Preparation Of NiO Research Articles

Properties of Nickel Compose

This article has been to study nano-nickel (n-Ni) derivate production. Subject has been pursued formation of pure n-Ni and composed form of Ni under dimensional excuse. Anti-ferromagnetic nNi has been material of NaCl structure to confer p-type semi-conduction. Synthetic nickel nanoparticle has been produced by reduction of nickel salt in ethylene glycol (EG) in presence of sodium borohydride (NaBH4) as reducing agent. Preparation of NiO has been pursued either by heating above 400 °C or reaction of nickel powder with oxygen to give NiO or green nickel oxide formation by heating moistened nickel powder at 1000 °C, where subjective kinetic rate limitation has been dependent on addition of extraneous NiO.

Converting wastes to resource: Preparation of NiO@γ-Al2O3 sludge composite from aluminum-containing sludge for cadmium removal from wastewater

Solid sludge waste and heavy metal water pollution have attracted great interest due to the adverse impacts on the ecological environment, which remains a significant challenge to environmental protection. Herein, with the concept of converting wastes to resources, this work presents a general procedure to fabricate NiO@γ-Al2O3 sludge composite derived from aluminum-containing sludge for efficient cadmium removal. During the procedure, the unstable metal compounds were converted into chemically stable metal oxides, and the organic components in sludge are decomposed via high-temperature treatment. Then, the NiO@γ-Al2O3 sludge composite was obtained by in situ growth of NiO nanocrystals using the calcined sludge as raw materials, followed by calcination to form a porous structure. The as-obtained NiO@γ-Al2O3 sludge composite with hierarchical porosity comprises self-assembled NiO nanosheets with sizes ranging from 1 to 3 μm. Compared with raw sludge particles, the specific surface area of NiO@γ-Al2O3 sludge composite is enhanced significantly (116.27 m2/g), revealing that the preparation procedure is favorable for the improvement of the surface properties of the sludge. The cadmium adsorption results showed that the maximum cadmium adsorption capacity of the sludge composite could attain 160.12 mg/g, and cadmium removal efficiency could reach 99.9% with an optimal dose of 1.5 g/L. Meanwhile, the sludge composite showed high adsorption capacity at the neutral pH condition, which was attributed to the exchange of cadmium ions in solution with the surface protons on the adsorbent. Significantly, a simple regeneration operation was used for the desorption of cadmium ions to realize the regeneration of adsorbents, and the regenerated sludge composite can be recyclable for continuous use. This work provides a waste-to-resource strategy for resource utilization of solid waste sludge and presents an adsorbent material with high surface activity for cadmium adsorption, which may inspire the development and application of other solid waste for wastewater treatment.

Preparation of NiO / PC catalyst with plasma for cracking tar to produce flammable gas

To increase the use of lignite, the tar was pyrolyzed with pyrolysis coke (PC) to produce more combustible gases such as H2, CH4, and CO. NiO/PC catalyst with plasma was prepared, and the influence of PC and NiO/PC catalyst on flammable gas was investigated in a two-stage fixed reactor. The catalysts were characterized by SEM, BET, XPS and XRD to analyze the tar cracking mechanism. The results were: (1) PC was prepared at different heating rates, and when the heating rate reached 20 °C/min, the amount of flammable gas was 5.4 L. (2) NiO/PC catalyst was modified with plasma in three background gases withO2 being the best, mainly because of the increase of the oxygen functional groups. (3) PC was modified and calcined with plasma, and when the power reached 40 W, it produced the most combustible gas, and the volume could grow by 94.4%.

Preparation of NiO by Simple Heat Treatment Method and its Application in Photocatalytic Water Splitting

As a cocatalyst, NiO has shown a great potential in facilitating photocatalytic water splitting for hydrogen evolution. In this work, a new photocatalyst thin film (Ni/NiO/NaTaO3: La) is successfully prepared to optimize the performance of the photocatalytic water splitting. The NiO cocatalyst is prepared by a simple heat treatment method. An efficient heterojunction can be formed between NiO and NaTaO3, which is beneficial to the transmission and separation of photogenic carriers. The photocatalytic activity of Ni/NiO/NaTaO3: La is 10.83 µmol/h cm2 under high-pressure mercury lamp irradiation, which is two times higher than that of Ni/NaTaO3: La. In addition, the Ni/NiO/NaTaO3: La thin film is treated under different temperatures. It can be observed that annealing temperature has a great influence on the photocatalytic activity of Ni/NiO/NaTaO3: La thin film. When the sample annealed in 700 °C, the photocatalytic activity for water splitting is the highest, indicating the temperatures have an effect on the formation of NiO and photocatalytic efficiency. Our photocatalyst thin film (Ni/NiO/NaTaO3: La) provides sustainable photocatalysts by taking both photocatalyst stability and repeated utilization into consideration. More importantly, this work also provides a new insight into the synthesis of Ni/NiO/NaTaO3: La thin film, which has a great application prospects in the field of photocatalytic water splitting. NiO cocatalyst is prepared by a simple heat treatment method and this novel photocatalyst thin film (Ni/NiO/NaTaO3: La) is successfully prepared to optimize the performance of the photocatalyst.

Preparation of NiO and CoO nanoparticles using M2+-oleate (M=Ni, Co) as precursor

The preparation of NiO and CoO nanoparticles was reported. The dot-like NiO and flower-like CoO nanoparticles were obtained using M2+-oleate (M = Ni, Co) as precursor via thermal decomposition method. Transmission electron microscopic (TEM) images monitored the growth of NiO and CoO nanoparticles. When the reaction complex including M2+-oleate (M = Ni, Co) precursor, oleic acid and 1-octadecene was heated to the refluxing temperature (320 °C), the formed NiO and CoO nanoparticles were needle-like and very small, indicating low growth speed. However, when the reaction complex was kept refluxing for 30 min, dot-like NiO and flower-like CoO nanoparticles were observed, suggesting the accelerated growth at this refluxing stage. The difference of the morphology of the resultant NiO and CoO nanoparticles resulted from the difference of their growth mode. Selected-area electron diffraction (SAED) patterns showed the face-centered cubic structures of NiO and CoO nanoparticles. The magnetic property of the nanoparticles was studied using vibrating sample magnetometer (VSM).

Preparation of NiO–LiFeO2 solid solutions: the role of mechanical and thermal treatments

Abstract Ternary mixtures of Ni – Li2CO3 – Fe2O3 have been used as starting materials in order to prepare binary NiO – LiFeO2 solid solutions to be used as cathodic materal for molten carbonate fuel cells. By a combination of thermoanalytical techniques (Thermogravimetry and differential scanning calorimetry) and diffractometric techniques (X-ray powder diffraction) the present work deals with the study of the role played by thermal and mechanical treatment of the starting mixtures on the preparation of the final solid solutions.

Surface and subsurface oxide formation on Ni(100) and Ni(111)

Abstract The oxidation of Ni(1 0 0) and Ni(1 1 1) at elevated temperatures and large oxygen exposures, typical of the methods used in the preparation of NiO(1 0 0) films for surface studies, has been investigated by medium energy ion scattering (MEIS) using 100 keV H + incident ions. Oxide film growth proceeds significantly faster on Ni(1 1 1) than on Ni(1 0 0), but on both surfaces oxide penetration occurs to depths significantly greater than 100 A with total exposures of 1200 and 6000 L respectively. The metal/oxide interface is extremely rough, with metallic Ni extending to the surface, even for much thicker oxide films on Ni(1 1 1). On Ni(1 1 1), NiO growth occurs with the (1 0 0) face parallel to the Ni(1 1 1) surface and the close-packed 〈1 1 0〉 directions parallel. On Ni(1 0 0) the MEIS blocking curves cannot be reconciled with a single orientation of NiO(1 0 0) (with the 〈1 1 0〉 directions parallel) on the surface, but is consistent with the substantial orientational disorder (including tilt) previously identified by spot-profile analysis LEED.

Investigating magnetic proximity effects in NiO/Pd with polarized neutron reflectometry

With polarized neutron reflectometry we investigated NiO/Pd heterostructures for the presence of a magnetic proximity effect, which is expected to produce an induced ferromagnetic moment in Pd. Using a specific isotope mixture of Ni in the preparation of NiO, the chemical contrast across the Pd/NiO interface was greatly suppressed, thus enhancing sensitivity to magnetic contrast at the reflecting interface. Despite enhanced sensitivity, no evidence for a proximity effect was observed. If present, the magnetic moment per Pd atom could not be more than $0.01{\ensuremath{\mu}}_{B},$ regardless of Pd layer thickness, crystalline interface orientation, and number of NiO/Pd bilayers.

Preparation of NiO through NaNO 3–KNO 3 eutectic melt and its catalytic activity during the decomposition of polystyrene

The decomposition of basic nickel carbonate in the presence and absence of NaNO 3 (sodium nitrate)–KNO 3 (potassium nitrate) eutectic melt has been studied by employing isothermal TG and dynamic TG–DSC techniques. The rate constants for the decomposition in the presence of eutectic melt were found to be higher than when carbonate alone was heated. In both cases, nickel oxide was found to be the end product. Catalytic activities of nickel oxide obtained by the two methods were tested for their efficiency in decomposition of polystyrene (PS). It was found that at higher temperature (330 and 360°C), the nickel oxide obtained from eutectic melt was more active than that obtained by direct decomposition.