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TiOF2/TiO2 composite nanosheets: Effect of hydrothermal synthesis temperature on physicochemical properties and photocatalytic activity
摘要： TiOF 2 /TiO 2 nanosheets were prepared by hydrothermal processing of Ti(OBu) 4 in the presence of aqueous HF solution. The effect of different hydrothermal synthesis temperatures (140, 160, 180, and 200 °C) on the compositions, morphologies, crystal sizes, and photoelectric properties of the resulting samples was studied via various characterization methods. The photocatalytic properties of the samples were studied through photodegradation of organic pollutants such as rhodamine B (RhB), methyl orange (MO), and cipro?oxacin hydrochloride (CIP-HCl). TiOF 2 /TiO 2 nanosheets prepared by hydrothermal synthesis at 160 °C exhibited the highest photocatalytic activity among these samples, and it is much more active than P25 (a benchmark photocatalyst) and TiO 2 prepared hydrothermally (without adding aqueous HF solution during the hydrothermal synthesis). A possible photocatalytic mechanism is discussed.
关键词： Nanosheet,TiO 2,Photocatalyst,TiOF 2,Degradation
更新于2025-09-23 15:21:21
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Synthesis of Na-, Fe-, and Co-promoted TiO$_{2}$/multiwalled carbon nanotube composites and their use as a photocatalyst
摘要： The use of multiwalled carbon nanotubes (CNTs) in sol-gel synthesized titanium dioxide (TiO 2) photocatalysts as templates was systematically studied. CNTs have high oxidative thermal stability and the controlled removal of CNTs can be achieved at lower temperatures under air (cid:13)ow by the use of Na, Fe, and Co as a catalyst. These catalysts helped to reduce the oxidation temperature of CNTs; thus anatase phase was achieved without signi(cid:12)cant sintering. The use of a promoter, heat treatment, and various heat treatment atmospheres was e?ective in speci(cid:12)c surface area, crystallinity, and photocatalytic activity against methylene blue (MB) degradation. While the speci(cid:12)c surface area of bare TiO 2 was 22 m 2 /g, after templating surface areas as high as 191 m 2 /g were obtained. For the photocatalytic characterization, with bare TiO 2 , the rate constant for MB decomposition was 0.81 h (cid:0)1 , and for CNT{TiO 2 it was 1.31 h (cid:0)1 . Moreover, after Na promotion, the rate constant increased to 1.85 h (cid:0)1 . The results showed that CNTs can be used as a template to tailor and improve the textural properties. Moreover, as a novel material, the Na promotion in CNT{TiO 2 samples showed the best photocatalytic activity by enhancing the interaction between TiO 2 and CNT surfaces.
关键词： anatase,Carbon nanotubes,TiO 2,doping,sol-gel,template,photocatalysis,composite
更新于2025-09-16 10:30:52