A significant proportion of antimicrobial agents, such as different antibiotics discharged into the environment via human and animal waste, poses significant problems for ecological balance and human health. Moreover, widespread overuse and misuse of antibiotics have led to antibiotic-resistant bacteria (superbugs), which is one of the biggest global health problems in the 21st century. Since the utilization of solar energy, which is an abundant and natural resource for the photocatalytic system, we report the design of a photothermal-photocatalytic dual-functional light absorber-based ternary heterostructure using plasmonic gold nanoparticle (AuNP)-anchored WO