Preparation and Characterization of Nanosized Barium-Strontium Titanate Immobilized on Aluminum Oxide and its Application in Separation of Cr(III) and Cr(VI)

2010 ◽  
Vol 152-153 ◽  
pp. 1013-1016
Author(s):  
Hong Wang ◽  
Jing Yang
Keyword(s):  
Aluminum Oxide ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Sol Gel ◽  
Complete Separation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ph Values ◽  
Barium Strontium

Nanometer barium-strontium titanate based coated aluminum oxide (ABST) was prepared by the sol–gel method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectrophotometry (FTIR). Its application in speciation of Cr(III) and Cr(VI) from water were studied. The results showed that the nanometer barium-strontium titanate was immobilized on aluminum oxide firmly, becoming a new adsorbent. Two forms of chromium showed different exchange capacities at different pH values, viz. Cr (III) selectively retained at pH 10–13, whereas Cr (VI) retained at pH 1. Hence complete separation of the two forms of chromium is possible. Retained species were eluted with 5mL of 1 mol•L−1 HCl and 1 mol•L−1 NaOH. The Cr(III) and Cr(VI) concentration was measured by atomic absorption spectroscopy. The adsorbent had a promising prospect in the separation of Cr(III) and Cr(VI) in environment water.

Preparation and Characterization of Nanosized Barium-Strontium Titanate Immobilized on Aluminum Oxide and Its Application in Adsorption

2010 ◽  
Vol 26-28 ◽  
pp. 682-685 ◽  
Author(s):  
Dong Zhang ◽  
Chun Li Zhang
Keyword(s):  
Aluminum Oxide ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Composite Adsorbent ◽  
Cadmium Ions ◽  
Lead And Cadmium ◽  
Barium Strontium

Nanometer barium-stroutium titanate immobilized on aluminum oxide (ABST) was prepared by the citric acid sol–gel method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectrophotometry (FTIR). Its Pb2+ and Cd2+ adsorption properties from water were studied. Adsorption and elution were investigated under different conditions. The results showed that the nanometer barium-strontium titanate was immobilized on aluminum oxide firmly, becoming a composite adsorbent. The lead and cadmium ions were quantitatively retained at pH 5-8; their adsorption capacities of ABST were 70.28 mg•g－1 and 8.12 mg•g－1, respectively. The adsorbent of adsorped lead and cadmium ions were regenerated completely by elution with 1 mol•L－1 HNO3. The adsorbent had a promising prospect in analyticl chemistry and water treatment.

Synthesis and Characterization of Nano-Calcium Titanate-Based Coated Aluminum Oxide and its Application in Water Analysis of Cr(III) and Cr(VI) Concentration

2010 ◽  
Vol 44-47 ◽  
pp. 2136-2139
Author(s):  
Dong Zhang
Keyword(s):  
Aluminum Oxide ◽  
Sol Gel ◽  
Calcium Titanate ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Composite Adsorbent ◽  
X Ray ◽  
Ph Values ◽  
Adsorption Capability

Nano-calcium titanate-based coated aluminum oxide (ACCTO) was successfully prepared by the citrate acid sol-gel method and characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Its application in speciation of Cr(III) and Cr(VI) from water was studied. The conditions of adsorption and elution were investigated. The results show that nanometer calcium titanate could be immobilized on the aluminum oxide firmly, becoming a composite adsorbent. Two forms of chromium showed different adsorption capability at different pH values, Cr (III) selectively retained at pH 8-14, whereas Cr (VI) retained at pH≤2. So separation of the Cr(III) and Cr(VI) is possible. Retained species were eluted with 5mL of 1 mol•L-1 HCl and NaOH. The Cr(III) and Cr(VI) concentration was measured by atomic absorption spectroscopy. The adsorption agent has a promising prospect in removal or enriching and separation of Cr(III) and Cr(VI) in water.

"Synthesis and characterization of Ba0.8Sr0.2TiO3 perovskite thin films prepared by Sol Gel Technique "

2020 ◽  
Vol 7 (2) ◽  
pp. 1-11
Author(s):  
Hamed A. Gatea ◽  
Iqbal Nahi
Keyword(s):  
Thin Films ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Perovskite Structure ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Barium Strontium ◽  
Intermediate Phases ◽  
Gel Technique

"Barium strontium Titanate (BST) is a solid solution consist of BaTiO3 and SrTiO3 that mixed with suitable ratio. Barium strontium Titanate oxide (Ba0.8Sr0.2TiO3) thin films prepared by sol gel technique. Barium strontium Titanate thin films deposited on Si substrate and annealed at [400,500, 600 and 700] ºC. The characterization of BST films investigated by a different technique, the X-Ray Diffraction (XRD) and Scanning Electron Macroscopy (SEM) revealed the phases, crystal structure and surface topography of the films. XRD pattern shows tetragonal phase for Ba0.8Sr0.2TiO3 perovskite structure with many peaks for different plans. The films annealed at the different temperature that indicated intermediate phases on perovskite structure of Ba0.8Sr0.2TiO3.

Synthesis and Characterization of Immobilized Nanometer Calcium Titanate and the Application in Speciation Analysis for Chromium

2010 ◽  
Vol 129-131 ◽  
pp. 724-727
Author(s):  
Dong Zhang
Keyword(s):  
Silica Gel ◽  
Sol Gel ◽  
Speciation Analysis ◽  
Environmental Water ◽  
Complete Separation ◽  
Calcium Titanate ◽  
X Ray Diffraction ◽  
Ph Values ◽  
Adsorption Capacities

Nanometer calcium titanate immobilized on silica gel G (SGCTO) was prepared by the sol–gel method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectrophotometry (FTIR). Its application in speciation of Cr(III) and Cr(VI) from water was studied. Adsorption and elution were investigated under different conditions. The results showed that the nanometer calcium titanate was immobilized on the silica gel G firmly, becoming a new adsorbent. At normal temperature, two forms of chromium show different adsorption capacities at different pH values, that is, Cr (III) selectively retained at pH 8–14, but Cr(Ⅵ) can’t be adsorbed. Whereas Cr (VI) retained at pH 1, but Cr(Ⅲ) can’t be adsorbed. Hence complete separation of the two forms of chromium is possible. Retained Cr(III) and Cr(VI) were eluted with 1 mol•L−1 HCl and 2 mol•L−1NaOH, respectively. The Cr(III) and Cr(VI) concentration was measured by atomic absorption spectroscopy. The method was successfully applied for the speciation of chromium in environmental water samples.

scholarly journals Synthesis and characterization of nickel oxide doped barium strontium titanate ceramics

Cerâmica ◽  
2012 ◽  
Vol 58 (345) ◽  
pp. 99-104 ◽  
Author(s):  
M. Banerjee ◽  
S. Mukherjee ◽  
S. Maitra
Keyword(s):  
Nickel Oxide ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Barium Carbonate ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
X Ray Diffraction ◽  
Barium Strontium ◽  
Titanate Ceramics

Barium strontium titanate (BST) ceramics (Ba0.6Sr0.4)TiO3 were synthesized by solid state sintering using barium carbonate, strontium carbonate and rutile as the precursor materials. The samples were doped with nickel oxide in different proportions. Different phases present in the sintered samples were determined from X-ray diffraction investigation and the distribution of different phases in the microstructure was assessed from scanning electron microscopy study. It was observed that the dielectric properties of BST were modified significantly with nickel oxide doping. These ceramics held promise for applications in tuned circuits.

Physical Characterization of BST with Different (x’) Ratios

2014 ◽  
Vol 487 ◽  
pp. 106-109
Author(s):  
Nurhafizah Ramli ◽  
Zaliman Sauli ◽  
Vithyacharan Retnasamy ◽  
They Yee Chin ◽  
K. Anwar ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Roughness ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Sol Gel ◽  
Force Microscopy ◽  
Atomic Force ◽  
Fields Of Study ◽  
Barium Strontium

Nowdays Barium strontium titanate (BST) can be applied into many fields of engineering. Its properties attracted more researchers to research and apply it into many fields of study. In this work, sol-gel method of preparing barium strontium titanate (BST) has been used. This work was done with 4 different ratio of x with 4 different deposition layers. The main purpose of this work is to investigate the relation between the ratio of barium (Ba) with different deposition layer and the surface of the substrate. Atomic force microscopy (AFM) was used in whole work to investigate the crystalline structure and surface roughness of the BST thin films.

scholarly journals Impedance spectroscopy and dielectric studies of nanocrystalline iron doped barium strontium titanate ceramics

2015 ◽  
Vol 9 (2) ◽  
pp. 73-79 ◽  
Author(s):  
Reenu Jacob ◽  
Harikrishnan Nair ◽  
Jayakumari Isac
Keyword(s):  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Research Attention ◽  
X Ray ◽  
Barium Strontium ◽  
Iron Doped ◽  
Different Temperatures ◽  
Nanocrystalline Iron ◽  
Titanate Ceramics

Barium titanate compounds have great research attention due to their good electric and in some case interesting magnetic properties. The synthesis and characterization of iron doped barium strontium titanate (BSFTO) make an attempt to understand its structure and investigate electric/dielectric properties. The formation of a perovskite compound with tetragonal phase was confirmed through X-ray structural studies. Dielectric and electrical impedance properties of the sintered BSFTO ceramics were measured in the frequency range from 42Hz to 2MHz and at different temperatures (up to 600?C). It was shown that the properties of this material are highly dependent on temperature and frequency. The nature of frequency dependence of AC conductivity confirms the Jonscher?s power law. The temperature dependence of DC conductivity obeys the Arrhenius behaviour.

scholarly journals Study of the Layer-Type BST Thin Film with X-ray Diffraction and X-ray Photoelectron Spectroscopy

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 578
Author(s):  
Agata Lisińska-Czekaj ◽  
Dionizy Czekaj
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Photoelectron Spectroscopy ◽  
Chemical Compositions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Barium Strontium ◽  
Bst Thin Film

In the present paper, results of X-ray photoelectron studies of electroceramic thin films of barium strontium titanate, Ba1−xSrxTiO3 (BST), composition deposited on stainless-steel substrates are presented. The thin films were prepared by the sol-gel method. A spin-coating deposition of BST layers with different chemical compositions was utilized so the layer-type structure of (0-2) connectivity was formed. After the deposition, the thin-film samples were heated in air atmosphere at temperature T = 700 °C for 1 h. The surfaces of BST thin films subjected to thermal treatment were studied by X-ray diffraction. X-ray diffraction measurements confirmed the perovskite-type phase for all grown thin-film samples. The oxidation states of the elements were examined by the X-ray photoelectron spectroscopy method. X-ray photoelectron spectroscopy survey spectra as well as high-resolution spectra (photo-peaks) of the main metallic elements, such as Ti, Ba, and Sr, were compared for the layer-type structures, differing in the deposition sequence of the barium strontium titanate layers constituting the BST thin film.

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