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a b s t r a c tIn this research, we developed a facile method to synthesize quaternary plasmonic photocatalysts Ag/AgCl/TiO 2 /MWCNTs with a high photocatalytic performance for degradation of 2,4-dichlorophenol (2,4-DCP) under visible light. The prepared samples were characterized by different analyses such as X-ray diffraction, scanning electron microscopy, energy dispersive X-ray, ultraviolet-visible diffuse reflectance spectroscopy, Fourier transform infrared spectroscopy, N 2 physisorption, and transmission electron microscopy. The prepared samples exhibited highly visible-light photocatalytic efficiency for degradation of 2,4-DCP in aqueous solution. In the presence of pure TiO 2 and quaternary Ag/AgCl/ TiO 2 /MWCNTs nanocomposite, we obtained 40% and almost 100% degradations of 2,4-DCP under visible light after 180 min irradiation, respectively. The excellent visible light photocatalytic activity of Ag/AgCl/TiO 2 /MWCNTs samples can be attributed to the surface plasmon resonance effect of Ag nanoparticles anchored on AgCl particles and adsorption ability of MWCNTs.