Development of new alginate entrapped Fe(III)–Zr(IV) binary mixed oxide for removal of fluoride from water bodies

Rapid and efficient removal of fluoride ions from aqueous solution using a polypyrrole coated hydrous tin oxide nanocomposite

“…The boundary layer thickness, C i , also provides insight into the tendency for the F À ions to either adsorb onto the adsorbent phase or remain in solution. Hence larger is the intercept C i ; greater is the boundary layer effect [37]. It can be concluded from the increasing values of C i (Table S3) that with an increase in F À initial concentration, role of boundary layer effect increases.…”

A Review on Adsorption of Fluoride from Aqueous Solution

“…These include activated carbons [81,82,83,84,85,86], activated alumina [87,88,89,90], bauxite [89,91,92,93,94,95,96,97,98,99,100,101,102], hematite [95,103,104,105], polymeric resins [67,96,97,106], activated rice husk [83,98,99,107], brick powder [100], pumice stone [101,108,109], red soil, charcoal, brick, fly ash, serpentine [102,110,111], seed extracts of Moringa oleifera [98], granular ceramics [112], chitin, chitosan and alginate [95,113,114,115,116,117,118,119], modified ferric oxide/hydroxide [120,121,122,123,124,125,126], hydroxyapatite (HAP) [106,107,127,…”

A simple one-pot in-situ method for the synthesis of aluminum and lanthanum binary oxyhydroxides in chitosan template towards defluoridation of water

“…The marginal decrease of DC in alkaline pH (>9), can be attributed to the competition of the OH -ions with fluoride anion for the adsorption on the active sites of both CS@ALMOH and ALMOH. It was observed that the maximum of fluoride removal remained very high over a wide pH range (3)(4)(5)(6)(7)(8)(9) and hence the further adsorption test was carried out at neutral medium.…”

“…A number of studies were reported for the removal of fluoride using chitosan biopolymer based sorbents, lanthanum entrapped chitosan composite [5], zirconium encapsulated chitosan matrix [6], lanthanum-zirconium chitosan composite [7], hydrous ferric oxide doped alginate beads [8], Fe(III)-Zr(IV) binary oxide loaded calcium alginate beads [9], aluminium loaded alginate beads [10], metal loaded carboxylated alginate acid [11] etc. Similarly, aluminium and lanthanum modified adsorbents showed higher defluoridation capacity due to their high selectivity and chemical affinity towards fluoride than the respective bare alumina and lanthanum.…”