Defluoridation from aqueous solutions by granular ferric hydroxide (GFH)

Eva Kumar, Amit Bhatnagar, Minkyu Ji, Woosik Jung, Sang Hun Lee, Sun Joon Kim, Giehyeon Lee, Hocheol Song, Jae Young Choi, Jung Seok Yang, Byong Hun Jeon

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266 Citations (Scopus)


This research was undertaken to evaluate the feasibility of granular ferric hydroxide (GFH) for fluoride removal from aqueous solutions. Batch experiments were performed to study the influence of various experimental parameters such as contact time (1 min-24 h), initial fluoride concentration (1-100 mg L-1), temperature (10 and 25 °C), pH (3-12) and the presence of competing anions on the adsorption of fluoride on GFH. Kinetic data revealed that the uptake rate of fluoride was rapid in the beginning and 95% adsorption was completed within 10 min and equilibrium was achieved within 60 min. The sorption process was well explained with pseudo-first-order and pore diffusion models. The maximum adsorption capacity of GFH for fluoride removal was 7.0 mg g-1. The adsorption was found to be an endothermic process and data conform to Langmuir model. The optimum fluoride removal was observed between pH ranges of 4-8. The fluoride adsorption was decreased in the presence of phosphate followed by carbonate and sulphate. Results from this study demonstrated potential utility of GFH that could be developed into a viable technology for fluoride removal from drinking water.

Original languageEnglish
Pages (from-to)490-498
Number of pages9
JournalWater Research
Issue number2
Publication statusPublished - 2009 Feb

Bibliographical note

Funding Information:
Authors are grateful to 21st Frontier research project (Sustainable Water Resources Research Center 3-4-3) and Brain Korea-21 (BK-21) program of Ministry of Education for financial support. We also wish to thank the anonymous reviewers whose willingness to share their expertise has been of enormous benefit.

All Science Journal Classification (ASJC) codes

  • Ecological Modelling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution


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