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In this project, Sn-Fe bimetallic nanoparticles were prepared by a facile method. The bimetallic nanoparticles of it could be well established by a field emission scanning electron microscope micrographs. Due to the excellent synergistic influence between Sn-Fe nanoparticles and leucine indicated a great performance for determination of Cr 3+ . The material was characterized using the XRD, DLS, and zetasizer for theevaluation of crystal structure and morphologyinformation.The potential and effective size of Sn-Fe NPs was -29.10 mV and 30 nm, respectively. Cr 3+ ions interaction with the Sn-Fe NPs-leucine probe was carried out in 1 min as response time. The limit of detection of Sn-Fe NPs for Cr(III) colorimetric method was 0.25 nM. The prepared nanoparticles showed impressive photocatalysis efficiency for degradation of MO was about 95.1% in 35 min, thus the prepared nanoparticles may be developed for the detoxification of pollution. The prepared nanoparticles depicted effective antibacterial activity againstC. botulinum and, H. pylori bacteria., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2021 Elsevier B.V. All rights reserved.)

Air pollution is known as one of the most important causes of death in the whole world. Therefore, pollution reduction to achieve clean air was noticed by everyone. This way, using nanotechnology to control air and monitor is a novel approach. This paper investigates the effect of the number of graphene nano-pores on the SiO 2 separation from the H 2 O vapour in the presence of an external electric field with the magnitude of 0.01 V/Å using the molecular dynamics (MD) method. The electric field affects the charged particles and causes disturbance in the structure. It also prevents SiO 2 nanoparticles from passing through the graphene nanosheet. Also, the presence of carbon nanosheets acts as a membrane and affects the diffusion of water in the nanostructure. So, the results show that in the presence of a nano-pore, the number of H 2 O molecules reaches to 496 and 568 in reservoirs 2 and 3. Also, the number of SiO 2 nanoparticles reaches 10 and 4 in reservoirs 2 and 3. This shows that in reservoirs 2 and 3, about 80% and 60% of the SiO 2 nanoparticles are separated. As mentioned before, the electric field prevents the passage of SiO 2 nanoparticles through the graphene nanosheet. As the number of graphene nano-pores increases by 2, 3, 4, and 5, the number of passing water molecules increases. Considering that the number of graphene nano-pores has increased and the movement path of particles has increased, the number of passing particles almost increases. However, the electric field prevents the passage of SiO 2 nanoparticles. According to the results, the suggested setup can be employed for designing highly efficient nanostructured membranes for air purification and monitoring. [Display omitted] [ABSTRACT FROM AUTHOR]

• Glycerol-assisted self-template approach was utilized to prepare pyrite-phase of high-entropy transition-metal sulfides (CoFeNiMnCu)S 2 nanoparticles. • The (CoFeNiMnCu)S 2 nanoparticles exhibited a low overpotential of 284 mV with a low Tafel slope of 57 mV/dec in a 1.0 M KOH solution. • The superb electrochemical activity of quinary (CoFeNiMnCu)S 2 was preserved over 8 h OER reaction and long-term potential-cycling after 1000 CV cycles. • The electrocatalytic behavior of various samples toward OER pertinent to their specific electronic features and multi-metallic interaction were comprehensively discussed. Developing extremely efficient electrocatalysts for oxygen evolution reactions (OER) is a decisive step toward the progression of rechargeable metal-oxygen batteries, CO 2 reduction, and water-splitting. Nanoporous high-entropy transition-metal sulfides (np-HETMS) represent a new generation of promising OER catalysts by virtue of their exceptional catalytic activity. However, their synthesis maintains to be a challenge by reason of the thermodynamic immiscibility of the constituting multi-principal metallic elements in the sulfide structure. Herein, for the first time, the np-HETMS ((CoFeNiMnCu)S 2) nanoparticles with pyrite-phase was synthesized via a facile and easy adaptable glycerol-assisted self-template approach to resolve the immiscibility of multi-metallic constituents. The coordination of metal ions with polyalcohol in metal glycerate, as an intermediate template, is beneficial for achieving atomic blending of multiple metal ions in sulfides structure at HETMSs during the synthesis procedure. In reliance on the electronic and physicochemical traits, the electronic configuration of as-synthesized (CoFeNiMnCu)S 2 was elucidated by virtue of the comparison with its quaternary, ternary, and binary subsystems. The superior performance of np-HETMS (CoFeNiMnCu)S 2 nanoparticles, corresponding subsystems, and commercial RuO 2 catalyst are accentuated by integrating into a three-electrode configuration for OER reaction. The (CoFeNiMnCu)S 2 nanoparticles exhibited a trivial overpotential of 284 mV when the current density reached 10 mA/cm2 with a low Tafel slope of 57 mV/dec in a 1.0 M KOH solution. Besides providing a novel and highly active high-entropy-based electrocatalyst, this work inaugurates a new synthesis paradigm toward high-entropy metal alloys for extremely efficient electrocatalysis applications. [Display omitted] [ABSTRACT FROM AUTHOR]