In this study, a type of nano-photocatalyst of MoS 2 /g-C 3 N 4 with a 2D/2D heterostructure was successfully developed using the impregnationcalcination method. The developed composite catalyst exhibited enhanced photocatalytic activity and stability in the removal of Rhodamine B (RhB) and vaporous Hg 0 under the irradiation of visible light. The introduced MoS 2 nanosheets could serve as a platform for the dispersion of g-C 3 N 4 nanosheets, which was conducive to the exposure of more active sites. In addition, the MoS 2 nanosheets also facilitated the capacity for absorption of optical light and separation of the photogenerated electron from the hole, leading to the promotion of photocatalytic efficiency.

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Defect engineering is a promising method for improving the performance of MoS2 in various fields. In this study, sulfur-defect-enriched MoS2 (SD-MoS2) nanosheets were fabricated via a facile microwave-hydrothermal strategy in 10 min for tetracycline (TC) adsorption applications. The introduction of sulfur defects in MoS2 induced more exposed unsaturated sulfur atoms at the edge, enhancing the interaction between the adsorbent and antibiotic and improving the adsorption activity of the antibiotic. Density functional theory calculations further revealed that sulfur defects in MoS2 could alter the electronic structure and exhibited low TC adsorption energy of −2.09 eV. This work provides a new method for fabricating MoS2 nanosheets and other transition metal dichalcogenide-based adsorbents with enhanced antibiotic removal performance and a comprehensive understanding of antibiotic removal mechanisms in SD-MoS2.