Synthesis and performance evaluation of AI/Fe oxide coated diatomaceous in groundwater defluoridation : towards fluoris mitigation

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dc.contributor.author Izuagie, Anthony A.
dc.contributor.author Gitari, Wilson M.
dc.contributor.author Gumbo, Jabulani R.
dc.date.accessioned 2016-08-19T10:37:37Z
dc.date.available 2016-08-19T10:37:37Z
dc.date.issued 2016-05-24
dc.identifier.citation cite this article: Anthony A. Izuagie, Wilson M. Gitari & Jabulani R. Gumbo (2016): Synthesis and performance evaluation of Al/Fe oxide coated diatomaceous earth in groundwater defluoridation: Towards fluorosis mitigation, Journal of Environmental Science and Health, Part A, DOI: 10.1080/10934529.2016.1181445 en_US
dc.identifier.issn 1093-4529
dc.identifier.issn 1532-4117
dc.identifier.uri http://hdl.handle.net/11602/633
dc.description To link to this article: http://dx.doi.org/10.1080/10934529.2016.1181445 en_US
dc.description.abstract The quest to reduce fluoride in groundwater to WHO acceptable limit of 1.5 mg/L to prevent diseases such as teeth mottling and skeletal fluorosis was the motivation for this study. Al/Fe oxide-modified diatomaceous earth was prepared and its defluoridation potential evaluated by batch method. The sorbent with pHpzc 6.0 § 0.2 is very reactive. The maximum 82.3% fluoride removal attained in 50 min using a dosage of 0.3 g/100 mL in 10 mg/L fluoride was almost attained within 5 min contact time; 81.3% being the percent fluoride removal at 5 min contact time. The sorbent has a usage advantage of not requiring solution pH adjustment before it can exhibit its fluoride removal potential. A substantial amount of fluoride (93.1%) was removed from solution when a sorbent dosage of 0.6 g/100 mL was contacted with 10 mg/L fluoride solution for 50 min at a mixing rate of 200 rpm. The optimum adsorption capacity of the adsorbent was 7.633 mg/g using a solution containing initially 100 mg/L fluoride. The equilibrium pH of the suspensions ranged between 6.77 and 8.26 for 10 and 100 mg/L fluoride solutions respectively. Contacting the sorbent at a dosage of 0.6 g/100 mL with field water containing 5.53 mg/L at 200 rpm for 50 min reduced the fluoride content to 0.928 mg/L—a value below the upper limit of WHO guideline of 1.5 mg/L fluoride in drinking water. The sorption data fitted to both Langmuir and Freundlich isotherms but better with the former. The sorption data obeyed only the pseudo-second-order kinetic, which implies that fluoride was chemisorbed en_US
dc.language.iso en en_US
dc.publisher Taylor and Francis en_US
dc.subject Defluoridation en_US
dc.subject Fluorosis en_US
dc.subject Groundwater en_US
dc.subject Mitigation en_US
dc.subject Synthesis en_US
dc.subject Diatomaceous earth en_US
dc.title Synthesis and performance evaluation of AI/Fe oxide coated diatomaceous in groundwater defluoridation : towards fluoris mitigation en_US
dc.type Article en_US

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