XRD-Rietveld analysis as a tool for monitoring struvite analog precipitation from wastewater: P, Mg, N and K recovery for fertilizer production
| Autor: | Simone Patrícia Aranha da Paz, José Augusto Martins Corrêa, Rose Caldas de Souza Meira |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
lcsh:TN1-997
Materials science Struvite X-ray diffraction – XRD chemistry.chemical_element 02 engineering and technology 01 natural sciences Biomaterials chemistry.chemical_compound 0103 physical sciences lcsh:Mining engineering. Metallurgy 010302 applied physics Precipitation (chemistry) Rietveld refinement Magnesium Phosphorus Metals and Alloys 021001 nanoscience & nanotechnology Nitrogen Surfaces Coatings and Films chemistry Wastewater Struvite analog Ceramics and Composites 0210 nano-technology Stoichiometry Nuclear chemistry |
| Zdroj: | Journal of Materials Research and Technology, Vol 9, Iss 6, Pp 15202-15213 (2020) |
| ISSN: | 2238-7854 |
| DOI: | 10.1016/j.jmrt.2020.10.082 |
| Popis: | The objective of this study was to select between four proposed synthesis conditions, which one would be the most propitious for struvite precipitation from wastewater and, on such product, detail its crystallochemical aspects using the Rietveld refinement method to determine the chemical formula and chemistry analyses by Wavelength Dispersive X-ray Fluorescence (WDXRF) for validation. The struvite synthesis was investigated for pH 10 and 12 and phosphorus concentrations of 100 and 300 mg/L under the same room temperature (RT) condition and a magnesium to phosphorus to nitrogen (Mg: P: N) molar ratio of 1: 1: 2. Struvite was successfully obtained under a moderately alkaline pH (10). No struvite precipitation occurred under the same temperature and Mg: P: N molar ratio for a highly alkaline pH (12). Under RT condition, 300 mg/L P, a Mg: P: N molar ratio of 1: 1: 2, and a pH of 10, a product with two struvite phases was obtained: an 75% struvite analog ([K0.34(NH4)0.66]MgPO4.6H2O) and 25% struvite (NH4MgPO4.6H2O). Last, the Rietveld tool is useful for monitoring struvite production from wastewaters, since the chemical ratio (stoichiometry of the phase) is what will define its classification in: struvite, struvite analog, K-struvite or mixed. In addition, it will help in the classification of the fertilizer product (chemical content of nutrients). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|