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The monoclinic BiVO 4 was synthesized via a facile one-pot hydrothermal synthesis. KCl concentration in the precursor greatly influences the crystal growth, morphology, and absorption properties of BiVO 4 attributed to the effect of Clˉ ions on the formation of BiOCl intermediate and preferential growth of BiVO 4 crystals along {010} planes. The photocatalytic property of BiVO 4 is accordingly altered based on the KCl content. The “shuriken-like” BiVO 4 prepared with 3​ mmol of KCl exhibits the highest photocatalytic activity among our samples. Its photocatalytic rhodamine B degradation efficiency could reach 94.7% after 4​ h of visible-light irradiation. The degradation efficiency only decreased to 90.8% after four runs of 4 h irradiation. The photodegradation rate with the shuriken-like BiVO 4 is around 2.3 times higher than that with the rod-like BiVO 4 prepared without KCl, owing to its highest relative intensity ratio …