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Síntesis y modificación superficial de arcillas para su aplicación como fertilizante de liberación controlada
| Content Provider | Semantic Scholar |
|---|---|
| Author | Vega, Juan Lebrija |
| Copyright Year | 2019 |
| Abstract | Chemical fertilizers are the single most important contributor to enhance the world agricultural productivity. However, the low efficiency of these products causes serious environmental problems. Slow release fertilizers have been proposed as solution to mitigate negative effects. Functionalization of clays is proposed as the aim of the project in order to synthesize slow release fertilizers, both cationic and anionic type. The studied clays are inorganic matrices with a layered structure and with cation-exchange capacity (CEC), which have demonstrated a unique selectivity in the adsorption and desorption of nutrients and pollutants in plants, as Mn and NO3 . This project has been divided in two parts. In the first part, functionalization of 4 clays with the inorganic cation Mn has been carried out : two high-charge micas (Mica-2 and Mica-4), and two smectites, one obtained from natural sources (Wyoming montmorillonite) and other synthetic (laponite). It has been observed that the cation-exchange has been yielded in three of the four samples, not for Mica-4. In the second part, functionalization of laponite and montmorillonite with the organic cation CTA have been performed. In this part, the cation-exchange yielded correctly. Also it has been observed that a big amount of organic was added to the clay layers due to their high specific surface, bringing up a excess of charge which would let anions incorporate in the surface layer. The clays functionalized with Mn are introduced as cationic fertilizer while the clays functionalized with CTA are introduced as the base to the later synthesis of anionic fertilizers. For the study of the samples, the following experimental techniques have been used: thermogravimety, differential scanning calorimetry and mass spectrometry, X ray difraction, Raman spectroscopy and adsorption isotherms. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://repositorio.unican.es/xmlui/bitstream/handle/10902/16909/TFGJuanLebrija.pdf?isAllowed=y&sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
