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Surface properties of photocatalysts are crucial to improve their efficiency in the removal of waste water pollutants.In this study,phosphate-modified BiPO4 photocatalysts with different PO4 3-/Bi molar ratios were controllably synthesized through a one-pot hydrothermal method.The concentrations of surface hydroxyl groups on BiPO4 samples can be tuned by adjusting the PO4 3-/Bi3+ molar ratios.