A green synthesis method for producing zinc oxide nanoparticles (ZnO NPs) was presented using natural Gum Arabic (GA) as a natural stabilizing agent. For the first time, the as-synthesized ZnO NPs were employed to photodegrade the toxic Congo Red (CR) dye in an aqueous solution. The structural and morphological characterizations confirmed the successful synthesis of ZnO NPs. The ZnO NPs possessed an average crystallite size of 42.7 nm. In addition, it was found that a concentration of 20 mg L⁻¹ of CR dye yielded the most favorable photodegradation results, and 4 mg mL⁻¹ of the photocatalyst was the optimal amount. The results showed a maximum degradation percentage of 99.5% at pH 8 after 30 min of irradiation. This indicates that the as-synthesized ZnO NPs have remarkable photocatalytic properties. Moreover, the study demonstrated the suitability of the pseudo-first-order kinetic model for representing the photodegradation process through kinetic studies of the photocatalyst process of CR dye by ZnO NPs using the Langmuir-Hinshelwood (L-H) model.

Nanoparticles of tungsten oxide (WO₃) and zinc oxide (ZnO) enriched polyethylene sebacate (PES) nanocomposites were prepared through the coprecipitation process and condensation polymerization reaction. The obtained nano-sized particles of WO₃ and ZnO, PES, and nanocomposites (WO₃-PES NC and ZnO-PES NC) were investigated. The average molecular weight of the cured PES was measured by employing the gel permeation chromatography (GPC) technique. Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) spectra assured the formation of the polymeric nanocomposites.WO₃ and ZnO nanoparticles supposed a condensed porous spherical phase found implanted in the polymer structure, as detected by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) methods. These nano-scale systems achieved an electrical activity based on the conductive nanoparticles embedded matrix as a result of the ion–ion interactions. The microbial influence of the nanocomposites was examined against pathogenic bacteria; Pseudomonas aeruginosa,Escherichia coli, Staphylococcus aureus, and Bacillus subtilis, and Fungi; Aspergillus niger, and Candidaalbicans. Results exhibited that these nanocomposites have antimicrobial effects from moderate to slightly high on bacteria and high on fungi which was confirmed by a clear zone of inhibition. This study contributes to the design of reasonable composites to be under evaluation for their catalytic effect.

Although metal single atom catalysts (SAC) have been demonstrated to be effective in heterogeneous catalysis, establishing a scalable and cost-effective SAC support system remains an important challenge. Here, innovative ways to create materials that are entirely distinct from their parent characteristics for wastewater treatment and environmental challenges are proposed. Series of different molar ratio of Ag (0.01, 0.02, 0.03 and 0.04 wt%) were assigned to prepare Ag@CPAN composite and observe its impact application on photocatalytic degradation of 4-nitrophenol (4-NP) assisted by peroxymonosulfate (PMS) under visible light irradiation. The morphology and composition of the synthesized Ag@CPAN was characterized using a range of techniques. Several parameters were investigated that could influence degradation efficiency, including PMS concentration, solution pH, catalyst dosage, and initial 4-NP concentration. Under visible light irradiation, Ag@CPAN shows excellent photocatalytic performance of 4-NP, methylene blue, methyl red and RhB degradation. Ag@CPAN elucidates excellent catalytic performance while maintaining high stability up to 6 successive cycles and this backwards to synergistically effect between CPAN and Ag. Furthermore, provides an easy way to prepare a variety of SAC, and it is easily scalable with significant potential in catalytic applications.