A simple and time-saving method of electrodeposition was found to fabricate the superhydrophobic Zinc surface on the steel substrate. The surface morphologies and chemical compositions were characterized by using scanning electron microscope, Fourier transform infrared spectrometry and X-ray photoelectron spectroscopy. The results show that the as-prepared surfaces form micro/nano rough structures evolved from the as-prepared surfaces which have been modified by stearic acid, and exhibit good superhydrophobicity with a water contact angle of 157.2° as well as a sliding angle of 5.2°. Interestingly, the superhydrophobic Zinc surface can realize an effective reversible switching between superhydrophobicity and superhydrophilicity after being annealed and modified alternatively, with a fast the wetting switching process costing only 16 min for each cycle. Moreover, polarization curves measurements demonstrate that the superhydrophobic Zinc surface has good anticorrosion properties that can provide greater protection for the bare steel substrate. It is believed that an effective, rapid and eco-friendly approach has been invented to prepare large-area superhydrophobic surface, which shows reversible wettability switching and anticorrosion on the steel substrate for great potential applications, and easily extended to other metal substrates.
Background:
TiO2 nanoparticles possess adsorption capacity and photocatalytic activity, and are thus fitted for removal of dyes from water. However, TiO2 nanoparticles are difficult to separate from the bulk solution due to high loss. Moreover, TiO2 can only use light with wavelength less than 387.5 nm as, so the utilization efficiency of solar energy is very low. The present work prepared Fe3O4@C@TiO2-AgBr-Ag composites to overcome the shortcomings of TiO2.
Objective:
Adsorptive and photocatalytic performance of nano-magnetic materials Fe3O4@C@TiO2-AgBr-Ag.
Methods:
Fe3O4@C@TiO2 and Fe3O4@C@TiO2-AgBr-Ag magnetic nanocomposites were prepared by sol-gel method. Their structure was characterized. Performances of Fe3O4@C@TiO2 and Fe3O4@C@TiO2-AgBr-Ag for removing Rh B Fe3O4/C NPs were thoroughly investigated and compared. Langmuir–Hinshelwood kinetic model was applied to analyze the heterogeneous processes of adsorption and photodegradation.
Results:
Removal experiments were carried out with Rhodamine B as subject. The effects of contacting time, pH, subject concentration, and doses of photocatalyst on the removal performance were studied. The removal of Rh B by Fe3O4@C@TiO2 and Fe3O4@C@TiO2-AgBr-Ag involved both adsorption and photodegradation, and the photocatalytic activity of Fe3O4@C@TiO2-AgBr-Ag was much higher than that of Fe3O4@C@TiO2. The optimum removal conditions were determined. Under the optimal conditions, the removal rate of Rhodamine B with Fe3O4@C@TiO2 was 77.8%, and the removal rate of Rhodamine B with Fe3O4@C@TiO2- AgBr-Ag was 87.3%.
Conclusion:
The coupling of the nanostructured metal Ag to the outer surface of TiO2 could effectively increase photocatalytic efficiency under visible light. The photocatalysts could be separated from bulk solutions by using a magnet and be easily recycled. The removal reaction kinetics fitted with first-order model.
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