Sustainable Approach for Synthesis of Ternary Composite Based on Zinc Metal-Organic Framework and Its Boosting Performance for Supercapacitor Applications Sally M. Youssry, Abeer S. Elsherbiny, Ali. H. Gemaey Journal of Inorganic and Organometallic Polymers and Materials, 2025 The integration of metal-organic frameworks (MOFs) and carbon materials boosts the electrochemical performance of supercapacitor (SC) electrodes. Hereby a facile and inexpensive method for synthesizing new hybrid supercapacitor electrode materials, zinc metal framework/reduced graphene oxide (Zn-MOF/rGO), zinc metal framework/polypyrrole (Zn-MOF/PPy) and zinc metal framework/polypyrrole/reduced graphene oxide (Zn-MOF/PPy/rGO) composites were performed. Surface and morphological properties of the four composites were conducted using different tools. The synthesized composites were then loaded onto a nickel foam (NF) substrate for supercapacitor electrochemical tests. The produced Zn-MOF/PPy/rGO nanocomposite loaded on NF electrode materials demonstrated improved electrochemical efficiency, with a high specific capacitance of 500.7 Fg− 1 at a scan rate of 3 Ag− 1. Moreover, a capacitance retention of 78.5%, and outstanding cyclic stability over 5000 cycles in the three-electrode setup with 1 M KOH electrolyte was observed. The improved electrochemical behavior of Zn-MOF/PPy/rGO nanocomposite loaded on NF electrode materials for SCs, as well as its fast and simple synthesis process, give a suitable and rapid way to synthesize other types of metal-organic frameworks nanocomposite electrodes for various energy storage devices.
Carbon-dot-loaded CoxNi1−xFe2O4; x = 0.9/SiO2/TiO2 nanocomposite with enhanced photocatalytic and antimicrobial potential: An engineered nanocomposite for wastewater treatment M. Abd Elkodous, Gharieb S. El-Sayyad, Sally M. Youssry, Hanady G. Nada, Mohamed Gobara, et al. Scientific Reports, 2020 Water scarcity is now a serious global issue resulting from population growth, water decrease, and pollution. Traditional wastewater treatment plants are insufficient and cannot meet the basic standards of water quality at reasonable cost or processing time. In this paper we report the preparation, characterization and multiple applications of an efficient photocatalytic nanocomposite (CoxNi1−xFe2O4; x = 0.9/SiO2/TiO2/C-dots) synthesized by a layer-by-layer method. Then, the photocatalytic capabilities of the synthesized nanocomposite were extensively-studied against aqueous solutions of chloramine-T trihydrate. In addition, reaction kinetics, degradation mechanism and various parameters affecting the photocatalytic efficiency (nanocomposite dose, chloramine-T initial concentration, and reaction pH) were analyzed in detail. Further, the antimicrobial activities of the prepared nanocomposite were tested and the effect of UV-activation on the antimicrobial abilities of the prepared nanocomposite was analyzed. Finally, a comparison between the antimicrobial abilities of the current nanocomposite and our previously-reported nanocomposite (CoxNi1−xFe2O4; x = 0.9/SiO2/TiO2) had been carried out. Our results revealed that the prepared nanocomposite possessed a high degree of crystallinity, confirmed by XRD, while UV–Vis. recorded an absorption peak at 299 nm. In addition, the prepared nanocomposite possessed BET-surface area of (28.29 ± 0.19 m2/g) with narrow pore size distribution. Moreover, it had semi-spherical morphology, high-purity and an average particle size of (19.0 nm). The photocatalytic degradation efficiency was inversely-proportional to chloramine-T initial concentration and directly proportional to the photocatalyst dose. In addition, basic medium (pH 9) was the best suited for chloramine-T degradation. Moreover, UV-irradiation improved the antimicrobial abilities of the prepared nanocomposite against E. coli, B. cereus, and C. tropicalis after 60 min. The observed antimicrobial abilities (high ZOI, low MIC and more efficient antibiofilm capabilities) were unique compared to our previously-reported nanocomposite. Our work offers significant insights into more efficient water treatment and fosters the ongoing efforts looking at how pollutants degrade the water supply and the disinfection of water-borne pathogenic microorganisms.
