Chromium (VI) adsorption on boehmite.

Area of Science:

• Environmental Chemistry
• Materials Science
• Adsorption Science

Background:

• Chromium(VI) is a toxic heavy metal pollutant found in aqueous solutions.
• Effective removal of chromium(VI) is crucial for environmental protection and water safety.
• Adsorbent materials are widely studied for heavy metal remediation.

Purpose of the Study:

• To synthesize and characterize boehmite for chromium(VI) ion adsorption.
• To investigate the influence of various parameters on chromium(VI) removal efficiency.
• To evaluate the adsorption mechanism and thermodynamic feasibility.

Main Methods:

• Batch adsorption experiments were conducted to study chromium(VI) removal by boehmite.
• Adsorption isotherms were analyzed using Freundlich, Langmuir, and Dubinin-Radushkevich (D-R) models.
• Thermodynamic parameters were determined at different temperatures (293, 303, 313, and 323 K).

Main Results:

• Boehmite demonstrated significant adsorption capacity for Cr(VI) ions.
• Adsorption efficiency was influenced by contact time, initial pH, adsorbent dosage, and initial metal ion concentration.
• The adsorption process was found to be endothermic and spontaneous, with thermodynamic parameters supporting this conclusion.

Conclusions:

• Boehmite is a promising and effective adsorbent material for the removal of chromium(VI) from aqueous solutions.
• The adsorption mechanism aligns with established adsorption models.
• The spontaneous and endothermic nature of the process suggests favorable conditions for chromium remediation using boehmite.