Synergistic Interfacial Interaction of Au and MnO _<i>x</i> Dual Cocatalysts on Facet-Engineered BiOBr for Photocatalytic Glyphosate Degradation

Glyphosate, a nonselective broad-spectrum herbicide widely used globally, has accumulated in the environment, posing significant risks to ecological balance and human health. Although solar-driven photocatalysis offers a promising remediation strategy, practical applications are hindered by severe charge carrier recombination and low solar energy conversion efficiency. Here, we report a dual-cocatalyst-modified BiOBr system, in which Au nanoparticles and MnO x nanosheets are selectively photodeposited on the lateral (200) facet and the dominant (001) facet, respectively. Under visible-light irradiation (λ > 420 nm), Au/MnO x /BiOBr exhibits the optimal photocatalytic activity with a glyphosate degradation rate constant of 0.0907 min –1, which is 50-fold higher than that of pristine BiOBr (0.0019 min –1 ). The enhanced performance is attributed to the synergistic effects of efficient internal carrier transfer and accelerated surface charge separation, which collectively suppress charge recombination. This study underscores the critical role of spatial cocatalyst distribution in designing high-efficiency photocatalysts for sustainable environmental remediation.