Development of Kaolin Clay as a Cost-Effective Technology for Defluoridation of Groundwater
Open Access
- 3 October 2020
- journal article
- research article
- Published by Hindawi Limited in International Journal of Chemical Engineering
- Vol. 2020, 1-10
- https://doi.org/10.1155/2020/8820727
Abstract
Excessive fluoride in potable groundwater is a serious health problem in rural areas of many developing countries. The presence of a small amount of fluoride in potable water is beneficial to human health, but a high amount (>1.5mg/L) has adverse effects. The present study is aimed to prepare a new cost-effective adsorbent of kaolin clay that can be used as a valuable defluoridating agent. Characterization of the prepared adsorbent was carried out using DSC, FTIR, TGA, and XRD. Also, the surface area of the adsorbent was measured by BET analysis. The clay was activated with concentrated H2SO4, and the effects of various experimental parameters such as temperature (25, 40, 50, and 60°C), pH (2, 4, 6, and 8), particle size (2/g and 5.258m2/g, respectively. The optimum fluoride removal by both adsorbents was obtained at pH 4, temperature 50°C, particle size 0.075mm, and 60min. In both adsorbents, the degree of fluoride removal was increased with a decrease in the particle size of the adsorbent and increased contact time and dosage of the adsorbent. In all parameters, adsorption by activated clay was better than raw kaolin clay for retaining fluoride. The obtained data were well fitted with Freundlich and Langmuir isotherm models.Keywords
Funding Information
- Bahir Dar Institute of Technology
This publication has 40 references indexed in Scilit:
- Electrodialytic removal of fluoride from water: Effects of process parameters and accompanying anionsSeparation and Purification Technology, 2008
- Breakthrough Analysis for Water Defluoridation Using Surface-Tailored Zeolite in a Fixed Bed ColumnIndustrial & Engineering Chemistry Research, 2008
- Cost Effective Natural Adsorbent for Fluoride RemovalAdvanced Materials Research, 2008
- Enhanced fluoride sorption by mechanochemically activated kaolinitesJournal of Hazardous Materials, 2008
- Removal of excess fluoride from water using waste residue from alum manufacturing processJournal of Hazardous Materials, 2007
- Equilibrium and Kinetic Studies for Fluoride Adsorption from Water on Zirconium Impregnated Coconut Shell CarbonSeparation Science and Technology, 2007
- Fluoride in drinking water and its removalJournal of Hazardous Materials, 2006
- Drinking water quality in the Ethiopian section of the East African Rift Valley I—data and health aspectsScience of The Total Environment, 2003
- Removal of fluoride from aqueous solution by using red mudSeparation and Purification Technology, 2002
- A Limestone Reactor for Fluoride Removal from WastewatersEnvironmental Science & Technology, 2000