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The study focused on creating a novel and environmentally friendly nanocatalyst using cellulose (Cell), β-Cyclodextrin (BCD), graphene oxide (GO), Cu 2 O, and Fe 3 O 4.The nanocatalyst was prepared by embedding GO and Cu 2 O into Cell-BCD hydrogel, followed by the in-situ preparation of Fe 3 O 4 magnetic nanoparticles to magnetize the nanocomposite. The effectiveness of this nanocatalyst was evaluated in the one-pot, three-component symmetric Hantzsch reaction for synthesizing 1,4-dihydropyridine derivatives with high yield under mild conditions. This novel nanocatalyst has the potential for broad application in various organic transformations due to its effective catalytic activity, eco-friendly nature, and ease of recovery. [Display omitted] • A magnetic nanocatalyst based on cellulose-cyclodextrin hydrogel was synthesized. • The Cellulose- cyclodextrin hydrogel was embedded with Graphene oxide and Cu 2 O NPs • This nanocomposite catalyzed one-pot, three-component symmetric Hantzsch reaction. • Synthesis of 1,4-dihydropyridine derivatives was achieved using this nanocatalyst. • The cell-BCD hydrogel/GO/Cu 2 O/Fe 3 O 4 nanocatalyst can be recovered multiple times. [ABSTRACT FROM AUTHOR]

We report the synthesis of a novel electrochemical biosensor comprising of cupric oxide (CuO) nanoparticles (NPs) mediated poly(hydroxybutyrate) (PHB) composite film with polyvinyl alcohol (PVA) as a binder/template support using the solution casting method for the detection of a biomolecule i.e., ascorbic acid (AA). The specimens were characterized for surface, chemical, mechanical, optical, and electrochemical attributes. The results expressed regular mediation of CuO NPs in the PHB/PVA matrix towards nanobiocomposite formation with enhanced crystallinity, inter-molecular interactions, mechanical, and electrochemical attributes, and decreased hydrophilicity and bandgap, thus being useful in potential optoelectronic devices. The synthesized biocomposite film exhibited a tensile strength of 86.24 ± 4.10 N which might be due to reinforcement/uniform dispersion of the CuO nanofiller in the PHB-based matrix. The PHB/CuO composite, then, deposited on a glassy carbon electrode surface exhibited good electrocatalytic activity towards the AA in the aqueous media even at low analyte concentrations. Such modified electrode surfaces with metal/biopolymer complex could find possible applications in the detection of other bioactive molecules. • We present the synthesis of CuO nanoparticles (NPs) mediation in poly(hydroxybutyrate) (PHB)-based composite. • The nanocomposite films were thermally stable and less hydrophilic as compared to the control. • The nanobiocomposite was deposited on a glassy carbon electrode for biosensing application. • Such modified electrode surfaces may find potential applications in the detection of bioactive molecules. [ABSTRACT FROM AUTHOR]

New chitosan Schiff base (CS-NB) and its CS-NB-NiFe nanocomposite have been prepared and characterized by FTIR spectroscopy, XRD, SEM and DSC. FT-IR spectra and XRD patterns revealed the preparation of chitosan Schiff base CS-NB and its CS-NB-NiFe nanocomposite. DSC demonstrated the endo and exothermic correspondence the evaporation of solvent and decomposition of pyranose ring, respectively. Antibacterial activities was evaluated for the as-prepared compounds against two Gram-positive (Staphylococcus aureus and Bacillus cereus) and two Gram-negative (Escherichia coli and Pseudomonas aeruginosa) bacteria and the results shows that the antibacterial activities of the compounds are found to be stronger than that of chitosan. The order of antibacterial effect according to inhibitory zone around is as follows: S. aureus > E. coli > B. cereus > P. aeruginosa. In addition, the removal of methyl green (MG) dye using CS-NB and its CS-NB-NiFe nanocomposite were analyzed and results showed that the compounds can be effectively used to remove of MG from aqueous solution. Results show that the percentage removal of MG by nanocomposite is higher than Schiff base. [ABSTRACT FROM AUTHOR]

A novel AgO-CoO-CdO/Poly(alanine)-chitosan-reduced graphene oxide (PACSGO) nanocomposite was developed to study the degradation efficiency under visible light irradiation. The AgO, CoO, CdO nanoparticles and AgO-CoO-CdO heterometal oxides were prepared by using the chemical method. The crystallite structure and phase studies were studied by the X-ray diffraction assay. The SEM images were evaluated to explore the morphology of the prepared materials. EDS analysis and FTIR spectra confirmed the formation of nano-materials with high purity. The optical bandgap values were measured via Kubelka-Munk plot showing that the metal oxides produced a new energy state in the electronic level for high photocatalysis efficiency. The incorporation of AgO-CoO-CdO in PACSGO showed a novel nano-photocatalyst for substantial degradation of dye in low process time. The catalysis data displayed that PACSGO based AgO-CoO-CdO nanocomposites ensured a strong potential to degradation of organic dye compounds from water in during photocatalysis reaction. The beneficial anti-pathogenic bacterial performance of the AgO-CoO-CdO/PACSGO nanocomposites was further demonstrated by a substantial reduction in the amount of Staphylococcus aureus , Escherichia coli , Pseudomonas aeruginosa, and B. cereus medium and increase in inhibition zone value with the addition of the AgO-CoO-CdO/PACSGO nanocomposites. [ABSTRACT FROM AUTHOR]

In this work, we present Co 3 S 4 -SnO 2 supported polyvinylpyrrolidone-cellulose (PVPCS) nano-structure for Lidocaine degradation. The nanostructure was characterized by various techniques i.e. morphological and optical ones. The results have demonstrated that Co 3 S 4 -SnO 2 nanocomposites were evenly supported on the PVPCS. Moreover, the photocatalysis performances of the catalysts were investigated under ultra-violet (UV) light irradiation. The nano-structure Co 3 S 4 -SnO 2 /PVPCS composite (98.72%) revealed the highest photocatalysis performance as compared to SnO 2 nanoparticles, and Co 3 S 4 -SnO 2 nanocomposites. The photo-stability of nano-structure Co 3 S 4 -SnO 2 /PVPCS composite was characterized using cyclic catalytic experimental. Results demonstrated a substantially stable performance of the nano-structure Co 3 S 4 -SnO 2 /PVPCS composite. The biological properties of Co 3 S 4 -SnO 2 /PVPCS composite were investigated through the antibacterial (versus Staphylococcus aureus , and Escherichia coli) and antifungal studies (Candida albicans). As the results declared, Co 3 S 4 -SnO 2 nanocomposites have substantial biological properties as compared to SnO 2 nanoparticles, and Co 3 S 4 -SnO 2 nanocomposites. • The Co 3 S 4 -SnO 2 /PVPCS composites were prepared by facile method. • The photocatalysis efficiency of Co 3 S 4 -SnO 2 /PVPCS was studied for degradation of Lidocaine. • The Co 3 S 4 -SnO 2 /PVPCS composites revealed the highest photocatalysis efficiency. • The Co 3 S 4 -SnO 2 /PVPCS composites has great antimicrobial properties [ABSTRACT FROM AUTHOR]