Remediation of Fluoride Laden Water by Sorption using Kenyan Kisii Soapstone and Calcium Bentonite
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Date
2023
Authors
Omolo, Ted David
Wanjau, Ruth
Mbui, Damaris
Gerald, Mbugua
Journal Title
Journal ISSN
Volume Title
Publisher
IOSR-JAC
Abstract
Background: The aim of this study was to evaluate the adsorption potential of natural and locally available
soapstone and Calcium bentonite clay for fluoride removal from aqueous solution and to determine the optimum
conditions for use. Adsorption potential was anchored on the availability of hydroxyl and aluminum ions
inherent in both minerals which have been established to have ability for fluoride adsorption in aqueous
solutions. Adsorption potential was investigated using batch equilibrium experiments.
Materials and Methods; Mineralogical characterizations were done using X-ray fluorescencespectroscopy.
Fluoride ion selective electrode was used in determination of fluoride content in aqueous solution.Optimization
studiesoninitial pH of the solution, contact time, initial fluoride concentration, adsorbent dose, and heat
pretreatment of the adsorbent were done in batch adsorption experimentsat room temperature.
Results:It was observed that calcium bentonite exhibited better adsorption capacity of 0.21mg/g while
soapstone had 0.08mg/g at a contact time of 45 min and 5 min respectively.The optimum pH for both adsorbents
was established at 3.6. The experimental data for bentonite fitted well with Langmuir isotherm indicating a
monolayer adsorption while for Soapstone fitted better into Freundlich adsorption, indicating multilayer
adsorption with heterogeneous energetic distribution of active sites.
Conclusion:Based on these findings, the two adsorbents can be fitted into household defluoridation apparatus
for domestic remediation of fluoride contaminated water.
Description
Article
Keywords
Adsorption, adsorbent, defluoridation, fluorides, soapstone, bentonite, clay
Citation
Omolo, T. D., Wanjau, R., Mbui, D., & Gerald, M. Remediation of Fluoride LadenWater by Sorption usingKenyan Kisii Soapstone and Calcium Bentonite.