Constructing a novel Ag2MoO4/MIL-101(Fe)/Ag composite for efficient crystal violet degradation via photo-Fenton-like process

This study presents a novel ternary Ag2MoO4/MIL-101(Fe)/Ag catalyst for efficient crystal violet (CV) degra-dation under visible light. Silver nanoparticles were in-situ generated on Ag2MoO4/MIL-101(Fe) through Ag2MoO4 reduction with NaBH4. Extensive characterization (XRD, FT-IR, FE-SEM, EDX, TEM, UV-Vis DRS, BET, PL spectroscopy) confirmed the catalyst's structure. The ternary composite exhibited significantly enhanced photo-Fenton catalytic activity, with reaction rates approximately 3.5 and 5 times faster than those observed with the Ag2MoO4/MIL-101(Fe) and pristine catalysts, respectively. Optimal conditions (H2O2 concentration of 50 mM, catalyst dosage of 2 g/L, pH 7, CV concentration of 25 mg/L, and temperature of 25 degrees C) were deter-mined. Hydroxyl radicals dominated CV degradation, with minor contributions from electrons, holes, and su-peroxide radicals. The ternary composite showed excellent reusability, retaining over 92 % CV degradation efficiency after five cycles. The Ag2MoO4/MIL-101(Fe)/Ag composite demonstrates great potential for efficient and stable organic dye degradation, promising advancements in water treatment applications.