A Z-scheme g-C 3 N 4 /Ag/MoS 2 ternary plasmonic photocatalyst in a flowerlike architecture of diameter about 0.4− 0.6 μm is successfully synthesized by a reliable and effective method. The as-synthesized g-C 3 N 4 /Ag/MoS 2 photocatalyst showed excellent improvement for visible-light absorption and separation efficiency of photoinduced electron−hole pairs. The g-C 3 N 4 / Ag/MoS 2 system exhibits optimum visible-light-induced photocatalytic activity in degrading Rhodamin B (RhB), which is 9.43fold and 3.56-fold of Ag/MoS 2 and g-C 3 N 4 /MoS 2 systems, and 8.78-fold and 2.08-fold in the production of hydrogen (H 2 ) out of water, respectively. The excellent photocatalytic activities are attributed to the synergetic effects of Ag, g-C 3 N 4 , and MoS 2 nanophase structures in the g-C 3 N 4 /Ag/MoS 2 composites, which result in a Z-scheme-mechanism-assisted fast separation and slow recombination of photoinduced electron−hole pairs and thereby higher photocatalytic activity. KEYWORDS: g-C 3 N 4 -based nanocomposite, Silver, MoS 2 flower, Z-scheme mechanism, Photocatalysis

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