Synthesis of High‐Purity Monocalcium Phosphate Monohydrate from Crab Shell Waste

Abstract

Waste crab shells (CS) have the potential to mineralize CO2, yielding precipitated calcium carbonate (PCC) powder feedstock for use in the synthesis of monocalcium phosphate monohydrate (MCPM) in an acidic condition by partial neutralization of phosphoric acid at 90 °C and varying times (30–120 min), followed by evaporation of the water at 100 °C. The PCC and MCPM products were analyzed using X‐ray powder diffraction, Fourier transform infrared spectroscopy, and the scanning electron microscopy/energy dispersive X‐ray method. After 120 min of stirring, the pure MCPM revealed uniform particle sizes from 1 to 3 μm. The presented MCPM synthesis using the PCC powder precursor may assist in developing a large‐scale MCPM industry while recycling a considerable quantity of CS waste.