| dc.title | Synthesis, Extraction and Optimization of Silica Production from Teff straw (Eragrostis tef) | en_US |
| dc.type | Thesis | en_US |