In order to solve the problem of maintaining acidic environment and continuous loss of iron ions in traditional homogeneous Fenton reaction, an advanced photocatalytic-Fenton coupling system was developed on the basis of 2D/2D S-scheme Fe2O3/Bi2WO6 and Fe2O3/Bi2MoO6 catalysts fabricated by a facile hydrothermal method. X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy analyses of the synthesized catalyst displayed that the hexagonal nanosheets of Fe2O3 were successfully deposited on Bi2WO6 and Bi2MoO6 nanosheets. Under visible light irradiation, the photo-Fenton catalytic activities of Fe2O3/Bi2WO6 and Fe2O3/Bi2MoO6 were significantly higher than those of individual components. By virtue of large surface area, adequate active sites and efficient charge transfer mechanism, the construction of 2D/2D Fe2O3/Bi2WO6 and Fe2O3/Bi2MoO6 heterojunction observably enhanced the separation efficiency of photogenerated carriers. Simultaneously, highly efficient charge mobility can lead to continuous Fe3+/Fe2+ conversion, promoting a cooperative effect between the photocatalysis and Fenton reaction. What’s more, a novel S-scheme model was proposed to expound the charge transfer process in the photo-Fenton catalytic reaction. We believe that Fe2O3/Bi2WO6 and Fe2O3/Bi2MoO6 composites can be a valuable guide for designing and constructing 2D/2D S-scheme heterojunction photo-Fenton catalysts.
Based on the power spectrum of the index fluctuation with the outer scale of seawater turbulence, we develop the channel capacity of oceanic turbulence links with carrier Bessel-Gaussian vortex localized wave. By this capacity model, we investigate the influences of seawater turbulence and carrier parameters on the channel capacity. The results show that higher rate of dissipation of kinetic energy per unit mass of fluid, larger inner scale, or lower dissipation rate of the meansquared temperature causes the higher channel capacity; the Bessel-Gaussian localized vortex wave with broader initial half-pulse width has stronger resistance to oceanic turbulent perturbation. This work provides a theoretical basis for realizing high capacity oceanic optical communication with carrier Bessel-Gaussian vortex localized wave.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.