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Use of Al2O3-Areca nut activated carbon composite as an adsorbent for defluoridation of water

Author Affiliations

  • 1Department of Engineering Science and Humanities, Institute of Engineering, Pulchowk Campus, Tribhuvan University, Nepal

Res.J.chem.sci., Volume 8, Issue (9), Pages 1-6, September,18 (2018)


The concentration of fluoride in drinking water above 1.5 mg/L can cause adverse health effects. The present study deals with defluoridation (fluoride removal) of water using Al2O3-Areca nut activated carbon composite as an adsorbent. Activated carbon (AC) was prepared from Areca nut using H3PO4 as an activating agent at 400°C under N2 atmosphere. The Al2O3-Areca nut AC composite (composite adsorbent) was prepared with the resultant AC and Al2O3. The effects of pH, adsorbent dosage and contact time on the percentage of fluoride removal were studied by batch mode. The percentage of fluoride removal by the composite adsorbent (~80) was much higher as compared to the plain AC (~40%). The highest percentage of fluoride removal was found at pH 2, adsorbent dose of 20gm/L and contact time of 180min. The adsorption data were fitted more to Langmuir isotherm than Freundlich isotherm. It describes a monolayer adsorption of the fluoride on a uniform composite adsorbent surface. The maximum adsorption capacity of the composite adsorbent for fluoride removal was 7.6 mg/gm. As such, it can be concluded that, Al2O3-Areca nut AC composite shows best performance for defluoridation and can be applied in water treatment.


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