Waste Animal Bone-derived Calcium Phosphate Particles with High Solar Reflectance

TL;DR

This study develops highly reflective calcium phosphate nanoparticles from waste animal bones, offering an eco-friendly, cost-effective material for solar cooling applications with potential environmental benefits.

Contribution

It introduces a novel method to produce high-reflectance calcium phosphate particles from waste bones, matching synthetic materials in solar reflectance.

Findings

Achieved over 90% reflectance in solar wavelengths.

Produced nanoparticles with suitable size and packing density.

Demonstrated potential for sustainable, low-cost cooling pigments.

Abstract

Highly reflective Calcium Phosphate (CAP) nanoparticles have been obtained from waste chicken and porcine bones. Chicken and pork bones have been processed and calcined at temperatures between 600{\deg}C and 1200{\deg}C to remove organic material and resulting in CAP bio-ceramic compounds with high reflectance. The reflectivity of the materials in the solar wavelength region is on par with chemically synthesized CAP. The high reflectivity, consistently over 90%, as well as the size distribution and packing density of the nanoparticles obtained in these early bone studies make a strong case for pursuing this avenue to obtain pigment for high solar reflectivity applications, such as passive daytime radiative cooling. The results presented indicate a viable path toward a cost-effective and eco-friendly source of highly reflective cooling pigments. By sourcing calcium phosphates from animal bones, there is also the potential to divert large quantities of bone waste generated by the meat industry from landfills, further contributing toward sustainability and energy reduction efforts in the construction industry and beyond.