Chitosan Hydrogel for Removing of Heavy Metal Ions from Water: A Review

Ali, Maysaa A.; Soud, Shemaa A.; Hameed, Anaheed H.

doi:10.30684/etj.v39i7.2015

Cited by 2 publications

(8 citation statements)

References 62 publications

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“…Firstly, the elemental analysis of chitosan flakes was performed. The obtained results from XRF analysis revealed that chitosan (finely ground) showed the presence of Al2O3 (0.18%), FeO (1.19%), Na2O (2.44%), ZnO (1.73%), Ca (18.75%), K (4.49 %), Cr (1.39 %), As (0.3%), which confirms the origin of chitosan from seaweed, being a biopolymer with a high degree of inhomogeneity [5,7].…”

Section: Resultsmentioning

confidence: 65%

“…The adsorption of metal ions on the surface of chitosan takes place through the formation of a surface complex which involves nitrogen and oxygen atoms [15][16][17]. Chitosan offers high availability through functional groups that facilitate interaction with cations and anions, leading to an improvement in binding capacity, and the chelation processes proceed relatively quickly [5][6][7]. The ion concentration effect on the amount of adsorbed Fe(III) ions onto chitosan was investigated.…”

Section: Resultsmentioning

confidence: 99%

“…A constancy of metal ions retention is observed, up to a concentration of 66.6 mg Fe/L, after more than 300 min, when using in the experiment 100 mg of chitosan. The Fe(III) ions can hardly be leached out due to the complexation between these ions and chitosan in acidic medium by nitrogen and oxygen atoms from the amino and hydroxo functional groups [6,7]. The adsorption capacity of chitosan for the metal ions is much higher in medium of lower pH.…”

Section: Resultsmentioning

confidence: 99%

“…In this regard, a natural biopolymer is chitosan, which is considered an eco-bioadsorbent, being a complex copolymer of glucosamines and N-acetylglucosamines, thus bearing functional groups that are strongly reactive for different metal ions [5]. The ability of chitosan to chelate metal ions both in solution and solid state has been intensively studied in various polymer forms, such as powder, flakes, microspheres, nanoparticles, gel beads, membranes, sponge, and fibres [6,7]. Chitosan, obtained by deacetylation of chitin, is the most abundant polymer after cellulose, and is a good alternative for the retention of metal ions in wastewater.…”

Section: Introductionmentioning

confidence: 99%

“…The literature shows that chitosan has the highest adsorption capacity for different metal ions (Cu, Cd, Zn, Mn etc.) [7,8], and the biopolymeric matrix is more affected by the type of metal ion adsorbed than by its concentration [5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Investigation of Chitosan Flakes in the Adsorption of Fe(III) Ions from Acidic Solution

Costea (Nour),

Ceoromila,

Tabacaru

et al. 2024

Rev. Chim.

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In the present work, the adsorption efficiency of chitosan flakes towards ferric ions from aqueous medium by varying several experimental factors, such as pH, adsorbent dosage, contact time and ferric ions concentration, was investigated. The obtained results have shown that the amount of adsorbed Fe(III) ions increases with the contact time, reaching the equilibrium within 5 h, at ambient temperature. The optimal pH to ensure the adsorption of Fe(III) ions was established at 3.0 - 3.2 for the solutions containing 100 mg/L and 200 mg/L Fe(III) ions. The adsorption of Fe(III) ions on chitosan flakes was established at more than 80% (mg Fe/g adsorbent). The adsorption isotherm gained through two equilibrium models, the Freundlich and Langmuir isotherms, were analysed and the equilibrium isotherm was better matched with the Langmuir model. The Fe(III) ions are adsorbed by chitosan through the amine and hydroxyl groups, chitosan being an effective adsorbent material for the retention of metal ions, with possible application in environment and medicine. Scanning electron microscopy (SEM) was also employed to confirm the eventual structural changes of the chitosan matrix upon the adsorption of Fe(III) ions.

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Section: Resultsmentioning

confidence: 65%