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Tricobalt tetraoxide (CoO), a spinel-structured nanoparticle which possesses mixed oxidation states, has been synthesized via a Punica granatum (P. granatum, pomegranate) seed extract-mediated green reaction and has been investigated for its superior catalytic activity in three applications, which include (i) photodegradation of textile dye effluents (TDE) collected from the dyeing industry, Tiruppur, Tamil Nadu, India, (ii) catalytic hydrogenation of nitro-aromatic pollutants such as 4-nitrophenol and 4-nitroaniline, and (iii) antibacterial potential in biomedical applications. Prior to the application studies, the synthesized CoO spinel nanoparticles (CoO-NPs) were characterized by well-known established techniques such as X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), energy dispersive X-ray analysis (EDX), diffuse reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL), and Raman and FT-IR spectroscopies. We have also discussed the probable mechanism and kinetic studies of the catalytic activity of the CoO-NPs. Finally, we concluded that the design and development of novel, economic and green synthesis-mediated catalysts such as CoO-NPs can exhibit efficient catalytic activity in diverse fields, which is necessary for environmental remediation.

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We study both analytically and numerically disorder-induced localization of light in random-layered structures with magneto-optical materials. The Anderson localization in such structures demonstrates nonreciprocal features in the averaged localization length and individual transmission resonances. We employ the short-wavelength approximation where the localization effects are strong and consider both the Faraday and Voigt magneto-optical geometries. In the Faraday geometry, the transmission is strongly nonreciprocal for the circularly polarized waves, whereas in the Voigt geometry, the nonreciprocity is much weaker and it may appear only for the individual transmission resonances of the TM-polarized waves.