Nano Nickel Oxide Research Articles

Green NiO nanoparticle-integrated PVA-alginate hydrogel: potent nanocatalyst for efficient reduction of anthropogenic water pollutants.

Hydrogel nanocatalyst composed of nickel oxide (NiO) nanoparticles embedded in PVA-alginate hydrogels were potentially explored toward the reduction of anthropogenic water pollutants. The NiO nanoparticleswas accomplished via green method using waste pineapple peel extract. The formation of the nanoparticles was affirmed from different analytical techniques such as UV-Vis, FTIR, XRD, TGA, FESEM, and EDS. Spherical NiO nanoparticles were obtained having an average size of 11.5nm. The nano NiO were then integrated into PVA-alginate hydrogel matrix forming a nanocomposite hydrogel (PVALg@ NiO). The integration of nano NiO rendered an improved thermal stability to the parent hydrogel. The PVALg@ NiO hydrogel was utilized as a catalyst in the reduction of 4-nitrophenol (4-NP), potassium hexacyanoferrate (III), rhodamine B (RhB), methyl orange (MO), and malachite green (MG) in the presence of a reducing agent, i.e., NaBH4. Under optimized conditions, the reduction reactions were completed by 4.0min and 3.0min for 4-NP and potassium hexacyanoferrate (III), respectively, and the rate constant was estimated to be 1.14min-1 and 2.15min-1. The rate of reduction was found to be faster for the dyes and the respective rate constants were be 0.17s-1 for RhB, MG and 0.05s-1 for MO. The PVALg@ NiO hydrogel nanocatalyst demonstrated a recyclability of four runs without any perceptible diminution in its catalytic mettle. The efficacy of the PVALg@ NiO hydrogel nanocatalyst was further examined for the reduction of dyes in real water samples collected from different sources and the results affirm its high catalytic potential. Thus, this study paves the path for the development of a sustainable hydrogel nanocatalyst for reduction of hazardous pollutants in wastewater treatment.

The Effect of Nano Nickel Oxide(n-NiO) on the Hardness properties of As-Cast and Cured Nano Composite

The Effect of Nano Nickel Oxide(n-NiO) on the Hardness properties of As-Cast and Cured Nano Composite

Determine methylene blue based on carbon paste electrode modified with nanoparticles of nickel oxide-nitrogen carbon quantum dots and carbon structures by cyclic voltammetry

This paper deals with an electrochemical method for the determination of methylene blue (MB) by fabrication of an electrode based on a carbon paste modified with nano-nickel oxide and nitrogen carbon quantum dots (NiO-NCQD), graphene-carbon nitride (g-C3N4), reduced graphene oxide (rGO), and graphite powder and paraffin oil are as a plasticizer. This electrode is used as a working electrode. The analytical method used is cyclic voltammetry (CV), The oxidation-reduction curve of methylene blue was shown using this electrode. It is a quasi-reversible curve, and it works at (pH =1) and the best acid used is HCl a concentration of (0.1M). It was also found that the linear range is within the range of (7.99-31.98 mg L-1). The standard deviation (SD) and relative standard deviation (RSD%) were obtained at (0.361 mg L-1 and 0.294 mg L-1) and (4.52% and 3.68%) for both oxidation and reduction respectively. Retrospective, the limit of quantitative (LOQ) and limit of detection (LOD) were achieved at (99.65%; 99.70%), (0.24 mg L-1; 0.13 mg L-1), and (0.071 mg L-1; 0.039 mg L-1) for both oxidation and reduction respectively. Methylene blue was analyzed by UV-Vis spectrophotometry at (663 nm).

Phase Transition of Thermally Treated Polyhedral Nano Nickel Oxide with Reduced Band Gap

Nickel oxide (NiO) is a semiconducting material which exhibits a unique electronic structure. Because of its distinctive electronic properties, NiO stands as an intriguing candidate for various applications in optoelectronics, photo catalysis, and energy devices such as solar cells. In the present work efforts have been made to tailor the band gap of NiO. A simple co-precipitation method followed by heat treatment is utilized to synthesize the material. Prior to heat treatment, x-ray diffraction study of the as synthesized material showed the presence of nickel hydroxide [Ni(OH)2]. On calcination for one hour at 1000oC, a single phase NiO wasrevealed. After heat treatment it was noticed that the particle size was found to be increased. The absorption spectra of [Ni(OH)2] and NiO were recorded using UV-Vis spectroscopy method. Using Tauc plot a band gap of 4.2 eV and 1.8 eV for Ni(OH)2 and NiO was observed respectively. It is observed that a significant decrease in band gap of NiO was noticed. Surface morphological study was carried out by using FESEM, which revealed the transformation of sheet like structures of [Ni(OH)2] to polyhedral shaped NiO on calcination. The presence of nickel and oxygen was confirmed by the energy dispersive spectrometry analysis.

Synthesizing and exploring the structural and optical properties of PVA/PVP/PEG polymeric sheet upon doping with nano nickel oxide (NiO) for CUT-OFF filters

Developing novel composite polymeric materials with noteworthy characteristics is vital for crucial research and optical applications in numerous sectors. Using the solution casting method, the blend of the hydrophilic (polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), and polyethylene glycol (PEG)), polymeric composites was evaluated as host carriers for important metal oxide particles of NiO at different concentrations (0.05,0.27,0.55,2.7,5.5,11.04 wt%). The semi-crystalline structural behavior of the produced polymeric sheets was determined by X-ray diffraction (XRD), the surface morphology and the mean grain size of the NiO nanoparticles were investigated through the scanning electron microscopy (SEM), as well as the presence of the O–H group on the PVA/PVP/PEG polymers was identified by the remarkable Fourier transform-infrared (FT-IR) analysis. Using a UV–Vis spectrophotometer, the remarkable impacts of various NiO dopant ratios on the optical properties, transmittance, absorbance, absorption coefficient, and extinction coefficient, of the considered NiO: PVA/PVP/PEG composite sheets were examined. Pure PVA/PVP/PEG polymeric composites have transmittance spectra that are 91 % in the visible range, then drop to 0 % as raising the concentrations of NiO NPs. Additionally, the π-π transition of blend segments is revealed by the studied NiO-doped PVA/PVP/PEGsheets' absorption spectra, which peak at 350 nm. The direct/indirect bandgaps for the pure polymer are (5.40 and 4.98 eV), and they are reduced to (4.81 and 2.84 eV) with the weight of NiO increased, respectively. Based on the optical energy bandgaps (Eg) of the NiO: PVA/PVP/PEG thin composite sheets, seven different models were used to precisely quantify the nonlinear optical characteristics and linear refractive index (n). With the highest concentrations of NiO, the high-frequency dielectric values increased, and the static dielectric constant decreased. The prepared nanocomposites reduced the intensity of three different types of lasers at a wavelength (635 nm, 532 nm, and 450 nm) and the intensity of optical lampe at power 1036 W/m2. The outstanding findings strongly suggest that the proposed NiO: PVA/PVP/PEG thin composite sheets be designed for various optoelectronic, optical filters, and laser medical applications.

Effects of Nano-Nickel Oxide on Thermokinetics, Thermal Safety, and Gas-Generating Characteristics of 5-Aminotetrazole Thermal Degradation

5-aminotetrazole (5AT) has been widely used as a fuel in SPGGs for its high nitrogen content, heat resistance, and environmentally friendly product. However, 5AT-based propellants still have disadvantages, such as a high exhaust temperature and unstable combustion rate, which somewhat limit their application. Given that transition metal oxides are typically employed in small quantities to enhance the performance of solid propellants, this study selected nickel oxide (NiO) nanoparticles as a catalyst and employed them in conjunction with 5AT via mechanical ball milling to investigate their impact on the pyrolysis behavior of 5AT. It was found that the nanoscale NiO particles can significantly reduce the thermal degradation temperature of 5AT according to TG-DSC tests. The calculation of the energy required to initiate the pyrolysis of 5AT using three kinetic methods, namely Friedman (FR), Flynn–Wall–Ozawa (FWO), and Kissinger–Akahira–Sunose (KAS), indicated that the use of NiO nanoparticles can reduce the energy required by more than 46 kJ mol−1, thereby increasing the likelihood of 5AT pyrolysis. Meanwhile, the reduced thermal safety parameters indicated that NiO makes 5AT more susceptible to thermal decomposition due to thermal explosion transition, so more care is needed for the storage of 5AT. Moreover, the TG-FTIR test was conducted to study the pyrolysis mechanism with or without NiO; the results showed that NiO exerts different catalytic effects on the gas products. The results from this study can offer direction and recommendations for future research on solid propellants.

Extraction and characterization of nickel oxide nanoparticles from Hibiscus plant using green technology and study of its antibacterial activity

Introduction and Aim: Nanomaterials are tiny particles varying in size from 1-100 nanometers with wide implications in the fields of medicine, biology, and pharmaceutical sciences. In this study, we aimed to extract Nickel oxide nanoparticles (NiO-NP) from the tropical hibiscus plant, and evaluate these nanoparticles for their structural features as well as study the antimicrobial activity of NiO-NPs against Gram-positive and Gram-negative bacteria. Materials and Methods: NiO nanoparticles were synthesized by green nanotechnology using hibiscus extract and nickel nitrate as precursors. The NiO nanoparticles obtained were investigated for its surface properties using X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and UV-Vis analysis. Transmission Electron Microscopy (TEM) was used in calculating the size of NiO nanoparticles. The antimicrobial activity of the NiO particles was tested against E. coli and S. aureus test strains. Results: X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy studies confirmed the formation of pure and well- crystallized NiO nanoparticles. The TEM analysis displayed that the size of nanoparticles to be within the limits of 71. The NiO-NP particles displayed antimicrobial properties and inhibited the growth of bacterial test strains used in this study. Conclusion: The study demonstrated that nano Nickel oxide (NiO) particles could be successfully prepared using the hibiscus aqueous plant extract. The NiO-NP exhibited antimicrobial property against pathogenic E. coli and S. aureus bacteria, indicating that it could be used in formulations for treating infections by these organisms.

Influence of Copper and Zinc Doping on Optical Properties of Nano Nickel Oxide Films Deposited by Sol-Gel Method

Influence of Copper and Zinc Doping on Optical Properties of Nano Nickel Oxide Films Deposited by Sol-Gel Method

A comparative study of green and chemically synthesized nano nickel oxide for multifunctional applications

Nickel oxide nanoparticles [NiO NPs] were synthesized using chemical (Combustion method) and green route using Coccania grandis leaf extract (Probe sonication method). SEM reveals that, NiONPs synthesized using green route showed agglomerated porous, having diameter of 200 nm. Whereas, chemically synthesized NiO NPs were uniform in size with diameter of 180 nm. From PXRD analysis, average crystallite size of green and chemically synthesized NiONPs was found to be 52.6 nm and 41.9 nm respectively. NiO NPs synthesized using the green route. Antibacterial study of NiONPs (synthesized by green route) displayed maximum zone of inhibition i.e10.8mm (Staphylococcussp), 9.4mm (E coli) and 7.4mm (Pseudomonas) compared to 8mm (Staphylococcussp), 9mm (Ecoli). Photocatalytic activity of direct green dye was effective in NiO NPs synthesized by chemical (69.25%) compared to the green route (25.65%). In electrochemical analysis (biosensor), one reduction and one oxidation peak were observed and were highly effective in sensing Fe3+ under alkaline medium in green route NiO NPs.

Effectiveness of nano-nickel oxide with manufactured plant extract and its properties on inhibiting the growth of some types of bacteria and fungi isolated from skin infections

Nickel oxide nanoparticles prepared in the first and second methods were synthesized and the properties of the solutions were shown. The XRD examination according to the MT values was at the drawing amount (111) 37.2, (200) 44.6, (220) 62.5 corresponding to the international measurements of Miller's Theta2 coefficient, while it was Sem examined the appearance of the shape of the rocky, cork, or spherical and spherical particles with a size of 10-25 nm, the TEM examination gave that nanoparticles with a size not exceeding 0.5-40 nm, the UV test of absorbance and permeability indicated that the solution is homogeneous and very light and the nanomaterial is at a value between 236-800 nm and indicates Energy gap values are 2.0-5.6 ev and that the material is semiconductive, which is evidence of the presence of nickel oxide. The Ftir test shows that the bonding sites for cobalt oxide are at 500-600, and the zeta Potential (ZP) test indicates that all solutions have very small values and that the material is not agglomerating and very light.

Ultrafast detection of ammonia at room temperature and subsequent electrochemical water splitting via the ionic liquid templated nano nickel oxide

In this work, biopolymers like chitosan and Bovine Serum Albumin (BSA) templated and ionic liquid (IL)-driven synthesis of crystalline NiO nanoparticles for ultrafast room temperature detection of ammonia together with its semi-empirical mechanistic details are reported. The XRD results have revealed the crystalline nature of synthesized NiO nanoparticles; the contact angle measurements for the adhesive nature of the NiO nanoparticles have been carried out and the films have been subjected to gas sensing studies by chemo-resistive method. The as-prepared BSA templated ionic liquid driven NiO based thin film sensor displays an ultrafast response for the room temperature detection of ammonia with an excellent response and recovery times of 38 and 13 s, respectively, towards a lower detection limit up to 1 ppm. The ultrafast sensing mechanism of the ammonia has been deduced with the aid of X-ray Photoelectron Spectroscopy (XPS) analysis. Furthermore, as-synthesized BSA/BSA-IL templated NiO electrodes have displayed excellent electrocatalytic water oxidation in alkaline media, with a collective water-splitting stable current density of 10 mA∙cm−2. We have observed the HOMO-LUMO gap and the Valence Band/Conduction Band (VB/CB) position from the Bredas method calculations which clarifies the highest aptitude of NiO prepared with BSA-IL template for superfast ammonia gas sensing as the CB energy is significantly lower than that of NiO synthesized via the BSA template. The dual approach of multifarious applications for the ultrafast ammonia sensing and the corresponding electrochemical water oxidation through the bio-inspired NiO-nanoparticles is in fact one of the novel applications being cited in this paper. The results highlight the grave implications of as-synthesized NiO-nanoparticles as a brilliant cost-effective gas sensor and as an effective alternative electrode for sustainable energy harvesting.

Electrochemical Activation of Nickel Oxide Incorporated Aluminum-Zinc Alloy Matrix as an Efficient Sacrificial Anode in Marine Environments

For cathodic protection of steel, the aluminium-zinc alloy sacrificial anodes incorporated with nickel oxide nanoparticles were fabricated. The metallurgical properties of Al-Zn sacrificial anodes enhanced substantially through the infiltration and uniform dispersion of nickel oxide nanoparticles into an Al-Zn matrix. Such effective and uniform presence of nano nickel oxide inside the interior mass of the anodes was characterized by electrochemical techniques. The anodes showed considerably low polarization, steady and high active open circuit potential and substantially decreased self-corrosion during galvanic exposure for prolonged periods. The presence of nickel oxide nanoparticles in the anode matrix caused effective destruction of the passive aluminia film, which facilitated enrichment of galvanic performance of the anode. The anode had high resistance against biofouling also.

PPy/NiO nanocomposite: synthesis and characterization

Polypyrrole (PPy) is one of the most stable conducting polymers and easy to synthesis. In this work, PPy and nano nickel oxide (NiO) doped PPy were prepared by the chemical oxidative polymerization method. The structure, morphology and particle size of NiO/PPy nanocomposites were investigated by FT-IR, SEM-EDX and XRD analysis respectively. From FT-IR, based on the obtained results for nano NiO doped PPy, the vibrational band at 428 cm−1 confirms the presence of NiO. The XRD pattern reveals that pure PPy is amorphous. In contrast, NiO doped PPy nanocomposite shows a crystalline structure as confirmed by the sharp peak of 2θ value, which is 43.16°. SEM microphotograph shows that the agglomeration exists in nano NiO doped PPy due to the presence of nanomaterial. The AC conductivity measurements done for n-NiOPPy exhibits a remarkable change in electrical conductivity response. The properties of pure PPy and its composites after doping are compared.

Electrolytic Generation of Nickel Hydroxide and Nickel Oxide Nanoparticles for Advanced Applications

Nano nickel hydroxides and nano nickel compounds attract great attention because it is a significant industrial material of commercial importance and applications in nickel-metal hydride batteries, supper capacitors, water treatment, etc. This investigation gives the results of electrolytic preparation of nickel hydroxide powder by anodic dissolution technique and conversion of this nickel hydroxide to nano nickel oxide via heat treatment. The obtained operating conditions for anodic dissolution of nickel substrate in saline solution were 75mA/cm2, pH 6, 3g/l. sodium chloride, 20OC, electrode gap distance 3cm, electrode reverse polarity interval time 5min. at 150rpm stirring rate. The obtained nickel hydroxide powder completely converted to nano nickel oxide at 150OC for 6hr. Morphology, particle size and crystallographic patterns of prepared nickel hydroxide and nano nickel oxide were investigated by transmission electron microscope (TEM) and the scanning advanced electronic diffraction (SAED) pattern. It was found that average particle size of synthesized nano nickel hydroxide were of nano tube shapes with smooth surface and average diameters in the range of 2.16 – 3.32 nm. Obtained results affect the design of nickel hydroxide electrodes for charge storage applications. The obtained nano nickel oxide was tested for the removal of Methylene blue dye from its solutions via adsorption. For MB solution of 100mg/l. concentration the optimum conditions for complete removal were found to be: pH 11, 100mg/l. MB, 10g/l. nano nickel oxide dose, 20OC, stirring rate 150rpm, at contact time 90min. the results shows that the adsorption capacity of MB on the nano nickel oxide surface was 25mg.g-1, and with cleaning and dryeing then reuse of the nano nickel oxide more than 12 times of MB adsorption process without any signficant change of adsorption capacity indicationg that nano nickel oxide is very good dye adsorbant.

Biosynthesis of Nano Nickel Oxide Powder Using Malva sylvestris; Evaluation of Electrocatalytic Activity for Determination of Cephalexin in Real Samples

Biosynthesis of Nano Nickel Oxide Powder Using Malva sylvestris; Evaluation of Electrocatalytic Activity for Determination of Cephalexin in Real Samples

Effect of Nano and Bulk Nickel Oxide on Biomass and Antioxidant Enzymes Production of Fennel

The production, growth, and physiological processes of plants respond differently to the varying concentrations of nanoparticles. Due to the increasing importance and application of nanoparticles, it is essential to determine the impact on plants physiological systems. Therefore, this study investigated the effect of different bulk and nano nickel oxide concentrations on biomass production and the enzymatic system of fennel. The experiment was carried out in a completely randomized design with the applications of 5 replications and 5 concentrations (0, 20, 100, 400, and 800 ppm) in the greenhouse of the Faculty of Science, Mashhad Branch, Islamic Azad University. This study analyzed various plants traits, including shoot and dry root weight and a few antioxidant enzymes. The results showed that root and shoot dry weight were not affected by the applied treatments. Furthermore, all applied levels of treatment significantly increased the activity of fennel leaf polyphenol oxidase compared to the control. The bulk treatment at 800 ppm was exempted, where the application of bulk nickel oxide and nanoparticles decreased dehydrogenase enzyme activity. In addition, the activity of guaiacol peroxidase increased under all levels of treatments except 100 ppm nanoparticles. The highest amount of phenylalanine ammonia-lyase activity was obtained under 20 ppm treatment with a 61.98% increase compared to the control method. Furthermore, nickel oxide treatments also increased MDA. The results showed that nanomaterials' toxicity, caused oxidative stress in this plant, and the differences in MDA content of leaves explained the higher toxicity of NiO nanoparticles than bulk form. Moreover, higher activity of leaf antioxidative enzymes in bulk NiO2 treatments, especially Guaiacol Peroxidase, explained the plant's higher resistance to oxidative stress.

Highly Efficient Urea Oxidation via Nesting Nano-Nickel Oxide in Eggshell Membrane-Derived Carbon

Here, we reported a strategy of using an eggshell membrane to produce hierarchically porous carbon as a low-cost substrate for synthesizing a nano-nickel oxide catalyst (C@NiO), which can effective...

Long-Chain Alkyl Surfactant Assisted Preparation of Nano-Nickel Oxide via Hydrothermal Synthesis Method

The nano-NiO was prepared by hydrothermal synthesis method, using nickel sulfate hexahydrate as raw materials, urea as precipitant, and long chain alkyl ionic liquid 1-hexadecyl-3-methyl-midazolium chloride as surfactant, respectively. X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and other analytical methods were used to characterize the particle size, the phase and microstructure, and morphology of the prepared samples. Thermal stability of the samples was studied by thermogravimetry (TG). The molecular structure of nickel oxide was analysed by making use of the Fourier transform infrared spectroscopy (FT-IR). The results show that all the precursors synthesized via hydrothermal synthesis method were converted into NiO after sintering, and the obtained nano-NiO particles have good dispersibility and regular morphology, simultaneously possessing uniform size, and high purity. The samples prepared are belong to cubic structures with an average particle size of about 5-20 nm.

In-Situ Deposition of Metal Oxides Nanoparticles in Cellulose Derivative and Its Utilization for Wastewater Disinfection.

The target of this work is to investigate and assess the utilization of the synthesized in-situ deposition of metal oxide nanoparticles such as nano-nickel oxide (nNiO), nanocopper oxides (nCuO) and nanoiron oxides (nFe3O4) in aminated cellulose (Acell), as a protected and compelling antibacterial channel of contamination from domestic wastewater. The prepared Acell and nNiO/Acell, nCuO/Acell and nFe3O4/Acell nanocomposites were characterized by field emission-scanning electron microscopy (FE-SEM), Fourier transform-infrared spectroscopy (FT-IR), energy-dispersive X-ray spectroscopy, transmission electron microscopy (TEM), selected area diffraction pattern (SAED) and X-ray diffraction techniques (XRD). TEM declared the synthesis of nNiO, nCuO and nFe3O4 with regular size of 10, 23 and 43 nm, correspondingly. The antibacterial impact of both nNiO/Acell, nCuO/Acell and nFe3O4/Acell nanocomposites was inspected against Gram-positive microorganisms (Enterococcus faecalis, Staphylococcus aureus) and Gram-negative microbes (Escherichia coli, Salmonella typhi) utilizing agar disk diffusion routes. Furthermore, the ability of the synthesized nanocomposites as sterilizers for optional domestic wastewater was studied. The data for the disk diffusion obtained revealed that nFe3O4/Acell had a greater antibacterial impact than nCuO/Acell and nNiO/Acell. In addition, the purification of domestic wastewater utilizing 1.0 mg of nFe3O4, nCuO and nNiO in 1 gm of Acell was accomplished by killing 99.6%, 94.5% and 92.0% of total and fecal coliforms inside 10 mins, respectively.

Nano nickel oxide promotes epithelial‐mesenchymal transition through transforming growth factor β1/smads signaling pathway in A549 cells

Our previous study demonstrated that nano nickel oxide (NiO) induce pulmonary fibrosis in rats and collagen excessive formation in A549 cells, which mechanism was related with the increasing transforming growth factor β1 (TGF-β1) secretion. However, it remains unclear understanding the role of TGF-β1 in collagen excessive formation. Here, we found nano NiO could directly promote epithelial-mesenchymal transition (EMT) via the TGF-β1/Smads pathway in A549 cells. First, cytotoxicity induced by nano NiO has a dose- and time-dependent manner according to methylthiaozol tetrazolium assay. Second, nano NiO led to the increased contents of type I collagen (Col-I), TGF-β1, p-Smad2, p-Smad3, alpha-smooth muscle actin (α-SMA), vimentin, and fibronectin, indicating Smads pathway activation and EMT occurence. Third, to verify whether TGF-β1 activated Smads signaling pathway and EMT occurence, A549 cells were exposed to nano NiO and TGF-β1 inhibitors (10 μM SB431542). The results showed that TGF-β1 inhibitors alleviated the nano NiO-induced cytotoxicity and Col-I excessive formation. Meanwhile, TGF-β1 inhibitors reversed the proteins expression trends of Col-I, p-Smad2, p-Smad3, α-SMA, vimentin, fibronectin, and E-cadherin. These observations suggested that EMT occurrence via TGF-β1/Smads pathway might play an important role in the collagen excessive formation induced by nano NiO in A549 cells.