Simple synthesis, characterization and investigation of photocatalytic activity of NiS2 nanoparticles using new precursors by hydrothermal method (original) (raw)
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A facile chemical synthesis of nanoflake NiS2 layers and their photocatalytic activity
RSC Advances, 2022
A single-phase and crystalline NiS 2 nanoflake layer was produced by a facile and novel approach consisting of a two-step growth process. First, a Ni(OH) 2 layer was synthesized by a chemical bath deposition approach using a nickel precursor and ammonia as the starting solution. In a second step, the obtained Ni(OH) 2 layer was transformed into a NiS 2 layer by a sulfurization process at 450 C for 1 h. The XRD analysis showed a single-phase NiS 2 layer with no additional peaks related to any secondary phases. Raman and X-ray photoelectron spectroscopy further confirmed the formation of a single-phase NiS 2 layer. SEM revealed that the NiS 2 layer consisted of overlapping nanoflakes. The optical bandgap of the NiS 2 layer was evaluated with the Kubelka-Munk function from the diffuse reflectance spectrum (DRS) and was estimated to be around 1.19 eV, making NiS 2 suitable for the photodegradation of organic pollutants under solar light. The NiS 2 nanoflake layer showed photocatalytic activity for the degradation of phenol under solar irradiation at natural pH 6. The NiS 2 nanoflake layer exhibited good solar light photocatalytic activity in the photodegradation of phenol as a model organic pollutant.
Journal of the Korean Ceramic Society, 2012
To improve the visible-light induced photocatalytic application performances of TiO 2 , in this study, the NiS 2 modied TiO 2 composites were prepared by two methods: hydrothermal method and sol-gel method. The composites were denoted as hs-NiS 2 /TiO 2 , and sg-NiS 2 /TiO 2 and characterized by XRD, UV-vis absorbance spectra, SEM, TEM, EDX, and BET analysis. The photocatalytic activities under visible light were investigated by the degradation of methyl orange (MO). The photodegradation rate of methyl orange under visible light with NiS 2 /TiO 2 composites was markedly higher than that of pure TiO 2 , and the effect of hs-NiS 2 /TiO 2 composites was better than that of sg-NiS 2 /TiO 2. The results indicate that the hydrothermal process could partly inhibit the agglomeration of NiS 2 /TiO 2. Thus, the dispersion of nanoparticles was improved, and that the promoting effect of NiS 2 could extend the light absorption spectrum toward the visible region.
Preparation and characterization of Cu and Ni sulfides nanoparticles
In the present work we aimed to prepare two metal sulfides nanoparticles [copper monosulfide (CuS) and nickel monosulfide (NiS)] using two different sulfur sources (Potassium N 0-[4-(N 0-dithiocarboxy-hydra zino)-4-oxo-butyryl]-hydrazine carbodithionate (I) and thiourea (II)) by a simple chemical method in an aqueous ethanolic solution. The effect of the used sulfur source on the optical and structural properties of the prepared metal sulfides was investigated. The synthesized sulfides were characterized using X-ray diffraction (XRD), UV-visible spectrophotometry, Transmission Electron Microscope (TEM) and elemental analysis. The yield, lattice parameters, crystallite sizes, microstrains and the band gap energy of the prepared CuS and NiS nanoparticles were evaluated and compared. Using the organic salt (I) leads to obtaining single phase structure of CuS and NiS, while using thiourea lead to obtaining mixed phases structure. By using the organic salt (I) we obtained CuS nanoparticles having greater potential for solar cell applications and NiS nanoparticles very interesting for photo catalysis applications.
Nanostructured Nickel Sulfides with Different Stoichiometries Prepared by Mechanochemical Synthesis
2018
By reactions between nickel and sulfur, products with different stoichiometries can be obtained, from the nickel rich compounds like Ni3S2, over NiS to sulfur rich compounds like Ni3S4 and NiS2. Nickel sulfides have been recently used in many applications, like solar cell materials, catalysts and cathode material for lithium batteries. In this paper, we present the synthesis of different nanosized nickel sulfides by high – energy milling of nickel powder with elemental sulfur in different molar ratios, using milling times between 1h and 8h. The products were characterized by X-ray powder diffraction, TEM including EDX analysis, elemental analysis and UV – Vis spectroscopy. Following products have been obtained in good yield: by milling a Ni : S mixture in molar ratio 1: 1, NiS1.03 was obtained after 8h milling time. Using a Ni : S mixture in molar ratio 1 : 2, NiS2 was obtained after 8h. Finally, from a Ni : S = 3 : 2 mixture, nanosized Ni3S2 can be obtained after 2h.
Applied Nanoscience, 2020
In the present work, two different phases of nickel sulphide (β-NiS and NiS 2) were successfully synthesized via facile hydrothermal route. The physical and chemical characterizations such as X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy confirms formation of β-NiS and NiS 2. Mesoporous caterpillar and cabbage-like nanostructures were observed in FESEM image with enlarged specific area 247.22 m 2 /g and 251.47 m 2 /g, respectively. Due to large surface area of the synthesized β-NiS and NiS 2 nanoparticles, bandgap was found to be reduced as 0.98 eV and 0.74 eV, respectively, than the bulk NiS. Charge transfer characteristics were examined by electrochemical impedance spectroscopy (EIS) technique; caterpillar-like nanostructures (β-NiS) has lowest charge transfer resistance 2.91 Ω, due to its unique structure. Cyclic Voltammetry (CV) analysis reveals that the synthesized β-NiS and NiS 2 nanoparticles show that the charge storage mechanism is non-Faradaic. Cabbage-like β-NiS nanoparticles show maximum areal capacitance 14.24 F cm −2 in 1 M LiOH electrolyte and show 89% cyclic stability over 1000 cycles. The electrocatalytic performance, such as high areal capacitance and lower charge transfer resistance indicate that the synthesized β-NiS and NiS 2 nanoparticles facilitate fast ion diffusion during redox processes.
Chalcogenide Lett, 2010
Hierarchical nanostructureds of β-NiS were successfully prepared by hydrothermal treatment of Ni(NO 3 ) 2 .6H 2 O and thioglycolic acid (TGA) at 180 • C. The as prepared β-NiS hierarchical nanostructureds were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet-visible (UV-vis) absorption spectroscopy, photoluminescence (PL) spectroscopy and Fourier transform infrared (FT-IR) spectra. The hierarchical nanostructureds, with an average diameter of ~600 nm, were composed of short nanorods with a diameter of ~30 nm and a length of about 150 nm. On the basis of the experimental results and corresponding literatures, a possible growth mechanism of the NiS hierarchical nanocrystals is discussed. The obtained products have relatively high surface area, which favors the application in catalysis.
Synthesis and Characterization of Nanocrystalline Nis- Sio 2 nanoparticles
A Coherent procedure for the Concoction of Nickel Sulphide-Silicon Dioxide (NiS-SiO 2) Nanoparticles from Nickel Chloride, Sodium Sulphide and Silicon Dioxideby nanocrystalline Nickel Sulphide-Silicon Dioxide (NiS-SiO 2) can be used as catalystand a variety of inventive methods have been done to control growth of shape and size of NiS-SiO 2 Crystals. The worldwide usage, larger scale synthesis, higher yields and shorter reaction times are the advantages of the present method.
Synthesis of nickel and cobalt sulfide nanoparticles using a low cost sonochemical method
Heliyon, 2017
Nickel and cobalt sulfides are promising materials in different cutting-edge research areas like solar cells, supercapacitors, catalysts, and electrode materials. Nickel and cobalt sulfides with various stoichiometries have been synthesized sonochemically from Ni(CH 3 COO) 2 • 4H 2 O, Co(CH 3 COO) 2 • 2H 2 O and different sulfur precursors using a direct immersion ultrasonic probe. The products were characterized by X-ray powder diffraction, transmission electron microscopy (TEM) including EDX analysis, IR and UV-Vis spectroscopy and elemental analysis. Following products have been obtained: NiS, Ni 3 S 4 , CoS 1.097 and Co 9 S 8 , with average crystallite sizes in the range 7−30 nm. Effects of different reaction conditions on the size, morphology and optical band-gap energy were evaluated. Optical band-gap energies in the range 3.3 eV−3.8 eV were observed for the obtained nanoparticles.
Superlattices and Microstructures, 2013
Two methods of thermal decomposition and hydrothermal routes were applied for synthesis of nickel sulfides of new precursor [Ni(TSC) 2 ]Cl 2 (TSC = thiosemicarbazide) and compared two methods with each other. Also another method by direct putting a mixed aqueous solution composed of NiCl 2 Á6H 2 O and TSC (H 2 NNHCSNH 2) into an autoclave without presence of any surfactants was examined to investigate the morphology of products. The effect of the reaction temperature on phase and morphology of as-synthesized products was investigated. The products were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), ultraviolet-visible spectroscopy (UV-Vis) and photoluminescence spectroscopy (PL). Magnetization measurement indicates that NiS samples show a weak ferromagnetic behavior maybe due to nano-size effect.