Calcium phosphates are suggested as a CO₂ adsorbent via pressure swing adsorption. Amorphous calcium phosphate (ACP) and biphasic calcium phosphate (BCP) (composed of hydroxyapatite and beta-tricalcium phosphate) were investigated for the capture/immobilization of the gas. A fluidized bed was set up to assess the levels of CO₂ adsorption by ACP and BCP. A gaseous mixture was synthesized, mimicking the conditions for possible industrial use. The results show a significant reduction in CO₂ concentrations. Using DFT calculations, we show that CO₂ adsorption increases the stability by reducing the surface energy. The energies involved and preferential adsorption sites were also theoretically predicted.

建议通过变压吸附将磷酸钙作为CO ₂吸附剂。研究了无定形磷酸钙（ACP）和双相磷酸钙（BCP）（由羟基磷灰石和β-磷酸三钙组成）用于气体的捕集/固定化。设置流化床以评估ACP和BCP对CO _2的吸附水平。合成了气态混合物，模拟了可能的工业用途条件。结果表明CO ₂浓度显着降低。使用DFT计算，我们表明CO ₂吸附通过降低表面能来增加稳定性。理论上还预测了所涉及的能量和优先吸附位。