Search

[Display omitted] • Single atom Co-anchored nitrogen‑doped graphene was developed for PMS activation. • 1O 2 generation was boosted in PMS activation and dominant for pollutant degradation. • The acute toxicity of pollutants was effectively reduced in PMS activation. • Developed catalyst exhibited remarkable cycling stability and negligible leaching. Singlet oxygen (1O 2) is an excellent active species generated in advanced oxidation processes (AOPs) that exhibits high selectivity, long life and wide pH tolerance. Therefore, catalysts for highly efficient and selective generation of 1O 2 in AOPs would be highly desirable. This study developed a single atom Co-anchored nitrogen‑doped graphene (Co SAC -NG), which showed excellent catalytic performance for peroxymonosulfate (PMS) activation and bisphenol A degradation, with the pseudofirst-order reaction rate constant improved from 8.13 × 10−4 min−1 without catalyst to 4.42 × 10−2 min−1 with 5 mg L−1 Co SAC -NG. Mechanism studies indicated that Co SAC -NG selectively enhanced 1O 2 generation, which was the dominant active specie for pollutant degradation. Moreover, the Co SAC -NG/PMS system effectively reduced the acute toxicity of pollutant, and Co SAC -NG exhibited remarkable cycling stability and negligible leaching. This study develops a new catalyst with high selectivity for 1O 2 generation and provides a reference for application of single atom catalyst in PMS-based AOPs. [ABSTRACT FROM AUTHOR]

White light-emitting diodes have been intensively explored as a technique of green energy-conversion in recent decades. In this work, a unique Tb3+/Sm3+ co-doped P 2 O 5 –Gd 2 O 3 –Ga 2 O 3 –NaF–ZnO glass consisting of Q 0, Q 1 and Q 2 units was successfully synthesized. The DSC curves demonstrated that the glass stability gradually deteriorated with the increase of Sm3+ contents. The emission spectra exhibited the energy transfer from Dy3+ to Tb3+ ions, and the energy transfer efficiency and probability grew monotonously with the increase of Sm3+ contents. With the help of temperature-dependent emission spectra, the glasses were validated to be thermally stable. The fluorescence curves and Inokuti-Hirayama model demonstrated that the dominant mechanism in the energy transfer process was electric dipole-quadrupole interaction. In addition. the white-light emission with suitable chromaticity coordinates and CCTs could be obtained by adjusting the contents of the sensitizer and activator for PGGNZ glasses. All investigations revealed the potential application of Tb3+/Sm3+ co-doped glasses in optical device applications. • A novel Tb3+/Sm3+-doped phosphate glass for white light emission has been prepared. • The glass has high thermal stability (84.1% of the initial intensity at 150 °C). • Energy transfer via dipole-dipole interaction leads to concentration quenching. • This glass has tunable CCT, fluorescence lifetimes, and chromaticity coordinates. • These glasses have potential applications in display devices and W-LED lighting. [ABSTRACT FROM AUTHOR]

Photocatalytic hydrogen peroxide (H 2 O 2) by oxygen and phosphorus co-doped graphitic carbon nitride (C 3 N 4) with cobalt phosphate (CoP) cocatalyst is investigated. The photocatalyst powder of CoP-C 3 N 4 1:n, n = 0–4, n is the weight ratio of cyanuric acid added) was synthesized by melamine cyanurate template method. Characterization of the catalyst was performed by X-ray diffraction analysis, and scanning electron microscopy, X-ray photoemission spectra, and fluorescence decay spectra. Oxygen doping was performed by the melamine and cyanuric acid template method, followed by phosphorus doping of the C 3 N 4 backbone by the introduction of CoP. Co-doping of O and P atom facilitated charge transfer on the C 3 N 4 backbone, while CoP facilitated charge separation at the C 3 N 4 interface. The CoP-C 3 N 4 (1:4) photocatalyst increased H 2 O 2 production rate by 293 % compared to that of the cyanuric acid-free photocatalyst and also achieved the photocatalytic oxygen evolution from water. These results indicate that O,P co-doped CoP-C 3 N 4 can perform sacrificial agent-free hydrogen peroxide under visible light irradiation. [Display omitted] • O,P-co-doped CoP-C 3 N 4 increased H 2 O 2 production is investigated first time. • The addition of cyanuric acid promoted the doping of phosphorus into C 3 N 4 structure. • Hydrogen peroxide synthesis under sacrificial agent-free and visible light. • The O,P-co-doped CoP-C 3 N 4 increased H 2 O 2 production rate as high as 293 %. [ABSTRACT FROM AUTHOR]

This paper aims to provide an insight into the effects of different doping ratios on the crystal structure, thermal conductivity, ion diffusion, and high-temperature thermal expansion coefficient of Sc 2 O 3 -Gd 2 O 3 -Y 2 O 3 co-doped ZrO 2 (ScGdYSZ) materials. They were investigated by a non-equilibrium molecular dynamics method. The results show that with Gd 2 O 3 -Sc 2 O 3 -Y 2 O 3 co-doping, the thermal expansion of the resulting materials is all relatively close to that of 8YSZ materials and linear with temperature. At 1473 K, 1 mol%Sc 2 O 3 –3 mol%Gd 2 O 3 –4 mol%Y 2 O 3 stabilized ZrO 2 (1Sc3Gd4YSZ) coating material has the smallest thermal conductivity, with a thermal conductivity of 5.66 W·(m·K)−1. The mean square displacement (MSD) of O2− was linear with the time when the sum of the doping ratio of Sc 2 O 3 and Gd 2 O 3 was 4 mol%, and the MSD of O2− in the material increased with the doping ratio of Sc 2 O 3. increases, the MSD of O2− in the material increases, and the migration diffusion rate is accelerated. • we conducted an in-depth study of the effects of different doping ratios on the microstructure and thermal transport of this material by non-equilibrium molecular dynamics simulations. • Co-doping of Gd 2 O 3 , Sc 2 O 3 , and Y 2 O 3 has no effect on the microstructure of thermal barrier coating materials, whereas doping of Gd 2 O 3 and Sc 2 O 3 weakens and strengthens the materials' stability of crystal structure, respectively. • Gd 2 O 3 , Sc 2 O 3 and Y 2 O 3 were co-doped, were co-doped, and the thermal expansion of the resulting materials was all relatively close to that of the 8YSZ material and linear with temperature. • At 1473 K, when the doping ratio of Sc 2 O 3 and Gd 2 O 3 is summed to 4 mol%, the MSD of O2− is linearly related to the system movement time, and the migration diffusion rate is accelerated as the MSD of O2− in the material increases with the larger Sc 2 O 3 doping ratio. [ABSTRACT FROM AUTHOR]

The development of highly efficient and stable anode electrocatalysts is highly demanding and challenging in seawater electrocatalysis for industrial application. Herein, we have constructed C, N co-doped mesoporous Co-based hybrid phosphates via a facile glucose-mediated regulation. The optimal C4-2-0.5Glu-550 by calcination at a mild temperature exhibits superior OER performance in 1.0 M KOH seawater with an overpotential of 296 mV at 10 mA cm−2 and a Tafel slope of 109 mV dec−1 as well as long-term stability (for at least 19 h). Combined with structural characterization, its excellent electrocatalytic performance should be attributed that the proper heteroatom doping regulates its electronic structure, correspondingly, adjusts the adsorption strength of the intermediates, in addition, its open porous structure increases exposed active sites and facilitates the electrons/mass transfer and the adsorption of reactants, above all, the carbon layer formed by the introduction of glucose significantly improves its corrosion resistance, further enhancing its performance in alkaline realistic seawater. [Display omitted] [ABSTRACT FROM AUTHOR]

Hydrosulfuric acid is an aqueous solution of hydrogen sulfide (H 2 S). At physiological pH, approximately 80% of the total amount of H 2 S exists in the form of monoanionic HS−. Because HS− is both widely distributed and highly toxic to humans, it is necessary to design an efficient method to detect HS− with high sensitivity and selectivity. So, the nitrogen-doped carbon dots (NCDs) with green fluorescence are synthesized using a one-step hydrothermal method. The as-prepared NCDs show it can be effectively used as an indicator for monitoring HS−. And the NCD fluorescence intensity exhibits a linear relationship with HS− concentration. In addition, NCDs as a probe can be applied for fluorescence imaging in living cells to detect the presence of trace exogenous HS−. [Display omitted] • NCDs with green fluorescent were synthesized hydrothermally using one step hydrothermal method. • NCDs exhibit good sensitivity and selectivity for HS−. • The detection concentration range of NCDs-based probe was 0–55 μM with a detection limit of 48.87 nM. • Low toxicity of NCDs can successfully detect intracellular HS−. [ABSTRACT FROM AUTHOR]