In the synthesis of copper phosphate hydroxide, Cu₂PO₄(OH), crystals via simple wet chemical route, a pH-dependent morphology evolution was observed. By changing the pH value from 2.8 to 4.0, the morphology of crystals was varied from micro-sized rod to nano-sized dendritic rods. Furthermore, the reaction time and temperature were controlled to varying the size of the copper phosphate hydroxide crystals. The crystal structure, morphology and optical properties were investigated by XRD, SEM and UV-vis spectroscopy, respectively. Photocatalytic properties were evaluated using FT-IR spectroscopy via the disappearance of stearic acid (SA). The deference of the decomposition rate with morphology was discussed in a view of the specific surface area.

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