Merck
  • Home
  • Search Results
  • Synthesis and applications of eco-magnetic nano-hydroxyapatite chitosan composite for enhanced fluoride sorption.

Synthesis and applications of eco-magnetic nano-hydroxyapatite chitosan composite for enhanced fluoride sorption.

Carbohydrate polymers (2015-10-03)
Kalimuthu Pandi, Natrayasamy Viswanathan
ABSTRACT

Adsorption is a significant reaction occurs between adsorbent/water interface for controlling the pollutants in the aqueous environment. In this regard, an eco-magnetic biosorbent was prepared by uniform deposition of magnetic Fe3O4 particles on the surface of nano-hydroxyapatite (n-HAp)/chitosan (CS) nanocomposite namely Fe3O4@n-HApCS composite as versatile sorbent for fluoride sorption. The resulting Fe3O4@n-HApCS nanocomposite was characterized by FTIR and SEM with EDAX techniques. The defluoridation capacity (DC) was found to depend on the contact time, pH, co-existing anions, initial fluoride concentration and temperature. The sorption isotherm was investigated by Freundlich, Langmuir and Temkin isotherm models using the batch method. The thermodynamic parameters revealed the feasibility, spontaneity and endothermic nature of fluoride sorption. The results of this research work designated that Fe3O4@n-HApCS composite having the excellent defluoridation capacity than the individual components and interesting to note that the easy magnetic separation of Fe3O4@n-HApCS composite from aqueous medium.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Ammonia solution, 2.0 M in isopropanol
Sigma-Aldrich
Iron(III) chloride hexahydrate, ACS reagent, 97%
Sigma-Aldrich
Ammonia solution, 2.0 M in methanol
Sigma-Aldrich
Ammonia solution, 7 N in methanol
Sigma-Aldrich
Ammonia solution, 2.0 M in ethanol
Sigma-Aldrich
Iron(III) chloride hexahydrate, puriss. p.a., ACS reagent, crystallized, 98.0-102% (RT)
Sigma-Aldrich
Iron(III) chloride hexahydrate, reagent grade, ≥98%, chunks
Sigma-Aldrich
Ammonia solution, 0.4 M in dioxane
Sigma-Aldrich
Iron(III) chloride hexahydrate, puriss. p.a., reag. Ph. Eur., ≥99%
Sigma-Aldrich
Ammonia solution, 4 M in methanol
Sigma-Aldrich
Ammonia-14N, 99.99 atom % 14N
Sigma-Aldrich
Ammonia solution, 0.4 M in THF
Sigma-Aldrich
Calcium nitrate tetrahydrate, BioXtra, ≥99.0%
Sigma-Aldrich
Calcium nitrate tetrahydrate, suitable for cell culture, suitable for plant cell culture
Sigma-Aldrich
Ammonium phosphate monobasic, suitable for plant cell culture
Sigma-Aldrich
Iron(II) chloride tetrahydrate, 99.99% trace metals basis
Sigma-Aldrich
Ammonium dihydrogenphosphate, 99.999% trace metals basis
Sigma-Aldrich
Ammonium phosphate monobasic, ReagentPlus®, ≥98.5%
Sigma-Aldrich
Sodium fluoride, ACS reagent, ≥99%
Sigma-Aldrich
Iron(II) chloride tetrahydrate, puriss. p.a., ≥99.0% (RT)
Sigma-Aldrich
Ammonium phosphate monobasic, ≥99.99% trace metals basis
Sigma-Aldrich
Ammonium phosphate monobasic, ACS reagent, ≥98%
Sigma-Aldrich
Calcium nitrate tetrahydrate, ≥99.0%
Sigma-Aldrich
Iron(II) chloride tetrahydrate, ReagentPlus®, 98%