The photocatalytic properties and construction of a WS2/MoS2/CdS heterojunction

Abstract

WS₂/MoS₂/CdS (WMC), a photocatalyst with excellent photocatalytic performance, was synthesized via a coprecipitation hydrothermal method, and WS₂/MoS₂ was loaded on the CdS surface. The addition of WS₂/MoS₂ reduced the bandwidth of CdS, with lower electron–hole complex efficiency. When the mass ratio of WS₂/MoS₂ is 5%, the photocatalytic efficiency of the photocatalyst is 98.15% after 240 min. The reaction rate constant of 5%-WMC is 0.01866 min⁻¹, which is 6.17 times higher and 2.47 times higher than those of CdS and WS₂/MoS₂, respectively. Capture agent tests showed that the active groups of the photocatalytic degradation process were O₂⁻˙ and h⁺. The catalytic activity remained relatively stable over four experimental cycles.