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In response to the present epidemic situation, this work proposes an anti-coronavirus composite polymer coating with nano-Ag2MoO4 as the core component to reduce the potential safety hazards caused by excessive use of disinfectants. Nano-β-Ag2MoO4 with mixed morphology was produced with industrialized preparation technology. Among them, oval nanoparticles are core components with antiviral properties, and long rod-shaped particles are used to identify whether the stirring process meets the standard. After x-ray diffraction and field emission scanning electron microscopy testing, nano-β-Ag2MoO4 stored for 4 years still meets the design requirements in terms of purity, crystal phase, shape, and scale, which solves the problem of the long-term effect of core components. In the existing water-based paint production process, the mixing process and formula of nano-β-Ag2MoO4 were explored, and the large-scale production process of anti-virus water-based paint was solved. Resistance tests against the HCoV-229E coronavirus showed that the anti-coronavirus activity rate of the nano-β-Ag2MoO4 coating at a weight concentration of 200 ppm was 99.5% within 2 h, which verified the effectiveness of the composite polymer coating.

In the last few decades, nanoparticles have been a prominent topic in various fields, particularly in agriculture, due to their unique physicochemical properties. Herein, molybdenum copper lindgrenite Cu3(MoO4)2(OH)2 (CM) nanoflakes (NFs) are synthesized by a one-step reaction involving α-MoO3 and CuCO3⋅Cu(OH)2⋅xH2O solution at low temperature for large scale industrial production and developed as an effective antifungal agent for the oilseed rape. This synthetic method demonstrates great potential for industrial applications. Infrared spectroscopy and X-ray diffraction (XRD) results reveal that CM samples exhibit a pure monoclinic structure. TG and DSC results show the thermal stable properties. It can undergo a phase transition form copper molybdate (Cu3Mo2O9) at about 300 °C. Then Cu3Mo2O9 nanoparticles decompose into at CuO and MoO3 at 791 °C. The morphology of CM powder is mainly composed of uniformly distributed parallelogram-shaped nanoflakes with an average thickness of about 30 nm. Moreover, the binding energy of CM NFs is measured to be 2.8 eV. To assess the antifungal properties of these materials, both laboratory and outdoor experiments are conducted. In the pour plate test, the minimum inhibitory concentration (MIC) of CM NFs against Sclerotinia sclerotiorum (S. sclerotiorum) is determined to be 100 ppm, and the zone of inhibiting S. sclerotiorum is 14 mm. When the concentration is above 100 nm, the change rate of the hyphae circle slows down a little and begins to decrease until to 200 ppm. According to the aforementioned findings, the antifungal effects of a nano CM NFs solution are assessed at different concentrations (0 ppm (clear water), 40 ppm, and 80 ppm) on the growth of oilseed rape in an outdoor setting. The results indicate that the application of CM NFs led to significant inhibition of S. sclerotiorum. Specifically, when the nano CM solution was sprayed once at the initial flowering stage at a concentration of 80 ppm, S. sclerotiorum growth was inhibited by approximately 34%. Similarly, when the solution was sprayed once at the initial flowering stage and once at the rape pod stage, using a concentration of 40 ppm, a similar level of inhibition was achieved. These outcomes show that CM NFs possess the ability to bind with more metal ions due to their larger specific surface area. Additionally, their semiconductor physical properties enable the generation of reactive oxygen species (ROS). Therefore, CM NFs hold great potential for widespread application in antifungal products. [ABSTRACT FROM AUTHOR]

ZnMoO4 nanoparticles with two different morphologies were successfully synthesized by the industrial dry method. Both nano-ZnMoO4 belong to α crystalline phase, and the valence state of Mo was verified to be + 6. The polyhedral-shaped particles and a mixture of polyhedral and rod-shaped particles exists, respectively. The average size of ZnMoO4 nanoparticles with polyhedral structure was 50 nm in diameter, while the diameter of the cross-section of ZnMoO4 nanoparticles (NPs) with rod-like structure was less than 50 nm. To evaluate the antibacterial properties of two materials, the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of two kinds of nano-ZnMoO4 against staphylococcus aureus were determined using an agar medium. The results showed that the MIC and MBC values of polyhedral nano-ZnMoO4 were 20 ppm and 40 ppm; the MIC and MBC values of rod-shaped and polyhedral hybrid nano-ZnMoO4 were 10 ppm and 20 ppm, respectively. The antibacterial effect of both nanoparticles was better than that of conventional ZnMoO4 with the size above 1 µm at the concentration of 200 ppm. This confirms the crystalline structure in relation to the crystal size/morphology and the concentration of powder in suspension can influence on the antibacterial efficiency. Furthermore, these two shaped nano-ZnMoO4 samples had different atomic percentages, so different spatial hinge structures were the important reason for the unequal antibacterial performance of these shaped nano-ZnMoO4 powder. [ABSTRACT FROM AUTHOR]