Back to Search
Start Over
Fluoride ion adsorption isotherms, kinetics, and thermodynamics on iron(III) oxyhydroxide powders containing cellulose nanofibrils.
- Source :
- Environmental Science & Pollution Research; Apr2023, Vol. 30 Issue 16, p48201-48210, 10p
- Publication Year :
- 2023
-
Abstract
- The adsorption isotherms, kinetics, and thermodynamics of fluoride ions (F<superscript>−</superscript>) on FeOOH powders in water were investigated to obtain fundamental information on FeOOH powders, which are used as F<superscript>−</superscript> adsorbents in drinking and industrial water, and industrial wastewater. FeOOH powders were prepared as precipitates by mixing aqueous FeCl<subscript>3</subscript> and NaOH solutions (1:3 mol/mol) in the presence of 2,2,6,6,-tetramethylpiperidine-1-oxyl radical (TEMPO)-oxidized cellulose nanofibrils (TOCNs), carboxymethylcellulose (CMC), or TEMPO-oxidized cellulose (TOC) fibers (without nanofibrillation), and subsequent drying and pulverizing. The FeOOH:TOCN, FeOOH:CMC, and FeOOH:TOC dry mass ratios were controlled at 87:13. The amount of F<superscript>−</superscript> adsorbed by the FeOOH/TOCN powder per FeOOH mass was higher than those adsorbed by FeOOH, FeOOH/CMC, or FeOOH/TOC. The F<superscript>−</superscript> adsorption isotherms on the FeOOH-containing powders showed higher correlation coefficients with the Langmuir model than with the Freundlich model. This indicates that F<superscript>−</superscript> adsorbed on FeOOH initially formed a monolayer, predominantly via physical adsorption. Pseudo-second-order kinetics fitted well to the time-dependent F<superscript>−</superscript> adsorption behaviors on the FeOOH-containing powders. Thermodynamic analysis of F<superscript>−</superscript> adsorption on the FeOOH-containing powders showed that the ΔG values were negative, which indicates that F<superscript>−</superscript> adsorption on the FeOOH-containing powders proceeded spontaneously in water. The negative ΔG value for FeOOH/TOCN was higher than those for FeOOH, FeOOH/CMC, and FeOOH/TOC at the same temperature. This shows that the FeOOH/TOCN powder can be used as an excellent and efficient F<superscript>−</superscript> adsorbent in water. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09441344
- Volume :
- 30
- Issue :
- 16
- Database :
- Complementary Index
- Journal :
- Environmental Science & Pollution Research
- Publication Type :
- Academic Journal
- Accession number :
- 163045443
- Full Text :
- https://doi.org/10.1007/s11356-023-25679-1