One Step Hydrothermal Synthesis of Nickel Doped TiO2 Nanotube (original) (raw)
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Materials Chemistry and Physics, 2010
An environmental friendly nanocrystalline Ni x TiO 2 (x = 5 and 7%) was synthesized by hydrothermal method. The requisite quantity of commercial TiO 2 and Ni(NO 3) 2 •6H 2 O was leached in alkaline medium using hydrothermal reactor at 120 • C. The anatase nanocrystalline undoped and Ni-doped TiO 2 was obtained for the first time for the functional catalysis. The reported method is effective for the synthesis of visible light driven photocatalyst and easy to scale-up. XRD results showed that the nickel was doped in the form of NiO. SEM picture shows spherical morphology to Ni-doped TiO 2 and nanofibered particle to hydrothermally treated TiO 2 samples. FESEM pictures of hydrothermally alkali treated undoped and Ni-doped TiO 2 powders afforded the particles size in the range of 50-85 nm. The DRS analysis confers visible absorption edge to Ni-doped TiO 2 at 550 nm. Ni-doped TiO 2 catalysts showed 63% more efficiency than the commercial TiO 2 to degradation of methylene blue dye under visible light irradiation.
Preparation of improved p-n junction NiO/TiO2 nanotubes for solar-energy-driven light photocatalysis
International Journal of Photoenergy, 2013
Self-organized TiO2 nanotubes (TNTs) with average inner diameter of 109 nm, wall thickness of 15 nm, and tube length of 7-10 m were loaded with nickel oxide (NiO) nanoparticles via incipient wet impregnation method. The molar concentration of Ni(NO3)2·6H2O aqueous solution varied in a range of 0.5 M-2.5 M. The samples were characterized for crystalline phase, morphology, topography, chemical composition, Raman shift, and UV-Vis diffusion reflection properties. The finding shows that the loading of NiO did not influence the morphology, structure, and crystalline phase of TNTs but it exhibited significant effect on crystallite size and optical absorption properties. Further, the solar-energy-driven the photocatalytic activity of NiO/TNTs and pure TNTs was evaluated by degrading methylene blue (MB). The results confirm that photocatalytic efficiency of NiO/TNTs is higher than that of TNTs.
2017
Ni-doped nanorod TiO2 photocatalysts were prepared by mixing a nickel solution with TiO2 powders via a modified impregnation method. In this study 5, 10, 25 mol% of Ni doping were studied. The physical properties of the Ni-doped TiO2 photocatalysts were studied by several techniques such as X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Fourier-transformed infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and UV-Vis diffused reflectance spectroscopy (DRS). XRD patterns showed that pure TiO2 sample and Ni-doped TiO2 samples were anatase phase. No diffraction patterns of Ni peaks were observed. The crystallite size of Ni-doped TiO2 samples were examined using the Scherrer equation. SEM results revealed that the pure TiO2 and Ni-doped TiO2 nanoparticles had rod-like structures. The FT-IR spectra showed the characteristic bands of the titania and hydroxyl groups on the surface of the titania. The XPS results confirmed the existence of Ni, Ti, O,...
Titanium dioxide (TiO2) nanotubes was synthesized by hydrothermal method and calcined at different temperature (300, 400, 500, 700°C) for 2 hours to study the effect of different calcination temperature on the physical properties and photocatalytic activity of TiO2 nanotubes was studied. The anatase phase structure of the TiO2 nanotubes is remained even after calcination at highest temperature studied of 700 °C. However, their morphological structure transformed from nanotubes into nanoparticles after calcination at higher temperature. Hence, reduces the photocatalytic activity of TiO2 material in degrading methyl orange due to the decreases in surface area and porosity of the materials.
Micromachines
Nitrogen-doped TiO2 nanotube arrays (N-TNAs) were successfully fabricated by a simple thermal annealing process in ambient N2 gas at 450 °C for 3 h. TNAs with modified morphologies were prepared by a two-step anodization using an aqueous NH4F/ethylene glycol solution. The N-doping concentration (0–9.47 at %) can be varied by controlling N2 gas flow rates between 0 and 500 cc/min during the annealing process. Photocatalytic performance of as-prepared TNAs and N-TNAs was studied by monitoring the methylene blue degradation under visible light (λ ≥ 400 nm) illumination at 120 mW·cm−2. N-TNAs exhibited appreciably enhanced photocatalytic activity as compared to TNAs. The reaction rate constant for N-TNAs (9.47 at % N) reached 0.26 h−1, which was a 125% improvement over that of TNAs (0.115 h−1). The significant enhanced photocatalytic activity of N-TNAs over TNAs is attributed to the synergistic effects of (1) a reduced band gap associated with the introduction of N-doping states to serv...
Different amounts of Ni-doped TiO 2 (Ni = 0.1 to 10%) powders and thin films were prepared by following a conventional coprecipitation and sol-gel dip coating techniques, respectively, at 400 to 800 • C, and were thoroughly characterized by means of XRD, FT-IR, FT-Raman, DRS, UV-visible, BET surface area, zeta potential, flat band potential, and photocurrent measurement techniques. Photocatalytic abilities of Ni-doped TiO 2 powders were evaluated by means of methylene blue (MB) degradation reaction under simulated solar light. Characterization results suggest that as a dopant, Ni stabilizes TiO 2 in the form of anatase phase, reduces its bandgap energy, and adjusts its flat band potentials such that this material can be employed for photoelectrochemical (PEC) oxidation of water reaction. The photocatalytic activity and photocurrent ability of TiO 2 have been enhanced by doping of Ni in TiO 2 . The kinetic studies revealed that the MB degradation reaction follows the Langmuir-Hinshelwood first-order reaction relationship.
2017
A Ni 2+ -TiO 2 photocatalyst, efficient and highly active in sunlight has been prepared by a simple hydrothermal method using titanium isopropoxide (TTIP) precursor. The synthesized nanoparticles (NPs) have been analysed to determine its structural, optical, morphological and compositional properties using X-ray diffraction, Raman, UV-DRS, photoluminescence, XPS, TEM and EDS. The EDS micrograph confirms the existence of Ni 2+ atoms (0.65, 1.32 and 1.60 wt.%) in the TiO 2 matrix. The average particle size obtained from TEM is 8-11 nm and is in good agreement with XRD results. Raman bands at 641.44 cm -1 , 517.42 cm -1 and 398.43 cm -1 further confirm pure phase anatase in all samples. XPS shows the substitution of Ti 4+ ions by Ni 2+ ions in the TiO 2 host lattice. The photocatalytic activity of these nanoparticles have been studied using malachite green dye under UV light, visible light and direct sunlight. The crystallite size and band gap decreases with increase in Ni 2+ concentra...
Digest Journal of Nanomaterials and Biostructures, 2023
Metal-ions doped TiO 2 nanotubes (M-TiO 2 , M=Mn,Cr,Cu,Fe and Al) were synthesized using an in-situ hydrothermal method. The XRD pattern shown metal-ions doped TiO 2 nanotubes have an anatase phase. BET analysis shows that surface area was increased from 63.38 m 2 /g to 138.44 m 2 /g. The degradation rates of undoped-TiO 2 , Mn-TiO 2 , Cr-TiO 2 , Cu-TiO 2 , Fe-TiO 2 , and Al-TiO 2 were 50%, 64%, 76%, 85%, 88%, and 93%, respectively. Al-TiO 2 showed the highest photocatalytic performance due to the smallest ionic radii, highest surface area, and smallest crystalline size. It can be seen that the degradation of 10 ppm of methylene blue solution was observed in the following order: Undoped-TiO 2 <Mn-TiO 2 <Cr-TiO 2 <Cu-TiO 2 <Fe-TiO 2 <Al-TiO 2 .
Indonesian Journal of Chemistry and Environment, 2021
This study aimed to determine the effect of energy and time hydrothermal microwave time variations on the crystal structure and N-TiO2 nanotube photocatalytic activity. The synthesis of N-TiO2 nanotube was performed with the hydrothermal microwave method. The N-TiO2 preparationwas carried out by dissolving ethylenediamine precursor in 80 ml of 96% ethanol and 3 ml TTIP which was reacted at 70 °C for 4 hours. The obtained N-TiO2 was formed into nanotubes used the hydrotermal microwave method in low temperature (180W), medium temperature (360 W), and high temperature (720 W) with time variations of 30 minutes, 1 hour, and 2 hours. The microwave hydrothermal process in this study used 10 M NaOH to form a tubular structure and 0.5 M HCl as an ion exchange. The characterization analysis performed by X-Ray Diffraction, UV-Diffuse Reflectance Spectroscopy, and blue methylene degradation. The results of this study indicate that the variations of time and energy of the microwave hydrothermal...
Energy Procedia, 2011
Nitrogen-doped TiO 2 nanomaterials were fabricated from hydrogen titanate prepared by hydrothermal method. The starting materials with difference nitrogen sources and concentration were studied. The samples were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), BET surface area, Fourier Transform infrared spectrometer (FT-IR) and UV-vis absorption spectra by UV-VIS spectroscopy. The photocatalytic activity was investigated by degradation of methylene blue aquoeus solution under visible light irradiation. The highest photocatalytic activity of nitrogen-doped TiO 2 was gotten from the sample in which 0.5M guanidine carbonate was used as nitrogen source. Compared with pure TiO 2 (from hydrothermal method) and P25-Degussa, the wavelength range of nitrogen-doped TiO 2 was shifted to visible light while pure TiO 2 and P25-Degussa were showed in ultraviolet region.