Synthesis of Chitosan-Polyvinyl Alcohol Biopolymers to Eliminate Fluorides from Water
| Autor: | Rosa Elvira Zavala Arce, María de la Luz Jiménez Núñez, José Luis García-Rivas, Cecilia Judith Valdez-Alegría, Beatriz García-Gaitán, Rosa María Fuentes-Rivas |
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| Rok vydání: | 2020 |
| Předmět: |
lcsh:QR1-502
Infrared spectroscopy 02 engineering and technology 010402 general chemistry 01 natural sciences Biochemistry Polyvinyl alcohol Endothermic process lcsh:Microbiology Article Water Purification Fluorides chemistry.chemical_compound Adsorption Polyphosphates Freundlich equation Point of zero charge fluoride adsorption thermodynamic parameters Fourier transform infrared spectroscopy Molecular Biology Chitosan Epoxy Resins Water 021001 nanoscience & nanotechnology 0104 chemical sciences adsorption isotherm Cross-Linking Reagents Chemical engineering chemistry Polyvinyl Alcohol Thermodynamics 0210 nano-technology Fluoride Water Pollutants Chemical adsorption kinetics |
| Zdroj: | Biomolecules Biomolecules, Vol 10, Iss 1, p 156 (2020) Volume 10 Issue 1 |
| ISSN: | 2218-273X |
| DOI: | 10.3390/biom10010156 |
| Popis: | The fluoride content in groundwater varies depending on geological configuration. Fluoride problems tend to occur in places where these minerals are most abundant in rocks. The objective of the present work was to synthesize four biopolymers based on chitosan-polyvinyl alcohol (Ch-PVA) cross-linked with sodium tripolyphosphate pentabasic (TPP) and ethylene glycol diglycidyl ether (EGDE) and determine their ability to remove fluoride from water. The characterization of the Ch-PVA beads was performed by way of Scanning Electron Microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR). The percentage of humidity and the point of zero charge were determined. The Ch-PVA beads showed a surface area of 63.87 m2 g&minus 1, a pore size of 7.6 nm, a point of zero charge of 7.4, and 98.6% humidity. The kinetic adsorption study was adjusted to the pseudo-second-order model and the adsorption equilibrium data were adjusted to the Freundlich adsorption isotherm, showing a maximum fluoride adsorption capacity of 12.64 mg.g&minus 1 at pH 7 and 30 ° C, for the beads of Ch-PVA-NaOH-TPP. According to the thermodynamic parameters: &minus ∆Go, +∆Ho and &minus ∆So, fluoride adsorption is spontaneous, endothermic in nature and there is no random energy change in the solid/liquid interface during the adsorption process. |
| Databáze: | OpenAIRE |
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