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dc.contributor.authorMoirana, Ruth
dc.contributor.authorMkunda, Josephine
dc.contributor.authorMachunda, Revocatus
dc.contributor.authorParadelo, Marcos
dc.contributor.authorMtei, Kelvin
dc.date.accessioned2024-02-28T08:07:20Z
dc.date.available2024-02-28T08:07:20Z
dc.date.issued2022-12-10
dc.identifier.urihttps://doi.org/10.1016/j.envadv.2022.100329
dc.identifier.urihttps://dspace.nm-aist.ac.tz/handle/20.500.12479/2470
dc.descriptionThis research article was published in the Environmental Advances Volume 11, 2022en_US
dc.description.abstractThis study investigated the defluoridation efficiency of hydroxyapatite-activated seaweed (Eucheuma Cottonii) biochar (HSB) at various soil pH ranges (3–11) while monitoring the impact of contact time (30 min - 2.5 h), adsorbent dosage (0.1–0.5 g) as well as the initial fluoride concentration and compare its performance to its respective seaweed biochar (SB). Activation of SB with the hydroxyapatite lead to a shift in its point-zero-charge (pHPZC) from 6 to 7.4 broadening its defluoridation pH range from a solitary 5 to amid 3 through 11. The fluoride adsorption mechanism was found to follow both Langmuir (R2 = 0.956) and Freundlich (R2 = 0.942) isotherm models with a maximum defluoridation capacity of 3.03 mg/g equivalent to the defluoridation efficiency of 79%. This is accounted to the existence of soil ions, SB active sites, and the attached hydroxyapatite, as fluoride adsorption sites each exhibiting a dissimilar fluoride removal mechanism. Therefore, the HSB could be a promising adsorbent for fluoride removal in the fluoride contaminated agricultural soils of inclusive pH ranges.en_US
dc.language.isoenen_US
dc.publisherElsevier Ltd.en_US
dc.subjectFluorideen_US
dc.subjectHydroxyapatiteen_US
dc.subjectRemediationen_US
dc.subjectSeaweed biocharen_US
dc.subjectSoilen_US
dc.titleHydroxyapatite-activated seaweed biochar for enhanced remediation of fluoride contaminated soil at various pH ranges.en_US
dc.typeArticleen_US


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