Preparation of novel alginate based anion exchanger from Ulva japonica and its application for the removal of trace concentrations of fluoride from water.
A green seaweed, Ulva japonica, was modified by loading multivalent metal ions such as Zr(IV) and La(III) after CaCl2 cross-linking to produce metal loaded cross-linked seaweed (M-CSW) adsorbents, which were characterized by elemental analysis, functional groups identification, and metal content determination. Maximum sorption potential for fluoride was drastically increased after La(III) and Zr(IV) loading, which were evaluated as 0.58 and 0.95 mmol/g, respectively. Loaded fluoride was quantitatively desorbed by using dilute alkaline solution for its regeneration. Mechanism of fluoride adsorption was inferred in terms of ligand exchange reaction between hydroxyl ion on co-ordination sphere of the loaded metal ions of M-CSW and fluoride ion in aqueous solution. Application of M-CSW for the treatment of actual waste plating solution exhibited successful removal of fluoride to clear the effluent and environmental standards in Japan, suggesting high possibility of its application for the treatment of fluoride rich waste water.
Department of Applied Chemistry, Saga University, Honjo 1, Saga 840-8502, Japan.
Hari
H
Paudyal
Bimala
B
Pangeni
Katsutoshi
K
Inoue
Hidetaka
H
Kawakita
Keisuke
K
Ohto
Kedar Nath
KN
Ghimire
Shafiq
S
Alam
D000327:Adsorption; D000464:Alginates / Q000737:chemistry*; D000837:Anion Exchange Resins / Q000737:chemistry*; D061249:Batch Cell Culture Techniques; D003432:Cross-Linking Reagents / Q000737:chemistry; D005459:Fluorides / Q000302:isolation & purification*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D012624:Seaweed / Q000737:chemistry; D012996:Solutions; D013055:Spectrophotometry, Infrared; D013696:Temperature; D044445:Ulva / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
D000464:Alginates; D000837:Anion Exchange Resins; D003432:Cross-Linking Reagents; D005459:Fluorides; D020723:Glucuronic Acid; D006603:Hexuronic Acids; D012996:Solutions; D062065:Wastewater; D014874:Water Pollutants, Chemical
Alginate; Fluoride removal; Metal loading; Waste seaweed; Zirconium(IV) ion