Activity For Degradation Of Dye Research Articles

Hyaluronic acid mediated ZnO-NPs: In relation to electrical and photocatalytic activity for dye degradation

Various processes have been implemented to purify water; however, photocatalysis is comprehensively utilized in wastewater treatment and plays a significant role in water remediation. A photocatalyst is a nanostructured metal oxide ZnO nanoparticles, which boosts the reaction rate by its existence. ZnO nanoparticles show great performance in the absorption of various organic pollutants from wastewater. The objective of this research was to enhance the photocatalytic degradation performance of HA-added ZnO NPs using methylene blue as a model wastewater. Adjusting the main physical properties and photocatalytic efficiency of ZnO-NPs was performed using hyaluronic acid (HA), a natural bioactive stabilizer. The characterization of the fabricated ZnO-NPs samples with and without HA involved the utilization of FE-SEM, AFM, XRD, FTIR, PL, and I-V. As demonstrated by the FE-SEM analysis, ZnO formed rod-like structures, 3.0% HA:ZnO exhibited cauliflower-like structures, and 5.0% HA:ZnO displayed honeycomb-like structures. The X-ray diffraction (XRD) analysis demonstrated that the HA:ZnO nanoparticles exhibited hexagonal wurtzite structures. The average crystallite sizes of the ZnO, 3.0% HA:ZnO, and 5.0% HA:ZnO NPs were determined to be 25.20, 27.30, and 20.20nm, respectively, using the XRD patterns. The surface area was 4.439, 2.987, and 5.204m²/g of bare ZnO, 3.0% HA:ZnO, and 5.0% HA:ZnO-NPs were 4.439, 2.987, and 5.204 m2/g, respectively. It is very likely that there are two different decay and/or capture mechanisms in the emission spectra because the TRPL decay profile behaves in a double-exponential way. The fast decay time constant (τ1) was 212ps for bare ZnO and 3.0% HA:ZnO NPs and 231ps for 5.0% HA:ZnO NPs. The slow decay time constant (τ2) has a similar pattern, with values of 3.716, 2.836, and 2.985ns. The specific contact resistance values of the ZnO NPs increased from 0.113 to 45.624 (×105 Ωcm2) as a function of the HA concentration, as evidenced by the results of the electrical studies. The outcomes of this research present comprehensive information on noble-modified ZnO-NP materials containing HA for direct applications in electronic materials and photocatalytic degradation of organic waste in water.

Exploring the Versatility of Carbohydrate-Capped Green Silver Nanoparticles as Multi-dimensional Reagent for Targeted Applications

The present work describes the impact of the structural diversity of different carbohydrate molecules on the morphology and sensing ability of silver nanoparticles synthesized by a green protocol using Ocimum sanctum leaf extract, used as the reducing agent. Seven different monosaccharides were utilized as capping and stabilizing agents during the green synthesis of silver nanoparticles. The carbohydrate-capped nanoparticles were more stable in solution than the uncapped counterpart for at least three months. The formation and stability of the silver nanoparticles were analyzed using UV-visible, fluorescence spectroscopy, and X-ray diffraction studies, whereas the morphological characteristics were studied using scanning electron microscopic analysis. The different types of interaction of sugar molecules with silver atoms were studied using DFT calculation. Silver nanoparticles synthesized using D-galactose and L-arabinose, having an axial-OH group at the C-4 position, were found to have the smallest size with maximum efficacy as chemosensors for toxic mercury (II) ions in aqueous medium. The green silver nanoparticles were successfully employed as antimicrobial agents against different gram-positive and gram-negative bacteria. The catalytic activity of silver nanoparticles in degradation of organic dyes was also evaluated for Congo red, methyl orange and reactive blue in the presence of sodium borohydride. The nanoparticles showed excellent dye degradation activity with a minimum time duration.

Utilizing <i>Chlorophytum comosum</i> Leaf Extract for Eco-friendly Synthesis of Iron-Based Nanoparticles: Assessing Their Efficacy in Methyl Orange Dye Degradation and Antimicrobial Activities

Utilizing <i>Chlorophytum comosum</i> Leaf Extract for Eco-friendly Synthesis of Iron-Based Nanoparticles: Assessing Their Efficacy in Methyl Orange Dye Degradation and Antimicrobial Activities

Direct In Situ Polymer Modification of Titania Nanomaterial Surfaces via UV‐irradiated Radical Polymerization

Polymer modification of titania nanomaterials can provide media dispersibility and various functionalities onto the titania surface. Herein, we report the direct in situ polymer modification of the surface of titania nanotubes (TNTs) and titania nanoparticles (TNPs) via ultraviolet (UV)‐irradiated radical polymerization without any pretreatment of titania. The resulting polymer‐modified TNTs and TNPs dispersed well in solvents. The characterization of the products using various techniques including Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy–energy dispersive X‐ray spectroscopy confirmed the successful modification of the TNT and TNP surfaces by the polymers produced via UV‐irradiated radical polymerization. The polymers on the titania surface were isolated by dissolving titania using hydrofluoric acid and analyzed by means of size exclusion chromatography and matrix‐assisted laser desorption/ionization‐time of flight‐mass spectrometry. The polymer‐modified TNTs and TNPs maintained their photocatalytic activity in dye degradation under UV irradiation. Moreover, glycopolymer‐modified TNTs were successfully prepared using the UV‐irradiated polymerization system. The glycopolymer retained its lectin biding affinity on the TNT surface.

Cocos nucifera mediated green synthesis and characterization of BiOCl-Fe2O3 nanocomposite for photocatalytic dye degradation and electrochemical sensing of dopamine

In this study, BiOCl-Fe2O3 nanocomposite was synthesized by mixing 1:1 ratio of pre-prepared BiOCl and Fe2O3 in 100 mL of H2O using Cocos nucifera (coconut milk) as a green fuel through the microwave irradiation method. X-ray diffraction analysis (XRD), Scanning electron microscopy (SEM) with, Fourier transform infrared spectroscopy (FTIR), UV–vis spectroscopy(UV–vis), and photoluminescence (PL) spectroscopy analysis were used to determine the structure, morphology, and optical features of synthesised nanocomposites. The characterized composites were used to dye degradation and electrochemical activity. Synthesized BiOCl-Fe2O3were degraded methylene blue (MB) 96.2 % in 105 min irradiation of visible light. The BiOCl-Fe2O3exhibits significant catalytic activity towards dopamine(DA) under optimal conditions. Cyclic Voltammetry(CV) and Linear sweep voltammetry (LSV) with different concentrations of DA was studied. These results indicate that this BiOCl-Fe2O3 is an effective approach for the precise and reliable identification of DA signals in biological samples.

Eco-friendly synthesis of N- cholyl mercapto histidine capped silver nanoparticles and its sensing of mercury (II) ions and photo catalytic degradation of methyl orange

In this report, we have developed highly water soluble and stable silver nanoparticles (Ag NPs) utilizing N-Cholyl Mercapto Histidine (NCMH) as a reducing and stabilizing agent with near the primary critical micellar concentration (CMC) under ambient sunlight irradiation. Moreover, The NCMH was firstly synthesized by demonstrating the reaction between cholic acid and 2- Mercapto Histidine through a simple acid amine coupling approach. The primary and secondary CMC of NCMH surfactant was measured by pyrene (1 × 10−6 M) as a fluorescent probe, and values were found to be 3.2 and 13.1 mM respectively. The synthesized Ag NPs showed at neutral pH and highly stable for more than one year without any noticeable aggregation. The TEM analysis displays the synthesized Ag NPs having a spherical shape and average size of 9.6 ± 0.5 nm. The synthesis of stabilized Ag NPs was used for ultra-sensitive and selective detection of Hg2+ ions in aqueous medium were monitored by Uv–visible spectrometer and naked eyes with a lowest limit of detection (LOD) 7 nM. The photo-catalytic degradation of methyl orange (MO) by utilizing Ag NPs as nano-catalyst exhibits a potential degradation within a study period of 180 min. Concluding that, facile and cost effective green synthesis of NCMH capped Ag NPs possess excellent reducing ability towards the selective detection of Hg2+ ions along with photo-catalytic degradation of MO dye. These true findings detached an innovative pathway of Ag NPs towards the reactivity against the catalytic activity of dye degradation and selective sensing of Hg2+ ions. Thus it paves the way for extensive range of novel potential applications of Ag NPs in various environment friendly approaches of sensitive and analytical protocol in the future.

Hydrothermal synthesis of Pd doped rGO/ZnO nanocomposite for effective CBR dye degradation and antibacterial activities

A palladium (Pd)-doped rGO/ZnO nanocomposite was prepared using the hydrothermal method. The nanocomposite underwent various analytical assessments to determine its structural, optical, and morphological properties. The analytical results confirmed the successful formation of the Pd-doped rGO/ZnO composite. This composite, referred to as Pd-rGO/ZnO, was employed for the photocatalytic degradation of Coomassie Brilliant Blue R-250 (CBR) dye. The prepared photocatalyst, Pd-rGO/ZnO, exhibited a remarkable 93% efficiency in degrading CBR dye within 150 min under UV light. The enhanced photocatalytic and antibacterial activities were achieved by modifying rGO and introducing Pd, which effectively increased the reactive surface area and facilitated electron transfer. Moreover, the composite also displayed significant antibacterial activity in a dose-dependent manner.

Zeolite supported zinc oxide nanoparticles composite: Synthesis, characterization, and photocatalytic activity for methylene blue dye degradation

In the first stage of this study, zinc oxide nanoparticles (ZnO-NPs) were synthesized. The synthesized nanoparticles were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), selected area diffraction (SAED), and X-ray diffraction analyses (XRD). Subsequently, a composite material was obtained by coating ZnO-NPs with zeolite from Rátka, Hungary. The photocatalytic degradation of ZnO-NPs using Hungarian zeolite in the ZnO-Zeolite composite was investigated. The objective was to evaluate the efficacy of the ZnO-Zeolite composite in degrading methylene blue (MB) under ultraviolet-visible spectroscopy (UV). It was observed that the composite materials were influenced by the light source. The degradation rates showed that the ZnO-Zeolite composite with 100 mg L−1 MB achieved the highest photodegradation rate of 96.70 % when exposed to sunlight for 210 min. These findings indicate that the ZnO-Zeolite composite with a 1:5 ratio has the potential to significantly increase the photocatalytic activity, achieving a high yield of 96.70 % compared to raw zeolite. In the last stage of the study, equilibrium, kinetic, and thermodynamic studies were carried out. The photocatalytic maximum adsorption capacity of MB for the ZnO-Zeolite composite was calculated as qm= 41.32 mg g−1. In the adsorption and kinetic studies of the obtained composite, the best results were obtained with the Langmuir adsorption isotherm and pseudo-second-order kinetics. A desorption study has been conducted, and it has been determined that the composite can be reused for up to 7 cycles.

Dye degradation activity of biogenically synthesized Cu/Fe/Ag trimetallic nanoparticles

Abstract Over the past few decades, nanotechnology has gained momentum because of its potential to create a safer and healthier living environment using eco-friendly approaches. This study describes a safer, more dependable, and ecologically friendly technique of biologically synthesizing Cu/Fe/Ag trimetallic nanoparticles (NPs) using an aqueous leaf extract of Catharanthus roseus as the reducing and stabilizing agent. The synthesized trimetallic NPs were characterized by scanning electron microscope, Fourier transform infrared, dynamic light scattering, and ultraviolet–visible analysis and were evaluated for their potential applications, which included antioxidant properties and catalytic dye degradation. The result suggests that the antioxidant properties of Cu/Fe/Ag NPs are more significant than those of ascorbic acid, a known antioxidant, at lower doses (10 µg·ml−1) while a higher dose of 1,000 µg·ml−1 gives a 69.81% scavenging activity. The impact of Cu/Fe/Ag trimetallic NPs on the catalytic degradation of hazardous dyes such as phenol red (PR) and eosin yellow (EY) was also studied in this work. For PR and EY, the corresponding percentages of degradation were 76% and 48.6%, respectively.

Facile synthesis of nickel doped ZnO and CeO2 nanocomposite for efficient photocatalytic dye degradation, catalytic reduction and antimicrobial studies

The current research work reports on binary Nickel oxide-Zinc oxide (NiO-ZnO) and Nickel oxide-Cerium oxide (NiO-CeO2) nanocomposites synthesis by facile single step in-situ thermal decomposition method and its applications. The structural and morphological studies were examined using various characterization techniques like IR, UV-DRS, XRD and SEM with EDAX studies. The IR bands at 545-533 cm−1 corresponds to M-O stretching vibration. The XRD studies confirms the structural pattern of NiO-ZnO and NiO-CeO2 nanocomposites. SEM with EDAX results reveal the structure, composition and purity of synthesized nanocomposites. The nanocomposites were employed as photocatalyst for degradation of methylene blue and methyl orange dyes and as a catalyst toward 4-nitrophenol reduction. Antibacterial studies against E. coli (Gram-negative) and S. aureus (Gram-positive) bacterial pathogens were carried out using the nanocomposites. The outcomes show 97% efficiency in forty minutes for catalysis and 120 min for dye degradation and a better zone of inhibition in antibacterial studies for NiO-ZnO nanocomposite. The comparative result for both the nanocomposites discloses that the photocatalytic degradation, catalytic and antimicrobial efficiency of NiO-ZnO nanocomposite is more efficient than NiO-CeO2 nanocomposite. The results reveal the outstanding catalytic and dye degradation and antibacterial activity of NiO-ZnO than NiO-CeO2.

Sol-gel synthesized Cu/ZnS nanocomposites for photocatalytic dye degradation and antibacterial activity

Sol-gel synthesized Cu/ZnS nanocomposites for photocatalytic dye degradation and antibacterial activity

Reduced Work Function in Anatase ⟨101⟩ TiO2 Films Self-Doped by O-Vacancy-Dependent Ti3+ Bonds Controlling the Photocatalytic Dye Degradation Performance.

TiO2 has the proven capability of catalytically decomposing pollutants under light illumination, thereby embracing potential applications in wastewater management. The photocatalytic dye degradation activity is largely controlled by the optical band gap that dictates the extent of electron-hole pair generation via photon absorption, and the recombination kinetics of charges. In this context, the material's work function governs how easily the charge carriers can be transferred at the dye-adsorbed photocatalytically active sites. Accordingly, nanocrystalline TiO2 thin films are grown in the anatase phase with ⟨101⟩ orientation, using RF magnetron sputtering at 200 °C. Besides studying the film's structural morphology, optical band gap, and elemental composition, the electronic properties are extensively investigated. The work function of the material was controlled by varying the O-vacancy-dependent Ti3+ bonding configuration in the network. It has been demonstrated how the photocatalytic methylene blue dye degradation activity of the nanocrystalline TiO2 films of predominantly the anatase phase improves on reducing the sputtering pressure during deposition. At a low deposition pressure of 20 mTorr, a low work function of ∼4.2 eV of the film, resulting from the formation of a Ti3+-bond through the O vacancies in the network, potentially increases its carrier lifetime and delivers the superior photocatalytic activity (∼82.7% dye degradation with a rate constant of k ∼ 0.0073 min-1) via silently facilitating fast electron transfer from the photocatalyst to the dye in the aqueous solution. The higher stoichiometric film prepared at p = 40 mTorr exhibits an inferior photocatalytic activity (∼20.4% dye degradation with a rate constant of k ∼ 0.0009 min-1), as retarded by its higher work function of ∼4.62 eV, despite retaining a relatively low band gap. Thus, without using any heterojunction or extrinsically doped photocatalyst, the dye degradation can be controlled simply by reducing the work function of nanocrystalline TiO2 thin films via controlling the O-vacancy-dependent Ti3+ bonding in its self-doped network.

Bio-capped multifunctional CuO nanoparticles via Knautia arvensis for dye removal, antibacterial and antifungal efficiency, and molecular docking

Copper oxide nanoparticles (CuONPs) synthesized using Knautia arvensis flower extract in an environmentally friendly and one-step procedure were characterized by UV–vis, FT-IR, SEM and DLS. The in vitro antibacterial and antifungal activities of CuONPs were determined using E. coli, S. aureus and A. niger. In silico antibacterial and antifungal evaluation of CuONPs were performed by molecular docking analysis using chitin deacetylase of A. niger, topoisomerase IV of E. coli and tyrosyl-tRNA synthetase of S. aureus. The best binding energy was determined using these microbial targets in molecular docking analyses and the antimicrobial mechanisms between the microorganism and the CuONP were elucidated. The degradation potential of Remazol brilliant blue R (RBBR) and Napthol blue black (NBB) dyes in the presence of CuONPs were investigated. The peak obtained at 289 nm as a result of UV–vis analysis revealed the presence of CuONPs. The spherical morphology of CuONPs and the particle size varying between 88–289 nm were visualized by SEM. DLS analysis pointed out the mean diameter of CuONPs was 189 nm along with the PDI value of 0.324. The 600 and 595 cm−1 vibrations attained in the FT-IR spectroscopy showed the presence of CuONPs. In addition, the presence of phenolic compounds found in the plant extract responsible for bio-capping of copper ions into CuONPs were enlightened by the FT-IR analysis. Dye degradation activity of CuONPs was found as 69% and 71% using NBB and RBBR at 50 °C in 90 min, respectively. Antifungal and antibacterial interactions of CuONPs with chitin deacetylase of A. niger, topoisomerase IV of E. coli and tyrosyl-tRNA synthetase of S. aureus were analyzed in order to reveal the antimicrobial mechanisms of CuONPs and it was found that CuONPs demonstrate significant interactions with those proteins with binding energies −7.25, −7.14 and −7.89 kcal mol−1, respectively.

Environmentally friendly silver nanoparticles synthesized from Verbascum nudatum var. extract and evaluation of its versatile biological properties and dye degradation activity

In the present study, green synthesis of silver nanoparticles (VNE-AgNPs) via Verbascum nudatum extract was carried out for the first time. The synthesized AgNPs were characterized by different spectral methods such as UV–vis, FTIR, XRD, TEM, and EDAX. According to TEM analyses, the average size range of AgNPs was 17–21 nm, and the dominant peaks in the 111°, 200°, 221°, and 311° planes in the XRD pattern indicated the Ag-NPs FCC crystal structure. FTIR data showed that VNE-AgNPs interacted with many reducing, capping, and stabilizing phytochemicals during green synthesis. VNE-AgNPs had higher antibacterial activity against S. aureus and E. coli bacterial strains with a maximum inhibition zone of 21 and 18 mm, respectively, than penicillin 5 IU, used as a positive control in the study. The cytotoxic effect of VNE-AgNPs appeared at a concentration of 50 µg/mL in L929 cells and 5 µg/mL in cancer (A549) cells. When the impact of VNE-AgNPs and C-AgNPs on inflammation was compared, it was found that VNE-AgNPs increased TNF-α levels (333.45 ± 67.20 ng/mg-protein) statistically (p < 0.05) more than TNF-α levels (256.92 ± 27.88 ng/mg-protein) in cells treated with C-AgNPs. VNE-Ag-NPs were found to have a degradation efficiency of 65% against methylene blue (MB) dye within 3 h.Graphical

Gum karaya polymer-based biodegradable silver nanocomposite hydrogel through green approach for photocatalytic dye degradation and antimicrobial activity

The rise in industrialization and population growth has elevated water pollution to a critical environmental concern. This study introduces a novel polymer-mediated silver nanocomposite hydrogel for antibacterial activity and photocatalytic dye degradation for environmental remediation. In this study, silver nanocomposite hydrogels were developed using Karaya gum (KG), acrylamide, N-isopropyl acrylamide (NI), and 2-Bismethacryloyloxy ethyl phosphate (BMEP) as a crosslinker through a radical polymerization process. These hydrogels were utilized as templates for the eco-friendly synthesis of silver nanoparticles by employing an aqueous Canthium leaf extract as a reducing and stabilizing agent. Various analytical methods, including FTIR, UV–Vis, XPS, FESEM, EDX, XRD, AFM, and HRTEM, are characterized by the green synthesized KG-NIB-Ag nanocomposite hydrogel. Evaluation of the KG-NIB-Ag hydrogel involved examining its chemical composition, morphology, size, crystallinity, surface properties, bandgap, and chemical purity. TEM analysis validated an average crystallite size 33.2 nm. Moreover, the photocatalytic performance of the green-synthesized KG-NIB-Ag nanocomposite hydrogel was utilized to examine the degradation of Congo red dye under visible light irradiation. The findings of this study demonstrate that the degradation efficiency of CR reached approximately 73.25 % within 90 min, with a corresponding kinetic rate constant of 0.032 min−1. Furthermore, the antibacterial efficacy of the Ag nanocomposite hydrogel was evaluated against both Staphylococcus aureus and Escherichia coli. The disc diffusion method was employed to assess its antibacterial activity, and the diameter of the inhibition zones was measured. This study introduces an innovative and influential strategy for environmental remediation, emphasizing the potential of KG-NIB-Ag nanocomposite hydrogel in tackling ecological challenges associated with wastewater treatment across various industries.

Green Synthesis of Reduced Graphene Oxide Using the Tinospora cordifolia Plant Extract: Exploring Its Potential for Methylene Blue Dye Degradation and Antibacterial Activity.

Graphene has attracted significant attention recently due to its unique mechanical, electrical, thermal, and optical properties. The present study focuses on synthesizing green rGO using the Tinospora cordifolia plant extract by mixing it in a suspension of graphene oxide. The plant extract of T. cordifolia acts as a reducing agent and is cost-effective, renewable, and eco-friendly. Green-synthesized rGO (G-rGO) was characterized using FTIR, HR-SEM, EDX, and HR-XRD analyses. G-rGO consists of nanosheets with an average width of approximately 30 nm. G-rGO has a range of hydrodynamic radius (270-470) nm and an average ζ potential of -29.9 mV. Further, G-rGO was used as a nanoadsorbent for optimal exclusion of methylene blue (MB) dye using the response surface methodology (RSM). Adsorption results confirmed 94.85% MB dye removal with 58.81 mg g-1 adsorption capacity at optimum conditions. The G-rGO's antibacterial activity was also tested against Staphylococcus aureus (Gram-positive) and Escherichia coli (Gram-negative) bacteria, finding the exhibited zone of inhibition of 10, 11, and 15 mm and 10, 13, and 17 mm at 20, 40, and 80 μg mL-1 concentrations of G-rGO, respectively.

Cu-chelated polydopamine nanozymes with laccase-like activity for photothermal catalytic degradation of dyes

The industrial applications of enzymes are usually hindered by the high production cost, intricate reusability, and low stability in terms of thermal, pH, salt, and storage. Therefore, the de novo design of nanozymes that possess the enzyme mimicking biocatalytic functions sheds new light on this field. Here, we propose a facile one-pot synthesis approach to construct Cu-chelated polydopamine nanozymes (PDA-Cu NPs) that can not only catalyze the chromogenic reaction of 2,4-dichlorophenol (2,4-DP) and 4-aminoantipyrine (4-AP), but also present enhanced photothermal catalytic degradation for typical textile dyes. Compared with natural laccase, the designed mimic has higher affinity to the substrate of 2,4-DP with Km of 0.13 mM. Interestingly, PDA-Cu nanoparticles are stable under extreme conditions (temperature, ionic strength, storage), are reusable for 6 cycles with 97 % activity, and exhibit superior substrate universality. Furthermore, PDA-Cu nanozymes show a remarkable acceleration of the catalytic degradation of dyes, malachite green (MG) and methylene blue (MB), under near-infrared (NIR) laser irradiation. These findings offer a promising paradigm on developing novel nanozymes for biomedicine, catalysis, and environmental engineering.

Immobilized lipase enzyme on green synthesized magnetic nanoparticles using Psidium guava leaves for dye degradation and antimicrobial activities.

Zinc ferrite nanoparticles (ZnF NPs) were synthesized by a green method using Psidium guava Leaves extract and characterized via structural and optical properties. The surface of ZnF NPs was stabilized with citric acid (CA) by a direct addition method to obtain (ZnF-CA NPs), and then lipase (LP) enzyme was immobilized on ZnF-CA NPs to obtain a modified ZnF-CA-LP nanocomposite (NCs). The prepared sample's photocatalytic activity against Methylene blue dye (MB) was determined. The antioxidant activity of ZnF-CA-LP NCs was measured using 1,1-diphenyl-2-picryl hydrazyl (DPPH) as a source of free radicals. In addition, the antibacterial and antibiofilm capabilities of these substances were investigated by testing them against gram-positive Staphylococcus aureus (S. aureus ATCC 25923) and gram-negative Escherichia coli (E. coli ATCC 25922) bacterial strains. The synthesized ZnF NPs were discovered to be situated at the core of the material, as determined by XRD, HRTEM, and SEM investigations, while the CA and lipase enzymes were coated in this core. The ZnF-CA-LP NCs crystallite size was around 35.0nm at the (311) plane. Results obtained suggested that 0.01g of ZnF-CA-LP NCs achieved 96.0% removal of 5.0ppm of MB at pH 9.0. In-vitro zone of inhibition (ZOI) and minimum inhibitory concentration (MIC) results verified that ZnF-CA-LP NCs exhibited its encouraged antimicrobial activity against S. aureus and E. coli (20.0 ± 0.512, and 27.0 ± 0.651mm ZOI, respectively) & (1.25, and 0.625μg/ml MIC, respectively). ZnF-CA-LP NPs showed antibiofilm percentage against S. aureus (88.4%) and E. coli (96.6%). Hence, ZnF-CA-LP NCs are promising for potential applications in environmental and biomedical uses.

Enhanced Visible Light Photocatalytic Activity of Exfoliated Boron‐TiO2 Composite for Degradation of Rhodamine B and Nitrogen Fixation

AbstractThe design of an efficient, recyclable, visible light photocatalytic system was examined as a viable new green way to address environmental challenges such as removal of pollutants from wastewater and N2 fixation. The exfoliated boron (Bexf)‐Titanium oxide (TiO2) composite visible light active photocatalysts were successfully constructed via a simple wet chemical method by utilizing acetone as a solvent. The composite was evaluated for the photodegradation of Rhodamine B (RhB) dye and reduction of N2, which exhibits improved photocatalytic activity for degradation of RhB as well as for reduction of N2. Experiments with different quenchers indicate that the photogenerated superoxide radical anion (O2⋅−) plays a significant role in the degradation of RhB as well as for N2 reduction reactions. The composite catalyst shows good photostability and there is no significant reduction of the catalyst activity for dye degradation up to 4 cycles of reaction. This work affords a significant view into the design of reusable TiO2 composite materials for photocatalytic RhB degradation and nitrogen fixation.

Antioxidant and dye degradation activity of green synthesized silver-iron oxide (Ag-Fe2O3) bimetallic nanoparticles

This research introduces an eco-friendly method for synthesizing silver-iron oxide bimetallic nanoparticles using cabbage peel extract, serving as both reducing and stabilizing agents. The successful production of nanoparticles is comprehensively analyzed through UV-Vis spectroscopy, Fourier transformation infrared spectroscopy (FTIR), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The UV, XRD and EDS results indicated the elemental composition of Ag and Fe, suggesting the formation of a silver-core iron-shell bimetallic nanoparticles with a size of 22.3 nm, which was followed by an assessment of their antioxidant and catalytic properties. The findings revealed notable antioxidant capabilities, along with the efficient degradation of methyl red and phenol red dye. Remarkably, the Ag-Fe2O3 bimetallic nanoparticles exhibited good scavenging activity, reaching 63.87% at a concentration of 1000 µg/mL. The most significant dye degradation is observed for phenol red, achieving a remarkable 78% degradation within just 8 minutes. These results indicate the potential of Ag-Fe2O3 bimetallic nanoparticles derived from cabbage peels as promising agents for antioxidant and catalytic applications, especially in addressing dye-contaminated wastewater concerns.