Kumar, Eua Bhatnagar, Amit Ji, Minkyu Jung, Woosik Lee, Sang-Hun Kim, Sun-Joon Lee, Giehyeon Song, Hocheol Choi, Jae-Young Yang, Jung-Seok Jeon, Byong-Hun 2024-01-20T22:02:02Z 2024-01-20T22:02:02Z 2021-09-03 2009-02 0043-1354 https://pubs.kist.re.kr/handle/201004/132769 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 2S degrees 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. (C) 2008 Elsevier Ltd. All rights reserved. English PERGAMON-ELSEVIER SCIENCE LTD FLUORIDE IONS PHYSICOCHEMICAL CHARACTERIZATION PHOSPHATE ADSORPTION WATER-TREATMENT CHEMICAL-MODEL REMOVAL KINETICS DIFFUSION GOETHITE ALUMINUM Defluoridation from aqueous solutions by granular ferric hydroxide (GFH) Article 10.1016/j.watres.2008.10.031 1 WATER RESEARCH, v.43, no.2, pp.490 - 498 WATER RESEARCH 43 2 490 498 scie scopus 000263595500026 2-s2.0-58549089945 Engineering, Environmental Environmental Sciences Water Resources Engineering Environmental Sciences & Ecology Water Resources Article FLUORIDE IONS PHYSICOCHEMICAL CHARACTERIZATION PHOSPHATE ADSORPTION WATER-TREATMENT CHEMICAL-MODEL REMOVAL KINETICS DIFFUSION GOETHITE ALUMINUM Defluoridation Granular ferric hydroxide (GFH) Adsorption isotherms Kinetic modeling pH Temperature effect Competing anions