Photocatalytic degradation of oxytetracycline under visible light by nanohybrids of CoFe alloy nanoparticles and nitrogen-/sulfur-codoped mesoporous carbon

Multiple cobalt active sites evenly embedded in mesoporous carbon nanospheres derived from a polymer-metal-organic framework: efficient removal and photodegradation of malachite green

“…Subsequently, photogenerated electrons can rapidly migrate to porous carbon layer, greatly improving the separation efficiency of photogenerated charge carriers. Given that the CB of Co/Co x O y @mC 600 located at −0.75 V ( vs. NHE) is more negative than E 0 (O 2 /˙O 2 − ) (−0.33 V vs. NHE), 63 the dissolved O 2 in solution and O 2 on the Co/Co x O y @mC 600 catalyst surface can be reduced by photogenerated electrons to yield ˙O 2 − (eqn (8)). Moreover, considering that the VB of Co/Co x O y @mC 600 (2.16 V vs. NHE) is more positive than H 2 O/˙OH (1.99 V vs. NHE), H 2 O could react with holes, thereby producing ˙OH 64 (eqn (9)).…”

Mechanism insight into the photocatalytic degradation of fluoroquinolone antibiotics by the ZIF-8@Bi2MoO6 heterojunction

“…62 Moreover, with the large surface area and rich pore channels of BIZ, it is possible to facilitate the adsorption and diffusion of OFX molecules, leading to the rapid photocatalytic degradation of OFX. 63 In brief, the porous structure of ZIF-8 in BIZ greatly improves the charge separation during photocatalysis, enhances the adsorption of reactants on its surface, provides a large number of active sites, and thus accelerates the photocatalytic reaction. 64,65…”

“…62 Moreover, with the large surface area and rich pore channels of BIZ, it is possible to facilitate the adsorption and diffusion of OFX molecules, leading to the rapid photocatalytic degradation of OFX. 63 In brief, the porous structure of ZIF-8 in BIZ greatly improves the charge separation during photocatalysis, enhances the adsorption of reactants on its surface, provides a large number of active sites, and thus accelerates the photocatalytic reaction. 64,65 When combining Na 2 S 2 O 8 and visible light, the OFX treatment efficiency of the BIZ material increased from 26.36% to 96.36%, indicating the significant role of Na 2 S 2 O 8 in the photocatalytic degradation of OFX under visible light conditions via the formation of ROS (e.g., sulfate, hydroxyl, and superoxide radicals).…”

Interfacial engineering of a tri-phase CoFe/CoFeOx/Co–Fe3O4electrocatalyst for promoting the oxygen evolution reaction

“…In particular, a pair of peaks at 711.3 eV and 724.0 eV was ascribed to divalent Fe 2+ 2p 3/2 and, Fe 2+ 2p 1/2 , a pair of peaks at 713.0 eV and 726.1 eV was attributed to trivalent Fe 3+ 2p 3/2 and 2p 1/2 , while another pair of peaks at 710.0 eV and 719.4 eV was associated with zero-valent Fe 0 , with a pair of satellite peaks locating at 716.1 eV and 733.2 eV accompanied. 32,33 For O 1s (Fig. 3c), three characteristic peaks at 529.7 eV, 530.5 eV and 532.4 eV were divided into three categories, corresponding to the metal–oxygen bond, oxygen defects and the hydroxyl group.…”