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

Abstract

In this work, biogenic hydroxyapatite (BHap) obtained from cattle bone waste is proposed as an adsorbent of this dangerous pollutant. Density functional theory (DFT) and calorimetric studies were developed to study the interaction between BHap and glyphosate (GLY). A strong interaction was found in the experiments through the measurement of immersion enthalpy, confirmed by the exothermic chemisorption obtained with DFT calculations. These results suggest that hydroxyapatite is a promising adsorbent material for GLY adsorption in aqueous solutions. In addition, it was determined that the GLY–hydroxyapatite interaction is greater than the water–hydroxyapatite interaction, which favors the GLY adsorption into this material.

Hydroxyapatite as a Material for Transplantology: Clinical Experience and Prospects of Application

“…Special attention should be paid to the methods of hydroxyapatite production from biogenic sources, the main examples of which are presented in Table 2. The most popular raw material for this method of hydroxyapatite production is the use of various biological wastes: bovine bone mass [163,164], eggshells [165,166], marine organisms [167][168][169][170] and plant materials. The latter can be used to extract hydroxyapatite per se [171] as a solvent [172,173] or as a source of calcium [174] and as a source of phosphate [175,176].…”