(US20190150432) What is claimed is: 1. A composition of matter comprising: a hydroxyapatite particle; and a triazine-based herbicide adsorbed to a surface of the hydroxyapatite particle. 2. The composition of matter of claim 1, further comprising a urea molecule adsorbed to the surface of the hydroxyapatite particle. 3. The composition of matter of claim 1, wherein the triazine-based herbicide is a preemergent herbicide. 4. A composition of matter comprising: a hydroxyapatite particle; and a triazine-based herbicide chemically bound to a surface of the hydroxyapatite particle via a urea linkage. 5. The composition of matter of claim 4, wherein the triazine-based herbicide is a preemergent herbicide. 6. The composition of matter of claim 4, wherein the urea linkage is formed via a chemical reaction of an amine group of the triazine-based herbicide and an isocyanate functional group that is linked to the surface of the hydroxyapatite particle. 7. A process comprising: forming a solution that includes an isocyanate-functionalized hydroxyapatite particle and a triazine-based herbicide, the isocyanate-functionalized hydroxyapatite particle including an isocyanate functional group that is linked to a surface of the hydroxyapatite particle; and initiating a chemical reaction to chemically bind the triazine-based herbicide to the surface of the hydroxyapatite particle via a urea linkage, the urea linkage resulting from a chemical reaction of an amine group of the triazine-based herbicide and the isocyanate functional group of the isocyanate-functionalized hydroxyapatite particle. 8. The process of claim 7, further comprising chemically reacting a diisocyanate material with surface hydroxyl groups of a hydroxyapatite particle to form the isocyanate-functionalized hydroxyapatite particle. 9. The process of claim 8, wherein the diisocyanate material includes methylene diphenyl diisocyanate (MDI) or toluene diisocyanate (TDI). 10. The process of claim 7, wherein the triazine-based herbicide includes a primary amine group. 11. The process of claim 7, wherein the triazine-based herbicide includes a secondary amine group. 12. The process of claim 7, wherein the triazine-based herbicide has the following chemical structure: 13. The process of claim 7, wherein the triazine-based herbicide has the following chemical structure: 14. The process of claim 7, wherein the triazine-based herbicide has the following chemical structure: 15. The process of claim 7, wherein the triazine-based herbicide has the following chemical structure: 16. The process of claim 7, wherein the triazine-based herbicide has the following chemical structure: 17. The process of claim 7, wherein the triazine-based herbicide has the following chemical structure: 18. The process of claim 7, wherein the triazine-based herbicide has the following chemical structure: 19. The process of claim 7, wherein the triazine-based herbicide has the following chemical structure: 20. The process of claim 7, wherein the triazine-based herbicide has the following chemical structure:
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