Performance of chitosan engraved iron and lanthanum mixed oxyhydroxide for the detoxification of hexavalent chromium

Jayaram Preethi; Sivakumar Vigneshwaran; Sankaran Meenakshi

doi:10.1016/j.ijbiomac.2019.02.101

Performance of chitosan engraved iron and lanthanum mixed oxyhydroxide for the detoxification of hexavalent chromium

Int J Biol Macromol. 2019 Jun 1:130:491-498. doi: 10.1016/j.ijbiomac.2019.02.101. Epub 2019 Feb 19.

Authors

Jayaram Preethi¹, Sivakumar Vigneshwaran¹, Sankaran Meenakshi²

Affiliations

¹ Department of Chemistry, The Gandhigram Rural Institute - Deemed to be University, Gandhigram, 624 302 Dindigul, Tamil Nadu, India.
² Department of Chemistry, The Gandhigram Rural Institute - Deemed to be University, Gandhigram, 624 302 Dindigul, Tamil Nadu, India. Electronic address: sankaranmeenakshi2014@gmail.com.

PMID: 30794904
DOI: 10.1016/j.ijbiomac.2019.02.101

Abstract

The iron - lanthanum mixed oxyhydroxide (FLMOH) and chitosan engraved iron - lanthanum mixed oxyhydroxide materials (CSFLMOH) were prepared successfully and utilized for the hexavalent chromium adsorption studies. The physicochemical properties of pristine and Cr(VI) treated adsorbents were characterized using XRD, FTIR, SEM with EDX, TGA and DSC analysis. The efficacy of the CSFLMOH was compared with FLMOH towards the uptake of Cr(VI) ions and was explored using batch technique under various influencing parameters viz., time, dose, pH, initial concentration and co-existing anions. Langmuir, Freundlich and Dubinin - Radushkevich isotherms were used to analyze the adsorption behavior at 303, 313 and 323 K. The rate of the reaction was calculated using reaction based and diffusion-based models. Recycle and reuse studies were demonstrated using 0.05 M NaOH as the desorbing medium.

Keywords: Chitosan; Chromium; Mixed oxyhydroxides; Regeneration.

MeSH terms

Adsorption
Chitosan / chemistry*
Chromium / chemistry*
Hydrogen-Ion Concentration
Iron / chemistry*
Kinetics
Lanthanum / chemistry*
Models, Theoretical
Spectrum Analysis
Thermodynamics
Water Pollutants, Chemical / chemistry
Water Purification / methods

Substances

Water Pollutants, Chemical
Chromium
chromium hexavalent ion
Lanthanum
Chitosan
Iron