Biogenic Hydroxyapatite Obtained from Bone Wastes Using CO₂-Assisted Pyrolysis and Its Interaction with Glyphosate: A...

Area of Science:

• Materials Science
• Environmental Chemistry
• Computational Chemistry

Background:

• Glyphosate (GLY) is a widely used herbicide and a dangerous pollutant.
• Effective and sustainable methods for glyphosate removal from aqueous solutions are needed.
• Biogenic hydroxyapatite (BHap) derived from waste materials offers a potential solution.

Purpose of the Study:

• To investigate the potential of biogenic hydroxyapatite (BHap) as an adsorbent for glyphosate (GLY).
• To elucidate the interaction mechanisms between BHap and GLY using experimental and computational methods.

Main Methods:

• Calorimetric studies, specifically immersion enthalpy measurements, were used to quantify the BHap-GLY interaction.
• Density Functional Theory (DFT) calculations were employed to model and confirm the chemisorption process.
• Comparative analysis of GLY-BHap and water-BHap interactions was performed.

Main Results:

• A strong interaction between BHap and GLY was experimentally observed through immersion enthalpy measurements.
• DFT calculations confirmed an exothermic chemisorption process, indicating a stable BHap-GLY interaction.
• The GLY-BHap interaction strength was found to be greater than the water-BHap interaction.

Conclusions:

• Biogenic hydroxyapatite (BHap) is a promising and sustainable adsorbent material for glyphosate (GLY) removal.
• The strong, selective interaction favors GLY adsorption over water, enhancing its efficiency in aqueous solutions.
• Utilizing cattle bone waste for BHap production offers an environmentally sound approach to pollutant remediation.