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•AgGO with enhanced absorption in the visible spectrum through a single-step surfactant-free facile method was prepared.•WO3-x/AgrGO composite with better photocatalytic activity was ...prepared by doping WO3-x by AgGO via a hydrothermal process.•Better carrier separation and reduced impedance leading to RhB degradation and bacterial inactivation.•It exhibits versatilities for photocatalytic activities in visible regions.•Stability tests suggest its excellent reusability.
Suppressing charge recombination in semiconductors via triggering interfacial polarization and synergism provides an effective way to redeem multifunctionality and achieve environmental sustainability. Herein, we anchor a single-step facile synthesis of AgGO, providing bandgap control through varying oxidation time and subsequent simultaneous incorporation of Ag and rGO via the in situ hydrothermal method in WO3-x. The resulting WO3-x/AgrGO composite demonstrated a broadening of optical absorption and excellent suppression of carrier recombination, thereby improving the catalytic properties. The synergism and excellent conductivity of AgrGO enhance the interfacial polarization to store the carriers for longer times and help carriers carry most of their energy to the catalyst’s surface. When WO3-x/AgrGO was tested against RhB under visible light irradiation, its degradation constant reached 0.034/min, 7.4 times faster than pure WO3-x. It has left no viable bacteria during the photoinactivation of gram-negative E. coli bacteria, and even its inactivation rate is 1.07 times faster than AgGO. So, this study provides a direct method of metal-GO composite synthesis and subsequent introduction into WO3-x to broaden the versatility of environmental semiconductors.
Different concentrations of zirconium with a fixed quantity (4 wt%) of chitosan (CS) doped nickel cobaltite (NiCo2O4) nanorods were synthesized using a co-precipitation approach. This cutting-edge ...research explores the cooperative effect of Zr-doped CS-NiCo2O4 to degrade the Eriochrome black T (EBT) and investigates potent antibacterial activity against Staphylococcus aureus (S. aureus). Advanced characterization techniques were conducted to analyze structural textures, morphological analysis, and optical characteristics of synthesized materials. XRD pattern unveiled the spinal cubic structure of NiCo2O4, incorporating Zr and CS peak shifted to a lower 2θ value. UV–Vis spectroscopy revealed the absorption range increased with CS and the same trend was observed upon Zr, showing a decrease in bandgap energy (Eg) from 2.55 to 2.4 eV. The optimal photocatalytic efficacy of doped NiCo2O4 within the basic medium was around 96.26 %, and bactericidal efficacy was examined against S. aureus, revealing a remarkable inhibition zone (5.95 mm).
•To synthesis the cerium oxide nanoparticles using different sources.•Biomedical applications of cerium oxide nanoparticles.•Applications of cerium oxide nanoparticles in toxicity studies.
A cerium ...oxide nanoparticles (nanoceria) has a wide range of applications in different fields, especially biomedical division. As a matter of concern, it has a major impact on the human health and environment. The aim of this review is to address the different ways of synthesis of nanoceria using chemical and green synthesis methods and characterization and the applications of nanoceria for antioxidant, anticancer, antibacterial activities and toxicological studies including the most recent studies carried out in vivo and in vitro to study the problems. We have exclusively discussed on the toxicology of nanoceria exposed to the general public along with recent advances in the studies of antimicrobial, toxicity and anti-oxidant activity.
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•The carbon/cerium oxide composites were prepared with the assistance of the glucose-based surfactant and impregnated to Fabrics.•The resultant CeO2–C composites exhibited excellent ...antibacterial activity.•The nanocomposites demonstrate efficient sunlight-driven photocatalytic activity.•The nanocomposites results in a synergistic effect, enhancing both antibacterial and photocatalytic performances.•The developed textiles hold promise for various healthcare applications.
This work inspects the antibacterial activity and sunlight-driven photocatalytic activity effect of nanocomposites of CeO2 and carbon as a surface coating onto the fabric with self-cleaning properties. The nanocomposites of CeO2 and carbon were confirmed by XRD, FTIR, Laser Raman and TEM, revealing the amorphous nature of carbon and the crystallographic structure of CeO2 nanoparticles. TEM depicted a sheet-like structure of carbon and orbicular morphology of CeO2. The nanocomposite was impregnated onto fabrics using an immersion and ultrasonication method. The fabrics impregnated with nanocomposites exposed a clear zone of inhibition of E. Coli and S.aureus bacterial strains, indicating potent bactericidal properties. The nanocomposite-impregnated fabrics show efficient and strong photocatalytic activity against P-Rosaniline Hydrochloride (PRH) dye, which was investigated at different concentrations of dye, repeatability, and reusability with time. The notable photocatalytic activity of the fabrics underscores their potential for use in anti-infection applications.
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•Preparation of graphene (G) nanosheets up to the kg scale from waste electronic.•Preparation of binary Nb2O5@G and Ag@G nanocomposite-based photocatalysts.•The as-synthesized ...photocatalysts were used for degradation of doxycycline antibiotics.•Nb2O5@G photocatalyst showed high degradation (98.5%) for doxycycline in 120 min under visible light.•In addition, these nanocomposites showed good potential against E. coli bacterial strains.
Herein, we report the successful preparation of high-quality graphene (G) nanosheets up to the kg scale using an electrochemical technique using graphite rods from scrap dry cell batteries. The as-prepared graphene was then decorated in-stiu with niobium oxide (Nb2O5) and silver (Ag) nanoparticles to prepare Nb2O5@G and Ag@G nanocomposites. Powdered X-ray diffraction (p-XRD), Fourier-transform (FT-IR) infrared spectroscopy, UV–visible (UV–vis) spectroscopy, Raman spectroscopy, and scanning electron microscopy (SEM) were used to characterize the as-prepared nanocomposite material. This binary Nb2O5@G nanocomposite was subsequently used to degrade doxycycline antibiotic with an efficiency of 98.5 % in 120 min under visible light conditions. To determine the optimal scope of the as-prepared composite catalyst, degradation studies were performed at different pH values, photocatalyst doses and temperatures. Kinetics studies revealed that the processes followed pseudo-first-order kinetics. In addition, the as-synthesized graphene, Nb2O5@G and Ag@G nanocomposites were used for selective application against E. coli bacterial strains. Overall, Ag@G has shown good potential application prospects in the development of antibacterial materials in comparison with Nb2O5@G and pristine graphene. This study highlights the potential of as-prepared graphene-based nanocomposites for use in waste treatment and environmental bioremediation.
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Some novel 1,2,3-triazole-based pleuromutilin derivatives were designed. Compound 7c displayed antibacterial activities against S. aureus, MRSA and S. epidermidis with MIC values ...0.062 μg/mL, and molecular modeling was performed to further investigate the mechianism.
•A series of novel 1,2,3-triazole-based pleuromutilin derivatives were synthesized.•Compound 7c displayed highest potency with MIC values 0.0625 μg/mL against S. aureus, MRSA and S. epidermidis.•Killing kinetics test revealed that tested compound displayed concentration-dependent effect.•Molecular docking showed that three strong hydrogen bonds were formed between 7c and ribosomal residues.
A novel class of pleuromutilin derivatives possessing 1,2,3-triazole as the linker connected to phenyl analogues were designed. The antibacterial properties of the prepared compounds were assessed in vitro against five strains (E. coli, S. aureus, S. epidermidis, and E. faecalis). Most of the tested compounds displayed potent antibacterial activities against gram-positive bacteria and 14-O-2-(4-((2,4-dinitrophenoxy)-methyl-1H-1,2,3-triazol-1-yl) acetamide)-2-methylpropan-2-yl) thioacetylmutilin (7c) exerted antibacterial activities against S. aureus, MRSA and S. epidermidis with MIC values 0.0625 μg/mL, representing 64-fold, 4-fold and 8-fold higher than tiamulin respectively. Compound 6e, 7c and 8c were chosen to carry out killing kinetics, which exhibited concentration-dependent effect. Subsequently, molecular modeling was conducted to further explore the binding of compound 6e, 7a, 7c, 8c and tiamulin with 50S ribosomal subunit from deinococcus radiodurans. The investigation revealed that the main interactions between compound 7c and the ribosomal residues were three hydrogen bonds, π-π, and p-π conjugate effects. Additionally, the free binding energy and docking score of 7c with the ribosome demonstrated the lowest values of −11.90 kcal/mol and −7.97 kcal/mol, respectively, consistent with its superior antibacterial activities.
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