Cr(III)-imprinted polymeric beads: Sorption and preconcentration studies.

Area of Science:

• Analytical Chemistry
• Materials Science
• Environmental Science

Background:

• Chromium (III) is a toxic heavy metal pollutant.
• Selective and efficient adsorbents are needed for chromium (III) detection and removal.
• Molecular imprinting offers a promising approach for creating selective adsorbents.

Purpose of the Study:

• To synthesize a novel molecularly imprinted polymer for selective chromium (III) analysis.
• To evaluate the adsorption capacity and selectivity of the developed adsorbent.
• To investigate the feasibility of using the adsorbent in sorption-desorption cycles.

Main Methods:

• Synthesis of a chromium (III)-methacryloylhistidine complex monomer.
• Polymerization of ethyleneglycoldimethacrylate and the complex to form imprinted beads.
• Batch adsorption experiments to study the effect of concentration, pH, and time.
• Competitive adsorption studies with other metal ions (Co(II), Ni(II), Cr(VI)).

Main Results:

• The synthesized polymer, poly(EDMA-MAH/Cr(III)), exhibited selective cavities for chromium (III) ions.
• Sorption equilibrium was reached within approximately 30 minutes.
• The maximum adsorption capacity for chromium (III) was 69.28 mg/g.
• The adsorbent showed significantly higher selectivity for Cr(III) compared to Co(II), Ni(II), and Cr(VI).

Conclusions:

• The developed molecularly imprinted polymer is a highly selective and efficient adsorbent for chromium (III).
• The adsorbent demonstrates potential for practical applications in chromium (III) analysis and removal.
• The reusability of the adsorbent indicates its economic feasibility.