Tetracycline antibiotics have the largest input and production capacity in livestock and poultry farming around the world. In this study, a novel Cu(II)/TiO2/GO (graphene oxide) ternary composite was fabricated by the hydrothermal-dipping method. The morphological structure and physiochemical features were characterized by XPS, TEM, FT-IR and XRD. Cu(II), TiO2 and GO were successfully combined and the particle diameter of Cu(II)/TiO2/GO is about ca. 11.1 nm. With tetracycline hydrochloride as a model pollutant, the photodegradation rate of Cu(II)/TiO2/GO system under UV light was almost twice that of pure TiO2 and the final removal ratio was 98.5%. Cu(II)/TiO2/GO can absorbed more visible light than TiO2. The band gap of TiO2, TiO2/GO and Cu(II)/TiO2/GO were calculated to be 3.13 eV, 2.84 eV and 2.83 eV. EPR study showed that the formation rate of superoxide free radical and hydroxyl radicals in the Cu(II)/TiO2/GO ternary system was obviously higher than that in the pure TiO2 and TiO2/GO systems. Cu(II) and GO accelerated the separation of electron-hole pairs while slowing the recombination of holes and electrons, increasing the specific surface area and the absorption of dissolved oxygen, thereby synergistically accelerating the production of superoxide free radical, hole and hydroxyl radicals. After four cycles, the degradation rate of tetracycline hydrochloride can still reach 98.5%. In summarize, the utilization of visible light and the rate of active species production in the Cu(II)/TiO2/GO ternary system are improved compared with TiO2, which provides Cu(II)/TiO2/GO a promising opportunity for making the contribution in the practical organic wastewater treatment.

Fabrication of Cu(II)/TiO2/GO ternary composite for photocatalytic degradation of tetracycline hydrochloride

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.