scholarly journals Adsorption of Uranium (VI) from Aqueous Solutions by Amino-functionalized Clay Minerals

2019 ◽  
Vol 3 (1) ◽  
pp. 41 ◽  
Author(s):  
Victoria Tobilko ◽  
Larysa Spasonova ◽  
Iryna Kovalchuk ◽  
Borys Kornilovych ◽  
Yurij Kholodko
Keyword(s):  
Thermal Analysis ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Clay Minerals ◽  
Powder Diffraction ◽  
Nitrogen Adsorption ◽  
Layer Silicate ◽  
X Ray ◽  
Modified Montmorillonite ◽  
Adsorption Desorption

Silylation of clay minerals from Cherkasy deposit (Ukraine) montmorillonite (layer silicate) and palygorskite (fibrous silicate) was performed using organosilane (3-aminopropyl)triethoxysilane (APTES). Solvents with different polarity (ethanol, toluene) were used in synthesis. The structure of modified minerals was characterized by complex of methods (X-ray powder diffraction, Fourier transform infrared spectroscopy, nitrogen adsorption-desorption at −196 °C and thermal analysis). Studies of adsorption characteristics of APTES-modified clay minerals were carried out in relation to uranium (VI). The results indicated that modified montmorillonite and palygorskite were effective materials for water purification from UO22+.

scholarly journals Pengaruh Jumlah Polimer terhadap Karakteristik Fisik dan Pelepasan Nanopartikel Fraksi Diterpen Lakton Sambiloto - Kitosan

2020 ◽  
Vol 7 (2) ◽  
pp. 99
Author(s):  
Retno Sari ◽  
Abhimata Paramanandana ◽  
Dewi Isadiartuti ◽  
Annisa Maulidia Rahayyu
Keyword(s):  
Thermal Analysis ◽  
Fourier Transform ◽  
Differential Thermal Analysis ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Powder Diffraction ◽  
Fourier Transform Infrared ◽  
Andrographis Paniculata ◽  
X Ray

Fraksi diterpen lakton dari Andrographis paniculata Nees (sambiloto) (FDTLS) memiliki kandungan utama andrografolid. andrografolid diketahui memiliki bioavailabilitas buruk, bersifat sangat lipofilik, dan memiliki kelarutan yang rendah di dalam air. Penjebakan bahan sukar larut ke dalam polimer hidrofilik seperti kitosan dapat memperbaiki disolusi yang selanjutnya akan meningkatkan bioavailabilitas dan efektivitasnya. Tujuan penelitian ini adalah untuk meningkatkan disolusi serta mengetahui pengaruh jumlah kitosan terhadap karakteristik fisik, efisiensi penjebakan dan pelepasan FDTLS dari nanopartikel FDTLS-kitosan. Nanopartikel dibuat dengan metode gelasi ionik-semprot kering menggunakan tripolifosfat sebagai penyambung silang. Nanopartikel dibuat dengan rasio FDTLS-kitosan yang berbeda, yaitu 1:2 (FK1), 1:2,5 (FK2) dan 1:3 (FK3). Evaluasi yang dilakukan meliputi morfologi, pemeriksaan differential thermal analysis (DTA), Fourier-transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), efisiensi penjebakan, dan uji pelepasan. Nanopartikel yang dihasilkan berbentuk sferis dan FK2 mempunyai permukaan paling halus dengan entalpi paling tinggi. Difraktogram nanopartikel FDTLS-kitosan menunjukkan perubahan kristalinitas menjadi lebih amorf. Efisiensi penjerapan FDTLS dalam nanopartikel kitosan sebesar 29,01-32,69%. Hasil uji pelepasan nanopartikel menunjukkan peningkatan kecepatan FDTLS terlarut sebesar 1,6 kali dibandingkan dengan substansi FDTLS. Dari hasil penelitian dapat disimpulkan bahwa pembentukan nanopartikel dengan polimer kitosan dengan metode gelasi ionik-semprot kering dapat meningkatkan jumlah FDTLS terlarut.

Improved Crystallinity of Zinc Sulfide Nanoparticles in Aqueous Environment

2005 ◽  
Vol 879 ◽  
Author(s):  
Navendu Goswami ◽  
P. Sen
Keyword(s):  
Particle Size ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Zinc Sulfide ◽  
Structural Transformation ◽  
Powder Diffraction ◽  
Aqueous Environment ◽  
X Ray ◽  
Zinc Sulfide Nanoparticles

AbstractZinc sulfide nanoparticles, prepared employing a non-equilibrium route, are investigated for surface related effects. Water has been shown to induce a structural transformation in nanoparticles prepared this way, which is not related to their particle size. Employing Fourier transform infrared spectroscopy and x-ray powder diffraction, we show here the importance of S-H interaction in the buildup to the final ZnS structure of these nanoparticles. These particles hold promise as water sensors.

Crystallization of Aragonite from Vaterite Precursor during Various Refluxing Times

2015 ◽  
Vol 1119 ◽  
pp. 466-470 ◽  
Author(s):  
Radek Ševčík ◽  
Petra Mácová ◽  
Marta Pérez-Estébanez
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Powder Diffraction ◽  
X Ray ◽  
Gradual Transformation ◽  
Scanning Electron

CaCO3 polymorphs are intensively studied due to their importance in the nature and the widespread use in the industry as well. This work is dealing with the crystallization of aragonite from vaterite dispersion during the refluxation at 100°C. The characterization of CaCO3 polymorphs during vaterite transformation was performed with Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray powder diffraction (XRPD). The influence of the different refluxing times on the aragonite crystallization was discussed. The purest aragonite, 70.7(2) wt.%, was synthetized in the sample refluxed for 60 minutes. Prolonged refluxation strongly affected aragonite crystals with gradual transformation into calcite.

Synthesis of stoichiometric lead molybdate PbMoO4: An x-ray diffraction, Fourier transform infrared spectroscopy, and differential thermal analysis study

1996 ◽  
Vol 11 (3) ◽  
pp. 703-715 ◽  
Author(s):  
H. C. Zeng
Keyword(s):  
Thermal Analysis ◽  
Fourier Transform ◽  
Differential Thermal Analysis ◽  
Infrared Spectroscopy ◽  
Heating Rate ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Slow Heating ◽  
X Ray Diffraction ◽  
X Ray

The PbO/MoO3 system with 47%: 53%, 53%: 47%, and 50%: 50% molar ratios at various processing temperatures has been studied with x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and differential thermal analysis (DTA) methods. It is found that in addition to the crystallization of primary PbMoO4 phase, subphases such as Pb2MoO5 and PbMo2O7 are also formed. The remaining PbO and MoO3 are detected at certain stages of the thermal process due to localized powder inhomogeneity. Physical processes, such as sublimation, eutectic melting, solid to liquid, and liquid to vapor transformations are also investigated. In particular, evaporations of excessive PbO or MoO3 in the nonstoichiometric PbO/MoO3 can be correlated to thermal processing parameters. The current study has led to the following three processing guidelines to obtain stoichiometric PbMoO4: (i) for high temperature application, such as the Czochralski melt growth, it is suggested an excessive MoO3 (a few mol %) must be included and a slow heating rate should be employed; (ii) for low temperature synthesis, the stoichiometric PbO–MoO3 can be used, but with a fast heating rate; and (iii) PbO-rich PbO/MoO3 system is not recommended in PbMoO4 synthesis.

scholarly journals Influence of Impurities on the Luminescence of Er3+Doped BaTiO3Nanophosphors

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
G. D. Webler ◽  
M. J. M. Zapata ◽  
G. S. Maciel ◽  
A. Patra ◽  
J. M. Hickmann ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Barium Titanate ◽  
Powder Diffraction ◽  
Barium Carbonate ◽  
X Ray ◽  
Luminescence Efficiency ◽  
Emulsion Gel ◽  
Low Levels ◽  
Influence Of Impurities

The influence of the presence of barium carbonate (BaCO3) phase on the luminescence properties of barium titanate nanocrystals (BaTiO3) powders was investigated. Structural and optical characterizations of erbium (Er3+) doped BaTiO3synthesized by the sol-emulsion-gel were performed. Using Fourier transform infrared spectroscopy and X-ray powder diffraction, we identified the presence of impurities related to BaCO3and quantified its fraction. It was observed that the presence of BaCO3phase, even at low levels, depletes significantly the infrared-to-visible upconverted luminescence efficiency of the produced nanopowders.

Solvent-Induced Crystallization of Polyarylene Sulfide Sulfone

2015 ◽  
Vol 815 ◽  
pp. 529-533
Author(s):  
Su Ying Li ◽  
Yue Wu Gong ◽  
Sheng Ru Long ◽  
Xiao Jun Wang ◽  
Jie Yang
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Thermogravimetric Analysis ◽  
Powder Diffraction ◽  
Induction Time ◽  
Crystallization Behavior ◽  
Crystal Size ◽  
Crystalline Region ◽  
X Ray ◽  
Induced Crystallization

In this paper, N-methyl-2-pyrrolidone (NMP) induced crystallization behavior of PASS was found and studied. To study NMP induced crystallization of PASS, Differential Scanning Calorimeter (DSC), X-Ray Powder Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Thermogravimetric Analysis (TGA) were employed. The results showed that the crystal induced by NMP was consistent with precipitates obtained in solution, and was the eutectic of PASS and NMP. With the induction time increased, crystalline region continued to improve and the crystal size became bigger.

scholarly journals The Fourier transform infrared spectroscopy (FTIR) analysis for the clay mineralogy studies in a clastic reservoir

2022 ◽  
Author(s):  
Golnaz Jozanikohan ◽  
Mohsen Nosrati Abarghooei
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Clay Minerals ◽  
Mixed Layer ◽  
Evaluation Studies ◽  
Clay Mineralogy ◽  
Fourier Transform Infrared ◽  
Ftir Analysis ◽  
X Ray

AbstractThe complete characteristics knowledge of clay minerals is necessary in the evaluation studies of hydrocarbon reservoirs. Ten samples taken from two wells in a heterogeneous clastic gas reservoir formation in NE Iran were selected to conduct the transmission Fourier transform infrared spectroscopy (FTIR) tests for the clay mineralogy studies. The FTIR analysis showed that there were clear signs of clay minerals in all samples. The wavenumber region of the clay minerals in FTIR tests was detected to be 3621, 3432, 1034, and 515 cm−1 for illite, 3567, 3432, 1613, 1088, 990, 687, 651, and 515 cm−1 for magnesium-rich chlorite, 3700, 3621, 3432, 1034, 687, and 463 cm−1 for kaolinite, and 3567, 1088, 990, and 463 cm−1 for glauconite. After screening of samples by the FTIR method, the samples were then analyzed by powder X-ray diffraction (PXRD), wavelength dispersive X-ray fluorescence (WDXRF), and scanning electron microscopy (SEM). The PXRD and SEM result showed illite was by far the most common clay present. Kaolinite, magnesium-rich chlorite, and traces of smectite and the mixed-layer clays of both the illite–smectite and chlorite-smectite types were also recognized. The combination of PXRD and WDXRF results could quantify the clay abundances in the each well too. It was concluded that the FTIR analysis successfully could show the absorption bonds of all constituent clays. However, the infrared absorption spectra of mixed-layer clays overlapped those of the respective constituents of each mixed-layer minerals. This can be considered as the evidence of the usefulness of FTIR technique in the screening of the samples for the clay mineralogy studies.

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