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    Wyświetlanie 1-6 z 6
    Tytuł:
    Research on deposition of silver nanoparticles at the cellulose/NaNO3 electrolyte interface
    Autorzy:
    Janusz, Władysław
    Kowalska, Klaudia
    Skwarek, Ewa
    Powiązania:
    https://bibliotekanauki.pl/articles/24085716.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    nanomaterials
    silver nanoparticles
    cellulose
    biocomposites
    Opis:
    Currently the research on silver nanoparticles is of great demand owing to their antibacterial properties. One of the possibilities is the study of the silver deposition on the cellulose fibers, and more specifically of the silver nanoparticles and cellulose particles. The research was aimed at obtaining silver nanostructures by reducing ions with formaldehyde and then stabilizing them with the Pluronic solution. A suspension system containing cellulose fibers and silver nanoparticles was prepared in the basic electrolyte NaNO3. There were analyzed the following makes: pH of solutions, grain distribution and zeta potential ζ. Ag nanoparticles are largely applied in medicine, pharmacy, cosmetology and textile industry. Great interest in the nanostructures allows for developing knowledge about them, and thus creating the possibility of further improvement of their properties for subsequent applications.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 4; art. no. 173554
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cellulase as a new phosphate depressant in dolomite-phosphate flotation
    Autorzy:
    Yehia, A.
    Khalek, M. A.
    Ammar, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/110349.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation
    cellulose
    cellophane
    dolomite
    oleic acid
    Opis:
    Recently, many research efforts have been made to reduce the magnesium content in the phosphate concentrate to meet the requirement for phosphoric acid production and other applications. A bioprocessing technique is among these efforts. However, this paper was devoted to study the use of cellulase enzyme as a new phosphate depressant during fatty acid flotation of a calcareous phosphate rock. The flotation behavior of collophane and dolomite as single minerals using oleic acid as a collector and cellulase enzyme as the phosphate depressant was investigated in details. The results from single mineral flotation tests were discussed based on FTIR and zeta potential measurements to find out the mechanism of cellulase depression of phosphate. The findings from the single minerals tests were used to develop a selective flotation process for recovery of phosphate minerals from the natural phosphate ore. The flotation experiments were carried out to apply this new process using the calcareous phosphate ore. Under the optimum flotation conditions, 0.04% cellulase and 0.5 mM oleic acid, a phosphate concentrate containing 0.89% MgO with a P2O5 recovery of 75% was obtained from the phosphate ore containing 2.2% MgO.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1092-1104
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and characterization of new polymer sorbents based on EGDMA and cellulose
    Autorzy:
    Podkościelna, Beata
    Wawrzkiewicz, Monika
    Goliszek, Marta
    Lipke, Agnieszka
    Chabros, Artur
    Powiązania:
    https://bibliotekanauki.pl/articles/2146890.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cellulose
    EGDMA
    polymer
    sorption
    bio-filler
    Opis:
    In this article bio-based and cheap microcrystalline cellulose was used as a modificator for the synthesis of polymeric sorbents based on ethylene glycol dimethacrylate (EGDMA) and styrene (St). Cellulose was previously modified with methacrylic anhydride. The polymerization reaction was carried out in an aqueous medium with the addition of polyvinyl alcohol using the suspension polymerization technique. The chemical structure of the obtained sorbents was confirmed by ATR-FTIR analysis. In the next stage of the research, the materials were tested for their sorption capacity to remove organic dyes of acidic and basic type from aqueous solutions.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 2 (Special issue - selected papers conference: Physicochemistry of interfaces - instrumental methods); art. no. 147466
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dispersion of sodium phytate on muscovite and the implications for arsenopyrite flotation
    Autorzy:
    Zou, Dan
    Wang, Zhen
    Zhao, Kaile
    Xu, Ying
    Powiązania:
    https://bibliotekanauki.pl/articles/2175449.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cassiterite
    chlorite
    sodium oleate
    carboxymethyl cellulose
    selective inhibition
    Opis:
    The effective flotation separation of sulfides and sliming silicate minerals is always a difficult problem. In this paper, the selective flotation of arsenopyrite from muscovite was studied by using sodium phytate (SP) as dispersant, and the mechanism was investigated through SEM/EDS, zeta potential, FTIR and XPS measurements. Single mineral flotation results showed that with the increasing isoamyl xanthate (IAX) dosage the recovery of arsenopyrite increased, until 8×10−5 mol/L IAX (79.40% recovery, pH=7), after that it decreased slightly. While muscovite floated poorly at any IAX concentration. For the mixed minerals, arsenopyrite recovery was only 54.63% while that of muscovite was 42.70%, which was attributed to the coverage of muscovite on arsenopyrite surface. When 6×10−5 mol/L SP was added into the mixed minerals system, the recovery of arsenopyrite recovered to 68.26% while that of muscovite was 8.48% (approximate the value of the single mineral). SEM/EDS results showed that SP could disperse muscovite and prevented its coverage on arsenopyrite surface. Zeta potential results showed that the electrokinetic potential of muscovite and arsenopyrite decrease from -26.60mV to -39.01 mV and from -26.90 mV to -27.84 mV at pH=7, respectively. It was obvious that the negatively charged phytate ions selectively adsorbed on the surface of muscovite. FTIR and XPS resulted co-proved the chemisorption of SP with active sites on muscovite while arsenopyrite spectrum did not change significantly, which was consistent with flotation and zeta potential results. The selective adsorption of SP on muscovite compared to arsenopyrite was responsible for the effective separation of them.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 154951
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flotation separation of cassiterite and chlorite using carboxymethyl cellulose as a depressant
    Autorzy:
    Hu, Yang
    Ying, Luo Hong
    Zhang, Ying
    Wei, Lu Kuan
    Hao, Guan Zhen
    Powiązania:
    https://bibliotekanauki.pl/articles/2175422.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cassiterite
    chlorite
    sodium oleate
    carboxymethyl cellulose
    selective inhibition
    Opis:
    The nature and mechanism of interaction between carboxymethyl cellulose (CMC) with cassiterite (and chlorite surfaces) and their effects on the flotation separation process of cassiterite (from chlorite) were investigated by micro-flotation tests, surface adsorption experiments, zeta potential measurements, solution chemical calculation, infrared spectroscopy, and X-ray photo-electron spectroscopy (XPS). The results from single mineral tests revealed that CMC exhibited good selective inhibition effects with cassiterites and chlorites. When the dosage was 12.5 mg/L at pH 8, cassiterite and chlorite recovery was 92.2% and 6.3%, respectively. The artificial mixed ore test revealed that the flotation separation effect was the best when the dosage of CMC was 6.5 mg/L. Cassiterite used during the studies was 75.1% pure. The recovery was 82.8%. The interaction between CMC and the cassiterite surface led to a shift in the zeta potential toward the negative direction. CMC was weakly adsorbed on the cassiterite surface. There was no significant impact on the subsequent collection of sodium oleate. The concentration of C atom increased post interaction, and the potential shifted toward the negative direction. Characteristic CMC peaks were observed at this point. Hydrogen bonds and weak chemisorption interactions between CMC and chlorite affected the interaction between sodium oleate and the chlorite surface. It also affected the flotation results. The cassiterite and chlorite were separated effectively.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 155141
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Membranes obtained on the basis of cellulose acetate and their use in removal of phenol from liquid phase
    Autorzy:
    Przybył, Joanna
    Bazan-Wozniak, Aleksandra
    Nosal-Wiercinska, Agnieszka
    Pietrzak, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/2146950.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cellulose acetate membrane
    phase inversion
    physical and chemical properties
    surface
    chemistry
    phenol removal
    Opis:
    The membranes based on cellulose acetate (CA) were obtained by the method of phase inversion and used for removal of phenol (in concentrations of 15 and 25 mg/L) from liquid phase. To differentiate the hydrophilic properties of the membrane surfaces, different amounts of cellulose acetate (14 and 18 wt. %) and polyvinylpyrrolidone as a pore-generating agent (PVP, 1, 2, 3 or 4 wt. %) were used. The membranes were characterised by determination of their porosity, equilibrium water content, wetting angle and content of surface oxygen functional groups. After the application of membranes to phenol removal, the following parameters characterising the process were determined: permeability, membrane resistance, coke resistances, pore resistances, total filtration resistance and flux recovery ratio. The membranes were found to show higher effectiveness in phenol removal from a solution of the initial concentration 15 mg/L, and more effective were the membranes with higher contents of cellulose acetate. On the surface of the membranes the oxygen functional groups of acidic nature are dominant, both before and after filtration. The membranes of higher contents of cellulose acetate show higher resistances.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 2; art. no. 144174
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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