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Abstract. Ag/AgCl/Ag 3 PO 4 plasmonic nanocatalysts were prepared through the ion exchange and subsequently light-induced process. The obtained samples showed a high photodegradation capacity for prometryn, bentazone and metribuzin under visible light irradiation. Effects of reduction time (RT) and Cl/P in the synthesis process on the photocatalytic activity of Ag/AgCl/Ag 3 PO 4 were explored in this study. When RT was 30 min, the RE of prometryn, metribuzin and bentazone reached the maxima of 99.86%, 98.20% and 97.12%, respectively. As Cl/P was 1.5, prometryn, bentazone and metribuzin were decomposed completely within 15, 30 and 20 min, respectively. The stability of Ag/AgCl/Ag 3 PO 4 photocatalysts was investigated and confirmed with 5-cycling experiments.