Abstract
Recently, metal organic frameworks (MOFs) has been widely studied and used as a catalyst in various fields, due to its high specific surface area, tunable channels and excellent thermal and chemical stability. In this paper, MIL-125(Ti) was used as a precursor to fabricate Ag doped tablet-like TiO2@carbon composites (Ag–TiO2@carbon) and used as catalyst for degradation of rhodamine B (RhB). The influence of Ag doping on the photocatalytic activity of TiO2@carbon has been explored. All samples were well characterized by XRD, SEM, TEM, and UV–vis diffuse reflectance spectra. The results show that MIL-125(Ti) was completely transformed into TiO2@carbon when it was calcined at 600 °C for 2 h under Ar atmosphere, and Ag was well loaded onto TiO2@carbon. The photocatalytic efficiency of TiO2@carbon is 92.46%. When TiO2@carbon was doped with Ag (Ag–TiO2@carbon), its photocatalytic efficiency was highly improved to 98.85%. Furthermore, Ag/TiO2@carbon exhibited high photocatalytic stability. After five repeated cycles, the photocatalytic activity of Ag–TiO2@carbon was highly retained at 95.58%.
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