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pH value is a key factor in the preparation of nano-sized TiO2 with hydrothermal method. Using Ti(SO4)2 as the titanium source, H2O2 as the complexing agent, NaOH and HCl as the pH value regulator, nano-sized TiO2 powder with various morphologies and sizes was synthesized. Changes in morphology, size and phase type with pH values of samples were characterized by X-ray diffraction (XRD) and transmission...