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Fluoride removal from aqueous solution by municipal solid waste compost ash: kinetics, and isotherms studies.
- Source :
- International Journal of Environmental Analytical Chemistry; Nov2022, Vol. 102 Issue 13, p2937-2949, 13p
- Publication Year :
- 2022
-
Abstract
- Fluoride (F<superscript>–</superscript>) is one of the common water pollutants, which causes severe diseases if be present over 1.5 mg/L suggested by WHO for drinking water. There is essential to find a simple and cost-effective method for excess F<superscript>–</superscript> removal from contaminated water. In this study, municipal solid waste compost ash (MSWCA) was used to remove F<superscript>–</superscript> from aqueous solution. The effect of operational variables such as adsorbent calcination temperature (550–900°C), adsorbent dose (0.25–1.5 g/L), pH (2–12), occurrence of competing anions (HCO<subscript>3</subscript><superscript>−</superscript>, CO<subscript>3</subscript><superscript>2−</superscript>, Cl<superscript>−</superscript>, NO<subscript>3</subscript><superscript>−</superscript> and SO<subscript>4</subscript><superscript>2−</superscript>), adsorption temperature (20–50°C) and mixing time (15–120 min) were investigated. F<superscript>–</superscript>adsorption was highest when compost ash calcinated at 550°C. F<superscript>–</superscript> removal increased from 42.6 to 87.7% by increasing adsorbent dose from 0.25 to 1.5 g/L. The removal also increased 4.4% when the temperature of solutions increased from 20 to 50°C, an indicative of endothermic process. Furthermore, adsorption increased by increasing pH from 4 to 10 and then decreased with pH up to 12. F<superscript>−</superscript> removal reduced about 10% in the presence of SO<subscript>4</subscript><superscript>2−</superscript>. Based on pseudo- second-order kinetic model, it was found that the process was controlled by chemisorption. The equilibrium data were well fitted with Langmuir model, which implied the F<superscript>−</superscript>ions doesn't interact and adsorbed in monolayer onto MSWA. The Langmuir maximum adsorption capacity was 30.56 mg F/g MSWCA. Due to excellent adsorptive properties, MSWCA presents as a promising material for F<superscript>−</superscript> adsorption from wastewaters or landfill leachates. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03067319
- Volume :
- 102
- Issue :
- 13
- Database :
- Complementary Index
- Journal :
- International Journal of Environmental Analytical Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 159023048
- Full Text :
- https://doi.org/10.1080/03067319.2020.1761349