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Molecules. 2019 Feb 28;24(5). pii: E847. doi: 10.3390/molecules24050847.

The Removal of Brilliant Green Dye from Aqueous Solution Using Nano Hydroxyapatite/Chitosan Composite as a Sorbent.

Author information

1
Department of Chemistry, Collage of Science, King Khalid University, Abha 61413, Saudi Arabia. ahrejab@kku.edu.sa.
2
Department of Chemistry, Collage of Science, King Khalid University, Abha 61413, Saudi Arabia. inas.2011@yahoo.com.
3
Department of Chemistry, Collage of Science, King Khalid University, Abha 61413, Saudi Arabia. ddeyaa@kku.edu.sa.

Abstract

Nanocomposites of natural bone that show some benefits in terms of both composition and microstructure were synthesized by an in situ precipitation method. Hydroxyapatite (Hap) was prepared from cost-effective precursors within chitosan (CS) dissolved in aqueous acetic acid solution. The nanocomposite was synthesized for the removal of brilliant green dye (BG) from a contaminated water solution. The compositional and morphological properties of the nanocomposite were studied by means of FTIR spectroscopy, X-ray diffraction (XRD), SEM, and TEM analysis. Batch experiments were carried out to investigate the effects of pH, contact time, and initial concentration, as well as the adsorbent dosage and zero point charge for the sorbent to determine a suitable medium for the adsorption process. The sorption models using Mories-Weber, Lagrange, and Bangham equations were used to identify the mechanism and reaction order. The isotherm model was carried out using Langmuir, Freundlich, and Dubinin-Radusekevisch-Kanager equations to calculate the adsorption capacity and type of adsorption. Thermodynamic parameters, enthalpy change (∆Ho), entropy change (∆So), and Gibbs free energy (∆Go) were evaluated. All of the results suggest the feasibility of using nanocomposites as a sorbent for brilliant green dye removal.

KEYWORDS:

brilliant green dye; chitosan; hydroxyapatite; kinetic and isotherm models; nanocomposites; nanoparticles

PMID:
30823358
PMCID:
PMC6429269
DOI:
10.3390/molecules24050847
[Indexed for MEDLINE]
Free PMC Article

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