2 and 4 wt% of g-C3N4 and a fixed amount of CS-doped ZnO have been prepared using co-precipitation techniques for catalytic dye degradation and antibacterial application. X-ray diffraction patterns ...and FTIR spectra have proven the confirmation of the development of g-C3N4/CS doped ZnO nanorods (NRs). The TEM study confirmed the formation of nanorods for ZnO, a sphere-like structure with the addition of CS and a layer over the carbon sphere, and nanorods were observed by doping g-C3N4. In the presence of NaBH4, 4 % g-C3N4/CS/ZnO nanostructures degraded 94.4 % RhB dye within 2 min, while 3.25 nm inhibitory zone was measured against Escherichia coli (E. coli) bacteria. These enhanced results were attributed to the increased surface area, which provided more active sites for the catalytic reduction and generated reactive oxygen species, contributing to enhanced antibacterial activity. The theoretical study of antibacterial activity for ZnO, CS-doped ZnO, and CS/g-C3N4-doped ZnO NRs was conducted through Molecular docking analysis against DNA gyrase in E. coli. The results of the docking studies show that these NRs may function as inhibitors of DNA gyrase. These findings provide valuable insights into the potential applications of NRs within the field of wastewater purification and biological sciences.
Display omitted
•Synthesized g-C3N4/CS/ZnO nanocatalyst using co-precipitation technique•Highly doped ZnO showed 94.4 % RhB degradation in neutral medium within 10 min.•Doped ZnO showed 3.25 mm inhibitory zone was measured against the E. coli pathogen.•Prepared nanocatalysts are highly stable against RhB degradation.
Zinc-aluminum layered double hydroxide (Zn–Al LDH) doped with 3 wt% of polyvinyl pyrrolidone (PVP) and various concentrations (2 and 4 wt%) of barium (Ba) doped PVP-LDH were synthesized by ...co-precipitation method to effectively remove rhodamine-B (RhB) dye from wastewater and investigate its antibacterial properties against S. aureus. The composition and morphology of the layered structure were confirmed employing several characterization techniques: X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy, and transmission electron microscopy (TEM). Dopants into LDH enhanced oxygen vacancies, increasing the number of active sites and demonstrating superior capability to degrade RhB dye. The results also revealed that doped LDH effectively inhibits the biofilm formation of S. aureus bacteria. The 4 wt% Ba doped sample exhibited a maximal degradation (93.92 %) in basic medium and 72.66 % antimicrobial efficiency against S. aureus. To confirm the effectiveness of PVP and Ba-doped LDH as antimicrobial agents, molecular docking investigations were carried out targeting the DNA gyrase and tyrosyl-tRNA synthetase enzymes of S. aureus.
•Low-temperature co-precipitation method was employed to synthesize Ba-doped PVP/Zn–Al LDH.•4 % Ba-doped sample showed a significant inhibition zone of 5.05 mm against S. Aureus.•The catalytic activity in the basic medium revealed 93.92 % decolorization of RhB dye.•The polymer-based ternary composite was a potent dye degrader and bactericidal agent.
Display omitted
•Co-precipitation synthesized of graphitic carbon nitride and eudragit doped CdTe.•4 wt% of C3N4 showed a significant inhibition zone of 8.65 mm against S. aureus.•Catalytic activity ...in the neutral medium revealed 98.1 % decolorization of MO dye.•Polymer-based ternary composite was a potent dye degrader and bactericidal agent.
Co-precipitation procedure was employed to prepare efficient ternary system-based catalysts composed of various concentrations (2 and 4 wt.%) of graphitic carbon nitride (g-C3N4) and fixed amount (3 wt.%) of eudragit (Eud)-doped cadmium telluride (CdTe) nanostructures (NSs). The main objective of this study was to explore and enhance the dye degradation potential by changing the recombination rate of CdTe with doping and improving their multifunctional efficacy as catalysts and antibacterial agents. The dopants have altered the particle size, dispersal and optical properties of CdTe. The different concentrations of g-C3N4 and fixed amount of Eud, reaction temperature, and duration influence these characteristic properties of CdTe. g-C3N4 /Eud-doped CdTe with porous structure showed excellent methyl orange (MO) dye degradation efficiency (98.0 %) in neutral medium. Furthermore, 4 wt.% of g-C3N4 doped NSs exhibited significant inhibition zone as 9.35 ± 0.08 mm against MDR S. aureus bacteria. The molecular docking studies were conducted to elucidate the mechanistic interactions between g-C3N4/Eud-doped CdTe nanostructures and the target enzymes DNA gyrase S. aureus and D alanine-D-alanine ligase (ddlB)S. aureus, in order to justify their microbicidal efficacy.
•Nb2O5 nanorod arrays were produced via a microwave-assisted hydrothermal method.•50-fold reduction in synthesis times when compared to the current methods.•Materials are crystalline with optical ...behavior typical of semiconductors.•Strong potential for industrial application as large-scale advanced electrodes.
Homogeneous nanostructures of Nb2O5 were synthesized rapidly using a microwave-assisted hydrothermal method. Niobium plates were used as raw materials without the addition of corrosive HF nor any directing agent. The composition and morphology of the structures were determined by scanning electron microscopy (SEM), X-ray diffraction (XRD), and UV–vis and Raman spectroscopies. The results show that microwave irradiation reduced synthesis time from several days to 2 h. SEM images reveal the formation of structured nanorod arrays at 200 °C. The optical band gap of the nanorods suggests a large-gap semiconducting behavior. These results indicate that the microwave-assisted hydrothermal method is a fast and cheaper technique for the production of homogeneous Nb2O5 nanorod arrays.
•BaO NRs doped PVP and g-C3N4 was carried out using co-precipitation rout.•It ascribed a notable result (100 %) of RhB degradation in basic medium.•It represents the remarkable antimicrobial efficacy ...(0–3.05 mm) against S. aureus.•This ternary composite was proven an efficient catalyst and inactivation of S. aureus.
The removal of cationic dyes from wastewater and inactivation of bacterial pathogens in mastitic milk attracted significant attention from researchers to overcome their impact on the environment and ecosystem challenges. In recent research work, the synthesis of BaO nanorods (NRs) capped with 3 wt% polyvinylpyrrolidone (PVP) and varying quantities (2 and 4 wt%) of graphitic-carbon nitride (g-C3N4) was carried out using an eco-friendly, low-cost co-precipitation approach. The primary objective of this study is to explore the potential application of a ternary system for the disinfection of contaminated water besides investigating its antibacterial capabilities. Adding g-C3N4 and PVP to BaO enhances morphological and chemical stability, suppresses the population of charge carriers, facilitates dye degradation, and exhibits notable efficacy in antibacterial activity owing to its reduced bandgap energy. The higher concentration of g-C3N4/PVP- BaO ascribed notable results of Rhodamine B (RhB) degradation (19.3–100 %) in a basic medium rather than acidic and neutral media. A high concentration of g-C3N4 nanocatalyst represents the remarkable antimicrobial efficacy (0–3.05 mm) against Staphylococcus aureus (S. aureus). The findings from molecular docking investigation indicate g-C3N4/PVP-BaO NRs suppressive effects for DNA gyraseS. aureus, which is comparable with their reported bactericidal efficacy.
•Effect of sulfur precursor on photocatalytic activity of MoS2.•Favored heterogeneous nucleation on defect sites.•Heterogeneous nucleation a fancy tool to evaluate density of active sites.
In the ...present work, we applied heterogeneous nucleation of gold nanoparticles to assess the density of defects on MoS2 nanostructures presenting different morphologies and surface areas. The use of L-cysteine resulted in the formation of flower-shaped MoS2 nanostructures with a diameter of about 300 nm and petals measuring around 30 nm. In contrast, when 3-mercaptopropionic acid was employed, it led to the formation of large agglomerates, here referred to as nanoclouds, with a diameter of approximately 500 nm. The nucleation of gold nanoparticles on defect sites of MoS2 suggested that MoS2 obtained from 3-mercaptopropionic acid has a higher content of active sites for hydrogen production compared to MoS2 obtained from L-cysteine.
Co-precipitation method was adopted to synthesize ternary heterostructure catalysts La/CS-CoSe NSs (lanthanum/chitosan‑cobalt selenide nanostructures) without the use of a surfactant. During ...synthesis, a fixed amount (3 wt%) of CS was doped with 2 and 4 wt% La to control the growth, recombination rate and stability of CoSe NSs. The doped samples served to enhance the surface area, porosity and active sites for catalytic degradation of rhodamine B dye and antibacterial potential against Staphylococcus aureus (S. aureus). Additionally, the synthesized catalysts were examined for morphological, structural and optical characteristics to assess the influence of dopants to CoSe. XRD spectra verified the hexagonal and cubic structure of CoSe, whereas the porosity of the undoped sample (CoSe) increased from 45 to 60 % upon incorporation of dopants (La and Cs). Among the samples analyzed during this study, 4 % La/CS-CoSe exhibited significant bactericidal behavior as well as the highest catalytic reduction of rhodamine B dye in a neutral environment. Molecular docking analysis was employed to elucidate the underlying mechanism behind the bactericidal activity exhibited by CS-CoSe and La/CS-CoSe NSs against DHFRS. aureus and DNA gyraseS. aureus.
Application of photocatalysts that strongly absorb within the visible range is a common strategy to improve the efficiency of photoelectrochemical (PEC) systems; this may translate to high ...photocurrents, but it is not always the case. Here, we show that nitrogen doping enhances visible light absorption of TiO2; however, it does not necessarily result in improved PEC performance. Depending on the applied external potential, N-doping can improve, or degrade, PEC performance either under water oxidation conditions or via hole scavenging (Na2S/Na2SO3). In this work, we developed a holistic approach to evaluate the true impact of N doping in TiO2 on PEC performance. Interstitial and substitutional N doping are experimentally explored for the first time through a simple and novel PEC approach which complemented X-ray photoelectron analyses. Using this approach, we show that interstitial N doping of anatase TiO2 dominates up to 400 °C and substitutional doping up to ca. 600 °C, without rutile formation. This reveals that the bottleneck for doping higher N-concentrations in TiO2 is the direct transformation to thermodynamically favorable N-rich phases, such as TiN/Ti2N at 700 °C, inhibiting the formation of rutile phase. Transmission electron microscopy revealed that N doping proceeds mainly from the inner to the outer tube walls via nitridation and follows a preferential pathway from interstitial to substitutional doping. Direct PEC experimental evidence on visible light activation of N doped TiO2, and the location of interband states, showed acceptor levels of 1.0 eV for substitutional and 0.7 eV for interstitial doping above the TiO2 valence band maximum. In addition, due to O vacancies and Ti3+ species, donor levels below the conduction band minimum were also created. These levels act as trapping/recombination centers for charge carriers and, therefore, the gain in the visible range due to N doping does not translate to an improved PEC performance by these structural defects. Ultimately, we show that whilst there is a benefit of visible light absorption through N doping in TiO2, the PEC performance of the samples only surpasses pristine TiO2 at relatively high biasing (>0.3 V vs. Ag/AgCl).
In this study, nickel selenide (NiSe), Ag/C 3 N 4 –NiSe, and C 3 N 4 /Ag–NiSe nanowires (NWs) were synthesized via coprecipitation. The prepared NWs were employed for the degradation of the rhodamine ...B (RhB) dye in the absence of light using sodium borohydride (NaBH 4 ), bactericidal activity against pathogenic Staphylococcus aureus ( S. aureus ) and in silico docking study to investigate the d -alanine ligase (DDl) and deoxyribonucleic acid (DNA) gyrase of S. aureus . NWs demonstrate a catalytic degradation efficiency of 69.58% toward RhB in a basic medium. The percentage efficacy of the synthesized materials was evaluated as 19.12–42.62% at low and 36.61–49.72% at high concentrations against pathogenic S. aureus . Molecular docking results suggest that both C 3 N 4 /Ag-doped NiSe and Ag/C 3 N 4 -doped NiSe possess inhibitory activities toward DDl and DNA gyrase of S. aureus , which coincides with the in vitro bactericidal activity. Based on the research outcomes, the synthesized NWs show potential as an effective agent for water purification and resistance to microbial contaminants.
PDF
