Polymeric hydrogels for the removal of fluoride ions from natural water and its toxicity
Year: 2024
Type: article
Abstract: In the present work hydrogels synthetized from polyvinyl alcohol and polyvinyl pyrrolidone (UH) and modified with FeCl 3 (MH) were used to remove fluoride ions from natural water in batch and column systems. The natural water used for this work contained 5 mg/L of F - ions, the maximum permissible limit established by current Mexican regulations is 1.50 mg/L. According to results, the adsorption capacity of the modified hydrogel was higher (MH: 0.342 mg/g) than the unmodified (UH: 0.277 mg/g), based in its application on natural water treatment this value is acceptable; the equilibrium time for MH was 720 min. Three models for each system type (batch and column) were applied, the kinetic data were best fitted to the Ho-McKay model (R 2 = 0.993) for batch test and the Clark model for MH in column experiment. The adsorption process was carried out by ionic exchange between the OH - groups of the adsorbent and the F - ions. The results of toxicity indices obtained from the bioassay on the seeds reported data in moderate toxicity interval (-2.5 to −0.5) for lettuce and low toxicity (0 to −2.5) for radish with respect to minimum concentrations of F - . In general, data showed that UH and MH are promising adsorbent materials to remove F - from natural water and are considered environmentally friendly since they were synthesized with biocompatible materials such as PVA and biodegradable materials such as PVP and citric acid.
Source: Desalination and Water Treatment
Authors: V. Rosendo-González, E. Gutiérrez-Segura, M. Solache-Rios, A. Amaya-Chavez
Language: English
Topic: Fluoride Effects and Removal
Subfield: Water Science and Technology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,000
OpenAlex ID: W4405893488