The Production of Biogenic Silica from Different South African Agricultural Residues through a Thermo-Chemical Treatment Method
| Autor: | Susan Wassersleben, Samuel A. Iwarere, Dirk Enke, Jonathan Pocock, Ncamisile Nondumiso Maseko, Annegret Stark, Denise Schneider |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Thermogravimetric analysis
020209 energy maize leaves lcsh:TJ807-830 Geography Planning and Development lcsh:Renewable energy sources chemistry.chemical_element 02 engineering and technology Management Monitoring Policy and Law Biogenic silica chemistry.chemical_compound 0202 electrical engineering electronic engineering information engineering sugarcane pith Fiber lcsh:Environmental sciences lcsh:GE1-350 Renewable Energy Sustainability and the Environment Chemistry green chemistry lcsh:Environmental effects of industries and plants Sulfuric acid biogenic amorphous silica sugarcane fiber sugarcane leaves 021001 nanoscience & nanotechnology Nitrogen Amorphous solid lcsh:TD194-195 Elemental analysis ddc:333.7 0210 nano-technology Citric acid Nuclear chemistry |
| Zdroj: | Sustainability Volume 13 Issue 2 Sustainability, Vol 13, Iss 577, p 577 (2021) |
| ISSN: | 2071-1050 |
| DOI: | 10.3390/su13020577 |
| Popis: | A thermo-chemical treatment method was used to produce biogenic amorphous silica from South African sugarcane and maize residues. Different fractions of South African sugarcane (leaves, pith, and fiber) were processed for silica production. The biomass samples were leached with either 7 wt% citric acid or 7 wt% sulfuric acid at 353 K for 2 h prior to being rinsed, dried and combusted using a four-step program ranging from room temperature to 873 K in a furnace. The characterization of the pre-treated biomass samples was conducted using thermogravimetric analysis (TG/DTA), X-ray fluorescence analysis (XRF) and elemental analysis (CHN), while the final products were characterized by XRF, X-ray diffraction (XRD), elemental analysis, nitrogen physisorption and scanning electron microscopy (SEM). Citric acid pre-treatment proved to be an attractive alternative to mineral acids. Amorphous biogenic silica was produced from sugarcane leaves in good quality (0.1 wt% residual carbon and up to 99.3 wt% silica content). The produced biogenic silica also had great textural properties such as a surface area of up to 323 m2 g&minus 1, average pore diameter of 5.0 nm, and a pore volume of 0.41 cm3 g&minus 1. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|