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  3. Volume 17, Number 2, 2023
  4. Use of Chemically Modified Chitosan for the Adsorptive Removal of Toxic Metal Ions in Aqueous Solutions

Use of Chemically Modified Chitosan for the Adsorptive Removal of Toxic Metal Ions in Aqueous Solutions

JCCT.
2023;
Volume 17, Number 2
: pp. 407 - 419
https://doi.org/10.23939/chcht17.02.407
Authors:
  1. Fadi Alakhras
  2. Huda Alghamdi
  3. Rabia Rehman
1
Department of Chemistry, College of Science, Imam Abdulrahman Bin Faisal University
2
Department of Chemistry, College of Science, Imam Abdulrahman Bin Faisal University
3
Center for Inorganic Chemistry, Shcool of Chemistry, University of Punjab

Chemical modification of chitosan was successfully carried out using three derivatives namely: 3 hydroxybenzaldehyde, 2,3-dihydroxybenzaldehyde, and 3,5-di-tert-butyl-2-hydroxybenzaldehyde by a condensation reaction. Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) surface area, thermal gravimetric analysis (TGA), and X-ray diffraction (XRD) methods were performed for characterization of the chitosan-derived Schiff base adsorbent materials. The efficiency of the prepared adsorbents in removing cobalt and nickel ions from aqueous solution was explored, and experimental data were analyzed using isothermal and kinetic models. The BET surface area of chemically modified chitosan was greatly enhanced 125.83 m2 g-1 with mesoporous characteristics. The maximum uptake was recorded at pH 5-6, while the maximum removal capacity was 243.90 mg g-1 for cobalt ions whereas 166.67 mg g -1 was achieved for nickel ions. The kinetic data were better fitted using pseudo-second-order.

toxic ions
chitosan
wastewater treatment
adsorption
Schiff-based adsorbent
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