Search

For efficient removal of the antibiotic-resistance bacteria and antibiotic-resistance genes, zirconium-doped zinc-aluminum layered double hydroxide/graphene oxide (Zn-Al-Zr LDHs/GO) nanocomposite has been developed. The Zn-Al-Zr LDHs/GO shows outstanding photocatalytic sterilization, inactivating kanamycin-resistance E. coli (6.53 log 10 CFU/mL) under the full-wavelength light irradiation within 50 minutes. Owing to the 1O 2 formation, it greatly disrupts the respiratory chain of the kanamycin-resistance E. coli, thereby leading to a declined yield of adenosine triphosphate, down-regulated expressions of the DNA ligase and polymerase proteins, as well as completely inhibited expressions of the DNA repair proteins. Meanwhile, the strong adsorption capability of the Zn-Al-Zr LDHs/GO towards phosphorus endows it with special nano-confinement effects for ARGs. It results in significantly enriched local concentration of the kanamycin-resistance genes on the Zn-Al-Zr LDHs/GO, consequently enhanced removal ability towards the kanamycin-resistance genes (4.70 log 10 copies/mL in 3 hours). This work provides a new strategy for effectively removing the ARB and ARGs. [Display omitted] • Zn-Al-Zr LDHs/GO binds e-ARGs through the nano-confinement effects. • Zn-Al-Zr LDHs/GO removes ARB with different concentrations in 60 min by photocatalytic. • ATP yield in ARB decreased and DNA replication was blocked by 1O 2. • Zn-Al-Zr LDHs/GO has stable material structure and photocatalytic activity. [ABSTRACT FROM AUTHOR]

Herein, a "chimney effect" formed on the interface between the metal oxide and nickel metal for the hydrogen evolution reaction is confirmed by using density functional theory calculations and experimental methods. • A "chimney effect" formed on the interface between the metal oxide and nickel metal for the hydrogen evolution reaction is found. • The "chimney effect" is a result of the interfacial charge transfer between the metal and metal oxide. • The chemical environment around interface makes the neighboring sites be immune to H 2 O* and OH* adsorption but tend to adsorb H* selectively. • The metal oxide/metal interface is beneficial for the smooth adsorption of H* and the easy desorption of H 2 from the catalyst surface. • Experiments further reveal the key role of the amount of chimney, i.e., the interfacial metal atoms, for the excellent HER activity. Precise atomic-level control of composition and geometric structure at the interface between two catalyst components can effectively tune the catalytic properties. Herein, we found a "chimney effect" formed on the interface between the metal oxide and Nickel metal for the hydrogen evolution reaction, using density functional theory calculations and experimental methods. This special chemical environment around the interface leads the neighboring sites to be immune to the H 2 O* and OH* adsorption and to only selectively adsorb H* properly. Meanwhile, it is also beneficial for the smooth adsorption of the reactant (H*) on the interface and the easy desorption of the product (H 2) from the catalyst surface (ΔG H* close to zero). This phenomenon appears similar to a chimney of hydrogen evolution around the metal oxide/metal interface. Such "chimney effect" is a result of the interfacial charge transfer between the metal and metal oxide, and should be the nature of the interface-induced synergistic effect in metal oxide/metal composite catalysts for HER. Experiments further confirm that the catalytic activity of metal oxide/metal composites for HER can be enhanced by increasing the amount of the chimney - the interfacial metal atoms. [ABSTRACT FROM AUTHOR]

Herein, we report a hydrogen peroxide-free resin photo-Fenton system with separation-free, low-cost, and strong mineralization ability of efficiently degrading organic pollutants (phenols, endocrine disruptors, antibiotics, and dyes). Based on the synergistic effect of hydroxyl radicals and holes, the corresponding degradation rate for Bisphenol A (BPA) was 11 times and 14.6 times higher than that of P-g-C 3 N 4 and CdS/rGO photo-self-Fenton, respectively. The excellent performance is mainly attributed to a nearly 100% reduction of iron ions by electrons and promoted hydrogen peroxide utilization of 82.1%. Meanwhile, the introduction of strong oxidizing holes (2.15 eV) prevented the generation of macromolecular polymer intermediates, leading to a directly aromatic ring-opening and high mineralization efficiency (67%). This work exhibits a promising role of resin in visible-light photo-self-Fenton systems, offering a new route for eco-friendly and efficient wastewater treatment. [Display omitted] • A semiconductive photocatalyst based metal-free resin photo-self-Fenton was successfully constructed. • Excellent photocatalytic performance and stability for BPA degradation. • The synergistic effect of hydroxyl radicals and holes greatly improves the mineralization efficiency. • Possible pathways and mechanism of photocatalytic degradation of BPA were proposed. [ABSTRACT FROM AUTHOR]