Novel MoS2/BaSO4/zeolite heterostructure composite for the enhanced visible-light photocatalytic degradation of sulfadiazine

Abstract

Molybdenum disulfide (MoS₂) can be used as a potential photocatalyst for the removal of emerging contaminants (ECs) under visible light (Vis). However, the high carrier recombination rate and aggregation restrict pure MoS₂ application. The hydrothermal method was used to prepare a novel MoS₂/BaSO₄/zeolite (Z) composite (MBZ), which was used to activate peroxymonosulfate (PMS) under visible light for sulfadiazine (SDZ) degradation. The MBZ showed a moderate E_g value (2.59 eV), indicating good visible-light absorption. The physicochemical and photoelectrochemical properties were analyzed, revealing that the hybrid MBZ significantly enhanced photoinduced carrier generation, separation, and transfer. The MBZ exhibited 2.38-, 3.24-, and 1.36-fold higher SDZ removal reaction rates than Z, BaSO₄, and MoS₂ in the PMS/Vis system. The addition of EDTA-2Na notably decreased the degradation rate (79.58–89.88%), indicating the significant role of h⁺. This work provides a new approach to the design of semiconductor/insulator photocatalysts and constructs a promising catalytic oxidation system for the green remediation of EC wastewater.