Adsorption of Fluoride from Water by Use of Powdered Tilapia Fish Scales

R. Nasiebanda, E. Wamalwa, K. Lusweti


Ingestion of adequate fluoride (F-) necessary for healthy bones and teeth is realized through food, soil and water while its excess leads to dental, skeletal and soft tissue damage. Defluoridation is one of the conventional techniques used to protect against fluorosis. In the present study fluoride adsorption from water was done using fish scales collected from Eldoret. These materials were washed, dried, ground, weighed, treated and tested for fluoride removal in water and characterized by FTIR and SEM methods. The effect of F- concentration, adsorbent dosage, contact time, temperature, and pH and agitation rate were also investigated. The results show that the % adsorption of F- on to the powdered fish scales increased from 95% to 99% with corresponding adsorbent mass of 0.5 g/mL and 3 g/mL and a further increase in mass resulted in a constant % adsorption. Additionally, % removal of F- initially increased from 96.7% and attained the highest % adsoption of 98.4 after 1 hour. Furthermore, % adsorption increased from 94.7 with agitation rate of 35 rpm to an optimum agitation rate of 400 rpm with % adsorption of 96. Moreover, fluoride adsorption increased from 94.1% to 96% with increased solution pH of 1 to 7 and then dropped beyond pH 9. Percentage adsorption increased from 95.5-96.4 between a temperature range of 288-313 K, and decreased there after between temperature of 323-353 K. The F- removal increased from 82.6% to 99% between the initial fluoride concentration of 1-10 mg/L, after which the % adsorption remained constant. However, the F- adsorption data correlated to the Freundlich and Langmuir models and could be classified as C-Type according to Giles classification of isotherms. The pseudo-first and pseudo-second order kinetic models and the Weber and Morris intra particle diffusion model equation were applied onto the adsorbent. The adsorbent could be used as a low-cost adsorbent for adsorption of F- ions from aqueous media.


Deflouridation, Adsorption

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Adhikari, S. K., Tipnis, U. K., Harkare, W. P. and Govindan, K. P. (1989). Defluoridation during desalination of brackish water by electrodialysis. Desalination, 71:301–312.

Ahamad, K. U., Mahanta, A. and Ahmed, S. (2019). Removal of fluoride from groundwater by adsorption onto brick powder–alum–calcium-infused adsorbent. Adv Waste Manag, 10(1007):978-981.

Alfredo, K. A., Lawler, D. F. and Katz, L. E. (2014). Fluoride contamination in the Bongo District of Ghana, West Africa: geogenic contamination and cultural complexities. Water Int ,39: 486–503.

Alhussein, A. M., Ismail, Z., Che, N. A. J., Mustafa, M., Alsailawi, H. A., Abbas, A. and Fouad, W. M. (2019). Preparation of Fish Scales Hydroxyapatite (FsHAp) for Potential Use as Fillers in Polymer. J. Chem. Chem. Eng, 13:97-104.

Gikunju, J. K., Mbaria, J. M., Murcithi, W., Kyule, M. N., McDermott, J. J. and Maitho, T. E. (1995). Water fluoride in the Molo Division of Nakuru District, Kenya. Research Report 28 1 (1): 17-20.

Goswami, A. and Purkait, M. K. (2012). The defluoridation of water by acidic alumina. Chemical Engineering Research and Design, 90 (12): 2316–2324.

Hanafiah, M., Zakaria, H. and Wan N. W. S. (2009). Preparation, characterization, and adsorption behavior of Cu (II) ions on to alkali-treated weed (Imperata cylindrica) leaf powder. Water Air Soil Pollut, 201(1–4):43–53.

Hinz, C. (2001). Description of sorption data with isotherm equations. Geoderma, 99 (2001): 225–243.

Hugo, A. S., Raúl, C. and Ruth, A. (2013). Fluoride Removal from Aqueous Solutions by Mechanically Modified Guava Seeds. International Journal of Sciences: Basic and Applied Research (IJSBAR) 11 (1): 159-172.

Kavita, P., Sarita, S., Ashok, S. and Sanjay, V. (2016). Defluoridation of contaminated water by using low cost adsorbents: A review. International Journal of Advanced Science and Research 1 (6): 28-32.

Keerthi, B. G. (2015). Adsorption on fluoride removal by using batch techniques. Proceeding of NCRIET-2015 & Indian J.Sci.Res. 12(1): 209-213.

Kefyalew, G., Feleke, Z., Bernd, H. and Negussie, M. (2012). Fluoride removal by adsorption on thermally treated lateritic soils. Chemical Society of Ethiopia 26 (3): 361-372.

Kumar, P. S., Suganya, S., Srinivas, S., Priyadharshini, S. and Karthika, M. (2019). Treatment of fluoride contaminated water. A review. Environmental Chemistry Letters, Springer Verlag, 17 (4): 1707 - 1726.

Mohapatra, M., Rout, K. and Singh, P. (2011). Fluoride adsorption studies on mixed-phase nano iron oxides prepared by surfactant mediation-precipitation technique. Journal of Hazardous Materials, 186 (2-3): 1751–1757.

Mondal, N. K., Bhaumik, R. and Datta, J. K. (2015). Removal of fluoride by aluminum impregnated coconut fiber from synthetic fluoride solution and natural water. Alexandria Engineering Journal, 54 (4): 1273–1284.

Mourabet, M., El Rhilassi, A., El Boujaady, H., Bennani-Ziatni, M. and Taitai, A. (2017). Use of response surface methodology for optimization of fluoride adsorption in an aqueous solution by Brushite. Arabian Journal of Chemistry, 10: S3292–S3302.

Piddennavar, R. and Krishnappa, P. (2013). Review on Defluoridation Techniques of Water.The International Journal of Engineering and Science, 2 (3):86-94.

Puthenveedu, S., Pillai, H., Chonattu, J. and Tharayil, M. (2012). Defluoridation of water using biosorbents. Natural science, 4 (4): 245-251.

Singh, G., Kumari, B., Sinam, G., Kriti, K. N. and Mallick, S. (2018). Fluoride distribution and contamination in the water, soil and plants continuum and its remedial technologies, an Indian perspective a review. Environ Pollut 239:95–108.

Sujana, M. G., Pradhan, H. K. and Anand, S. (2009). Studies on sorption of some geomaterials for fluoride removal from aqueous solutions. 1. Hazard. Mater, 161: 120-5.

Tej, P. S. and Majumder, C. B. (2016). Comparing fluoride removal kinetics of adsorption process from aqueous solution by biosorbents. Department of Chemical Engineering, IIT Roorkee, Roorkee 247: 667, Uttarakhand, India.

Uddin, M. T., Islam, M. S. and Abedin, M. Z. (2007). Adsorption of phenol from aqueous solution by water hyacinth ash. ARPN Journal of Engineering and Applied Sciences, 2:2.

Waheed, S., Attar, S. and Waghmare, M. (2009). Investigation on sorption of fluoride in water using rice husk as an adsorbent. Nature Environment and Pollution technology, 8: 217-223.

Wambu, E. W. (2015). Fluoride levels in water sources of Gilgil area in Kenya. Deflouridation using locally available geomaterials, PhD. Thesis, Kenyatta University.

Xu, L., Chen, G. and Peng, C. (2017). Adsorptive removal of fluoride from drinking water using porous starch loaded with common metal ions. Carbohydrate Polymers,160:82–89.

Yakout, S. M. and Elsherif, E. (2010). Batch kinetics, isotherm and thermodynamic studies of adsorption of strontium from aqueous solutions onto low cost rice-straw based carbons. Carbon Science and Technology 1 (2010): 144 – 153.


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