Temat: co-precipitation - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Synthesis and characterization of hydroxyapatite/chitosan composites
Autorzy:: Szatkowski, T.
Kołodziejczak-Radzimska, A.
Zdarta, J.
Szwarc-Rzepka, K.
Paukszta, D.
Wysokowski, M.
Ehrlich, H.
Jesionowski, T.
Tematy:: hydroxyapatite
chitosan
composite
one-step co-precipitation; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/109806.pdf Link otwiera się w nowym oknie
Opis:: Hydroxyapatite (HAp)/chitosan (CS) composites were synthesized via a one-step co-precipitation method from aqueous solution, with the use of calcium chloride (CaCl2) and disodium hydrogen phosphate (Na2HPO4). CS was obtained via partial deacetylation of chitin with the use of strong sodium hydroxide solution. Composites were prepared with various HAp/CS ratios (30/70, 50/50, 70/30, 85/15) for comprehensive comparison of their properties. Fourier Transform Infrared Spectroscopy (FT-IR) analysis showed that hydrogen bonds were formed between the organic matrix and the mineral compound, confirming a successful phase interconnection. X-ray diffraction patterns were obtained, enabling examination of the crystalline properties of the composites, including HAp identification. The porous structure parameters of the composites were investigated, and morphological analysis (SEM) was performed. Differential Thermal Gravimetry (DTG) analysis of the composites indicated that the material is thermally stable up to 200 oC. Additionally, Energy Dispersive Spectroscopy (EDS) analysis of the mineral was carried out to check the Ca/P ratio, and confirmed its similarity to pure HAp.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Physicochemical properties of pseudobrookite Fe2TiO5 synthesized from ilmenite ore by co-precipitation route
Autorzy:: Mahmoud, Mohamed H. H.
Hessien, Mahmoud M.
Alhadhrami, Abdulrahman
Gobouri, Adel A.
Tematy:: ilmenite ore
pseudobrookite
Co-precipitation
nanocrystalline
magnetic properties; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/109822.pdf Link otwiera się w nowym oknie
Opis:: Pseudobrookite (Fe2TiO5) is a semiconductor with numerous potential applications. Low-grade ilmenite ore has been used as an inexpensive source of Fe and Ti for preparation of Pseudobrookite. Ilmenite was first leached with 20% hydrochloric acid for 3 h at 70°C. Co-precipitation of soluble Fe and Ti from the rich filtrate was carried out at pH ≥ 9.1 followed by calcination at different temperatures (900-1300oC) for 2 h. X-ray diffraction patterns (XRD) showed that a single-phase nanocrystalline pseudobrookite powder was produced. The pH was a critical parameter for the evolution of formation the different sizes, structural morphology, and the magnetic properties of the product. Scanning electron microscope (SEM) images showed that particles synthesized at pH 11.2 contained more agglomerations and were more porous than those synthesized at pH 9.1. As the calcination temperature increases, the Fe2TiO5 changes from a small rod-like structure to an elongated rod-like structure, and finally to interconnected aggregated crystals. The magnetization of the synthesized Fe2TiO5 was measured using a vibrating sample magnetometer (VSM) and was found steadily increase with increasing calcination temperature from 1000 (≈9 emu/g) to 1300°C (16 emu/g). Such a large saturation of magnetization might be due to the high phase purity and well-defined crystallinity of Fe2TiO5.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Synthesis and characterization of AgFeO2 delafossite with non-stoichiometric silver concentration
Autorzy:: Siedliska, K.
Pikula, T.
Chocyk, D.
Jartych, E.
Tematy:: delafossite
silver ferrite
co-precipitation
hyperfine interactions
Mössbauer spectroscopy; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/148622.pdf Link otwiera się w nowym oknie
Opis:: The simple co-precipitation method was used to prepare AgxFeO2 delafossite with non-stoichiometric silver concentration in the range of x = 0.05–1. The obtained material was investigated using X-ray powder diffraction and 57Fe Mössbauer spectroscopy at room temperature. The structural and hyperfine interaction parameters were recognized in relation with decreasing silver concentration. The study revealed that the delafossite structure of AgxFeO2 was maintained up to x = 0.9; as the range of silver concentration was decreased to 0.05 ≤ x ≤ 0.8, a mixture of AgFeO2, Fe2O3 or/and FeOOH was formed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Antibacterial activity of iron oxide nanoparticles synthesized by co-precipitation technology against Bacillus cereus and Klebsiella pneumoniae
Autorzy:: Ansari, S. A.
Oves, M.
Satar, R.
Khan, A.
Ahmad, S. I.
Jafri, M. A.
Zaidi, S. K.
Algahtani, M. H.
Tematy:: antibacterial activity
co-precipitation
iron oxide nanoparticles
Klebsiella pneumoniae
physico-chemical characterization; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/778380.pdf Link otwiera się w nowym oknie
Opis:: The present study investigates the synthesis and characterization of iron oxide nanoparticles (Fe₃ O₄ -NPs) for their antibacterial potential against Bacillus cereus and Klebsiella pneumonia by modified disc diffusion and broth agar dilution methods. DLS and XRD results revealed the average size of synthesized Fe₃ O₄ -NPs as 24 nm while XPS measurement exhibited the spin-orbit peak of Fe 2p_3/2 binding energy at 511 eV. Fe₃ O₄ -NPs inhibited the growth of K. pneumoniae and B. cereus in both liquid and soild agar media, and displayed 26 mm and 22 mm zone of inhibitions, respectively. MIC of Fe₃ O₄ -NPs was found to be 5 μg/mL against these strains. However, MBC for these strains was observed at 40 μg/mL concentration of Fe₃ O₄ -NPs for exhibiting 40–50% loss in viable bacterial cells and 80 μg/mL concentration of Fe₃ O₄ -NPs acted as bactericidal for causing 90–99% loss in viability. Hence, these nanoparticles can be explored for their additional antimicrobial and biomedical applications.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Hybrid upconverting/paramagnetic Fe3O4/Gd2O3:Er3+, Yb3+, Mg2+, Nd3+ nanoparticles : synthesis, characterization and biological applications
Autorzy:: Kamińska, Izabela
Sobczak, Kamil
Zhydachevskyy, Yaroslav
Wojciechowski, Tomasz
Minikayev, Roman
Sikora-Dobrowolska, Bożena
Lewińska, Sabina
Chojnacki, Michał
Fronc, Krzysztof
Tematy:: core/shell nanoparticles
upconversion
co-precipitation methods
HeLa tumor cells
confocal microscopy
paramagnetic; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Powiązania:: https://bibliotekanauki.pl/articles/59112946.pdf Link otwiera się w nowym oknie
Opis:: The goals of this work are to design and develop a technology for fabrication and study of multifunctional properties of core/shell nanoparticles (NPs) as magnetic/luminescent markers. The new hybrid core/shell Fe₃O₄/Gd₂O₃:1% Er³+, 18% Yb³+, 2.5% Mg²+, x% Nd³+ NPs doped with different concentrations of neodymium ions, where x = 0%, 0.5%, 0.75%, 1%, 2%, 4%, were synthesized by the co-precipitation method. The NPs were characterised using XRD, TEM, SEM, EDX, confocal microscopy and photoluminescence. Fe₃O₄ (core) consists of several 13 nm NPs. The core/shell NPs have sizes from 220 nm to 641 nm. In this latter case, the shell thicknesses were 72, 80, and 121 nm. The upconversion efficiency properties and magnetic properties of the hybrid NPs were investigated. In the core/shell NPs, the addition of Nd³+ quenches the luminescence. The magnetic response of core/shell samples is rather paramagnetic and does not differ significantly from that registered for the shell material alone. For Gd₂O₃:1% Er³+, 18% Yb³+ and Fe₃O₄/Gd₂O₃:1% Er³+, 18% Yb³+, 2.5% Mg²+, 0.5% Nd³+, at 300 K, the values of the magnetization registered at ~ 40 kOe are similar and equal to ~ 5.3 emu·g⁻¹. The survivability of the HeLa tumor cells with the presence of the core/shell NPs was investigated for 24 h. The NPs are non-toxic up to a concentration of 1000 μg·ml⁻¹ and penetrate cells in the process of endocytosis which has been confirmed by confocal microscope studies.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Copper-aluminum oxide catalysts for total oxidation of toluene synthesized by thermal decomposition of co-precipitated precursors
Autorzy:: Białas, Anna
Dudek, Barbara
Kozak, Marek
Piwowarska, Zofia
Michalik, Marek
Wach, Anna
Kuśtrowski, Piotr
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 7.

Tytuł:: Synthesis and activity evaluation of Ce-Mn-Cu mixed oxide catalyst for selective oxidation of co in automobile engine exhaust: effect of Ce/Mn loading content on catalytic activity
Autorzy:: Bilal, Yasir
Nasir, Muhammad Ali
Nasreen, Sadia
Akhter, Niaz Ahmed
Pasha, Riffat Asim
Noor, Muhammad Farhan
Tematy:: base metal oxide catalyst
catalytic converter
CO sensor
CO-precipitation
catalytic activity
katalizator tlenku metalu zasadowego
katalizator
czujnik CO
strącanie CO
aktywność katalityczna; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/101992.pdf Link otwiera się w nowym oknie
Opis:: A series of Mn-doped CeO2-CuO catalyst (CeO2-MnOx-CuO) (Ce/Mn molar ratio of 0.5, 1.0 2.0 and 3.0) were prepared using co-precipitation method for the selective oxidation of CO in automobile engine exhaust. The content of copper was 5.0 wt. % in each sample. Catalysts were installed on the automobile engine exhaust and CO amount was recorded with help of CO sensor, with and without the catalyst. The catalytic converter efficiency was estimated for each catalyst through efficiency formula. It was observed that Ce/Mn catalyst with a molar ratio of 2.0 shows the maximum efficiency (88.35%). Stability of conversion process was analyzed by plotting the CO amount with respect to time. The catalyst with Ce/Mn molar ratio of 2.0 performed the most streamline conversion process with least deviations.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The effect of magnetite nanoparticles synthesis conditions on their ability to separate heavy metal ions
Wpływ warunków syntezy nanocząstek magnetytu na ich zdolność do separacji jonów metali ciężkich
Autorzy:: Bobik, M.
Korus, I.
Dudek, L.
Tematy:: iron oxide nanoparticles
co-precipitation
heavy metals separation
adsorption
nanocząstki tlenku żelaza
chemiczne współstrącanie
metale ciężkie
separacja metali ciężkich
adsorpcja; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/205007.pdf Link otwiera się w nowym oknie
Opis:: Magnetite nanoparticles have become a promising material for scientific research. Among numerous technologies of their synthesis, co-precipitation seems to be the most convenient, less time-consuming and cheap method which produces fine and pure iron oxide particles applicable to environmental issues. The aim of the work was to investigate how the co-precipitation synthesis parameters, such as temperature and base volume, influence the magnetite nanoparticles ability to separate heavy metal ions. The synthesis were conducted at nine combinations of different ammonia volumes - 8 cm³, 10 cm³, 15 cm³ and temperatures - 30°C, 60°C, 90°C for each ammonia volume. Iron oxides synthesized at each combination were examined as an adsorbent of seven heavy metals: Cr(VI), Pb(II), Cr(III), Cu(II), Zn(II), Ni(II) and Cd(II). The representative sample of magnetite was characterized using XRD, SEM and BET methods. It was observed that more effective sorbent for majority of ions was produced at 30°C using 10 cm³ of ammonia. The characterization of the sample produced at these reaction conditions indicate that pure magnetite with an average crystallite size of 23.2 nm was obtained (XRD), the nanosized crystallites in the sample were agglomerated (SEM) and the specific surface area of the aggregates was estimated to be 55.64 m²·g^-1 (BET). The general conclusion of the work is the evidence that magnetite nanoparticles have the ability to adsorb heavy metal ions from the aqueous solutions. The effectiveness of the process depends on many factors such as kind of heavy metal ion or the synthesis parameters of the sorbent.
Nanocząstki magnetytu stanowią obiecujący materiał badań ze względu na możliwość ich praktycznego zastosowania w różnorodnych dziedzinach. Wśród wielu metod ich syntezy, jako jedną z najwygodniejszych, najmniej pracochłonnych oraz ekonomicznych, wyróżnić można chemiczne współstrącanie. Efektem metody chemicznego współstrącania są drobne nanocząstki tlenku żelaza o dużej czystości, odpowiednie do zastosowań w zagadnieniach środowiskowych. Celem pracy było badanie w jaki sposób warunki syntezy chemicznego współstrącania, takie jak temperatura reakcji czy też ilość użytej zasady wpływają na zdolności separacyjne nanocząstek magnetytu względem jonów kilku metali ciężkich. Syntezy prowadzone były w dziewięciu kombinacjach przy różnej objętości dodawanego amoniaku – 8 cm³, 10 cm³, 15 cm³ oraz temperaturze – 30°C, 60°C, 90°C. Powstałe podczas każdej z syntez tlenki żelaza były badane jako adsorbenty jonów siedmiu metali ciężkich: Cr(VI), Pb(II), Cr(III), Cu(II), Zn(II), Ni(II) and Cd(II). Ponadto próbka magnetytu zsyntezowanego w wybranych warunkach była badana przy użyciu metod XRD, SEM oraz BET. Analizując wyniki procesu sorpcji stwierdzono, iż najbardziej efektywny materiał, dla większości metali ciężkich, powstał w temperaturze 30°C przy użyciu 10 cm³ amoniaku. Dodatkowa charakterystyka powstałego w tych warunkach sorbentu wykazała, iż stanowił on czysty magnetyt o średniej wielkości ziarna 23,2 nm (XRD). Ponadto wykazano, iż pojedyncze ziarna w badanej próbce są zaglomerowane (SEM) a powierzchnia właściwa agregatów wynosi 55,64 m²/g (BET). Ogólnym wnioskiem z pracy jest dowód, iż warunki syntezy badanego adsorbentu mają wpływ na jego zdolność separacyjne względem niektórych jonów metali ciężkich.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Manual Treatment of Urban Wastewater by Chemical Precipitation for Production of Hydroponic Nutrient Solutions
Autorzy:: Correia, Tânia
Regato, Mariana
Almeida, Adelaide
Santos, Teresa
Amaral, Leonor
Carvalho, Fátima
Tematy:: urban wastewater
antarctica
chemical precipitation
CO2 capture
hydroponics; Pokaż więcej
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Powiązania:: https://bibliotekanauki.pl/articles/124562.pdf Link otwiera się w nowym oknie
Opis:: An urban wastewater treatment system was developed in Portugal for posterior in situ feasibility testing at the Bulgarian Antarctic Base, using its domestic wastewater. The aim of this system was to develop a low cost, integrated approach for wastewater treatment and production of nutrient solutions (NS) for hydroponic cultivation of lettuce (Lactuca sativa var. crispa) in Antarctic stations, or any other place where the lack of resources and logistical hardships make the wastewater treatment and reuse impractical. The wastewater treatment system consisted in manual agitation lime chemical precipitation (LCPm) and effluent natural neutralization (NN) by atmospheric CO₂ carbonation reactions (with and without air injection). The resulting effluent/NS had macronutrient values (nitrogen and phosphorous) for the hydroponic cultivation of lettuce below the values of commercial NS and a high pH (pH ≈ 8). The treatment achieved a total coliform removal rate of 100%. Before the LCPm treatment system development, several lime-based reagents were tested under different reaction pH and using mechanical agitation, to access their organic matter removal efficiency, as chemical oxygen demand (COD). The best COD removal results obtained were: commercial Ca(OH)₂ (pH 11.5 – 89%), reagent grade Ca(OH)₂ (pH 11.5 – 79%) and CaO (pH 12.0 – 64%).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Simulating the influence of doubled CO2 on the water budget over West Africa using RegCM4.7
Autorzy:: Adeniyi, Mojisola Oluwayemisi
Tematy:: water budget
doubled CO2
runoff
precipitation
evapotranspiration
West Africa; Pokaż więcej
Wydawca:: Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/1445120.pdf Link otwiera się w nowym oknie
Opis:: This paper simulates the responses of water budget components to doubled CO2 (2 × 378 ppm) concentration in the atmosphere with atmospheric and oceanic surface warming of 2°C. Simulations employed version 4.7 of the Regional Climate Model of the International Centre for Theoretical Physics (ICTP). Two six-year experiments were each repeated twice with the same model physics and parameterizations. The control experiment held the CO2 concentration at 378 ppm (no warming), while the other experiment specified doubled CO2 concentration and warming. The results showed a positive response (60-100% increase) to doubled CO2 for precipitation, runoff, and storage terms in Sierra Leone, Burkina Faso, Guinea Bissau, and the ocean area between 3 and 13°N. However, there was a negative response (up to 60%) for northern Senegal, southern Mali, and northern Nigeria. The reductions in water fluxes were observed mostly on the leeward side of the highlands. Evapotranspiration showed a negative response (1-20%) to doubled CO2 on the land north of 20°N. Burkina Faso and southern Mali responded oppositely to doubled CO2, despite their spatial proximity.
Dostawca treści:: Biblioteka Nauki

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