Sulphate-Crosslinked Chitosan as an Adsorbent for the Removal of Congo Red Dye From Aqueous Solution

Dyes are a major cause of concern nowadays as large quantities are being released into water bodies causing pollution. In this article, modified chitosan (sulphate crosslinked) has been studied for the removal of Congo red (a benzidine-based anionic diazo dye) which is a toxic dye introduced into wa...

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Bibliographic Details
Published inAir, soil and water research Vol. 11; no. 1
Main Authors Jeyaseelan, Christine, Chaudhary, Nisha, Jugade, Ravin
Format Journal Article
LanguageEnglish
Published Sage UK: London, England SAGE Publications 01.11.2018
Sage Publications Ltd
SAGE Publishing
Subjects
Adsorbents
Adsorption
Aqueous solutions
Biodegradable polymers
Chitosan
Color removal
Congo red
Crosslinking
Dyes
Fourier transforms
Industrial wastes
Industrial wastewater
Infrared spectroscopy
Order parameters
Original Research
pH effects
Scanning electron microscopy
Sodium hydroxide
spectrophotometer
Spectrum analysis
Sulfates
sulphate crosslinking
Wastewater
Water pollution
X-ray diffraction
X-ray spectroscopy
chitosan
spectrophotometer
Congo red
sulphate crosslinking
Biodegradable polymers
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Summary:Dyes are a major cause of concern nowadays as large quantities are being released into water bodies causing pollution. In this article, modified chitosan (sulphate crosslinked) has been studied for the removal of Congo red (a benzidine-based anionic diazo dye) which is a toxic dye introduced into water bodies from textile industries. Sulphate-crosslinked chitosan (SCC) was prepared in the laboratory and the characterization of SCC was done by Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). Various parameters such as pH, contact time, adsorbent dosage, and concentration of adsorbent were optimized. The adsorption capacity was determined at pH 3.0, at which the percentage recovery was about 90% and followed Freundlich adsorption isotherm with an adsorption capacity of 91.8 mg/g. The adsorption followed pseudo-second-order kinetics. Various thermodynamic parameters were also determined for the change in adsorption with temperature. The SCC was regenerated with NaOH and showed good recycling capacity. The modified chitosan was applied for the removal of Congo red from industrial wastewater samples (spiked).
ISSN:1178-6221
1178-6221
DOI:10.1177/1178622118811680