Green and Fast Extraction of Chitin from Waste Shrimp Shells: Characterization and Application in the Removal of Congo Red Dye
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Date
2023-12-13
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Abstract
Due to their detrimental and carcinogenic effects, synthetic organic dyes pose significant
environmental and health risks. Consequently, addressing the bioremediation of industrial wastewater containing these organic dyes has become an urgent environmental concern. The adsorption
using low-cost and green materials is one of the best alternative techniques for the removal of dyes.
This study aims to investigate the use of chitin to eliminate Congo red (CR), an anionic dye, from
wastewater. The chitin was produced from shrimp shell in a quick and environmentally friendly
manner by utilizing a co-solvent (glycerol/citric acid (GLC)). The resulting adsorbent was characterized through various techniques, including X-ray diffraction (XRD), scanning electron microscopy
(SEM), and FT-IR spectroscopy. The effectiveness of CR removal with chitin was studied with respect
to contact time, adsorbent dose, initial pH, equilibrium isotherms, and kinetic and thermodynamic
parameters. It was observed that variations in the dye concentration and pH significantly influenced
the removal of CR with chitin. Under optimal operating conditions (pH = 7, contact time = 130 min,
temperature = 50 ◦C), the adsorption capacity reached 29.69 ± 0.2 mg/g. The experimental data
revealed that CR adsorption onto a chitin adsorbent is better represented by a Langmuir isotherm.