首页|A novel slag-based Ce/TiO2@LDH catalyst for visible light driven degradation of tetracycline: performance and mechanism
A novel slag-based Ce/TiO2@LDH catalyst for visible light driven degradation of tetracycline: performance and mechanism
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NSTL
Elsevier
As a kind of bulk solid waste in iron and steel industry, titanium-bearing blast furnace slag (Ti-BFS) poses a serious threat to the environment, its disposal and reuse has been a hot and difficult spot. In this study, a new and high efficient hydrotalcite-like photocatalytic material (denoted CeTL) was prepared from Ti-BFS, and applied to the visible light catalytic degradation of antibiotics in water environment. The results showed that the degradation rate of tetracycline (TC) by the optimized CeTL reached 92.8% after 90 min of illumination. Dissolved organic matter with molecular weight 1–3 kDa was the most inhibiting to degradation rate. The introduction of Ce contributed to the nanopore structure and increased the specific surface area (302.58 m2/g), and effectively promoted the development of active surface oxygen and oxygen vacancies in the lattice, thus reducing the excited energy of photoelectron and expanding the spectral response range. Moreover, Ce acted as a medium to transfer photoelectrons, which successfully separates the reducing photoelectron in conduction band (CB) and the oxidized hole in valence band (VB), and generated·O2? and·OH with O2 and OH?, respectively. These active species attacked TC molecules adsorbed on CeTL surface, degraded them into small molecules, and improved the antibacterial activity of CeTL. The good adsorption capacity and the enhanced visible light catalysis of CeTL synergistic realized the efficient removal of TC. This work enriched the research system of comprehensive utilization of Ti-BFS, and provided a new strategy for the preparation of efficient applied photocatalysts and the recycling of resources.
NSTL
Elsevier
