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    Wyświetlanie 1-8 z 8
    Tytuł:
    Weryfikacja metodyki badawczej dotyczącej oznaczania sodu w wodach podziemnych z zastosowaniem techniki emisyjnej spektroskopii atomowej, w okresie wiosennym i zimowym
    Verification of the research methodology for the determination of sodium in groundwater using the atomic emission spectroscopy technique, in spring and winter
    Autorzy:
    Zielińska, Amelia
    Powiązania:
    https://bibliotekanauki.pl/articles/2175620.pdf
    Data publikacji:
    2021
    Wydawca:
    Poltegor-Instytut Instytut Górnictwa Odkrywkowego
    Tematy:
    wody podziemne
    jony sodu
    emisyjna spektrometria atomowa
    groundwater
    sodium ions
    atomic emission spectrometry
    Opis:
    W artykule przedstawiono wyniki monitorowania zawartości jonów sodu w wodach podziemnych w zależności od pory roku (wiosna, zima), z dwóch rodzajów studni: kopanej oraz głębinowej, Scharakteryzowano punkty poboru próbek. Opracowano metodykę badawczą na podstawie normy PN-ISO 9964-3:1994, którą stosowano do oznaczania zawartości jonów sodu.
    The paper presents the results of monitoring sodium content in groundwater, depending on the season (spring, winter) from two types of wells: dug and deep well. Sampling points were characterized. The research methodology was developed on the basis of the PN-ISO 9964-3:1994 standard, which was used to determine the content of sodium ions.
    Źródło:
    Górnictwo Odkrywkowe; 2021, 62, 4; 28--36
    0043-2075
    Pojawia się w:
    Górnictwo Odkrywkowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetics of the continuous reaction crystallization of barium sulphate in BaCl2 - (NH4)2SO4 - NaCl - H2O system - neural network model
    Autorzy:
    Piotrowski, K.
    Koralewska, J.
    Wierzbowska, B.
    Matynia, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/778848.pdf
    Data publikacji:
    2009
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    siarczan baru
    jony sodu
    sole pohartownicze
    hartowanie stali
    chlorek baru
    kinetyka krystalizacji
    barium sulphate
    sodium ions
    used quenching salts
    steel hardening
    barium chloride
    reaction crystallization kinetics
    population density distribution
    chemical neutralization
    solid waste utilization
    neural network model
    Opis:
    One of the main toxic components of post quenching salts formed in large quantities during steel hardening processes is BaCl2. This dangerous ingredient can be chemically neutralized after dissolution in water by means of reaction crystallization with solid ammonium sulphate (NH4)2SO4. The resulting size distribution of the ecologically harmless crystalline product - BaSO4 - is an important criteria deciding about its further applicability. Presence of a second component of binary quenching salt mixture (BaCl2-NaCl) in water solution, NaCl, influences the reaction-crystallization process kinetics affecting the resulting product properties. The experimental 39 input-output data vectors containing the information about the continuous reaction crystallization in BaCl2 - (NH4)2SO4 - NaCl - H2O system ([BaCl2]RM = 10-24 mass %, [NaCl]RM = 0-12 mass %, T = 305-348 K and τ = 900-9000 s) created the database for the neural network training and validation. The applicability of diversified network configurations, neuron types and training strategies were verified. An optimal network structure was used for the process modeling.
    Źródło:
    Polish Journal of Chemical Technology; 2009, 11, 4; 13-19
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence and mechanism of Zn2+ on fluorite/calcite in sodium hexametaphosphate flotation system
    Autorzy:
    Ruitao, Liu
    Dan, Liu
    Ruofan, Sun
    Daqian, Wang
    Wenkang, Zhang
    Yuebing, Liu
    Shuming, Wen
    Powiązania:
    https://bibliotekanauki.pl/articles/2175451.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    fluorite
    calcite
    sodium hexametaphosphate
    flotation
    metal ions
    Opis:
    Fluorite and calcite have similar surface properties and natural floatability, so their flotation separation has always been a problem faced by the beneficiation industry. The key to flotation separation is the choice of depressants. Sodium hexametaphosphate (SHMP) has a good effect on fluorite calcite selective inhibition. In this paper, the effects of Zn2+ on the selective inhibition of SHMP in the flotation process of fluorite and calcite were studied through single mineral and artificial mixed mineral flotation experiments. Solution chemical calculation, X-ray photoelectron spectroscopy (XPS), Fourier Transform Infrared spectroscopy (FT-IR) and Time of Flight Secondary Ion Mass Spectrometry (ToF-SIMS) analyses investigated the mechanism of action of Zn2+, which had the most significant negative effect on the selective inhibition of SHMP. The results show that the main components of SHMP inhibiting minerals are HPO42- and H2PO4-, which can react with Ca active sites on the mineral surface to form hydrophilic Ca(H22PO4)2 and CaHPO4, while Zn2+ The presence of HPO42- in solution resulted in the formation of stable ZnHPO4 complexes, thereby weakening the inhibitory effect of SHMP on minerals.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 151676
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Activation of quartz flotation by Cu2+, Ni2+ in the sodium ethylxanthogenate (EX) system
    Autorzy:
    Liu, Yang
    Tong, Xiong
    Xie, Rui-Qi
    Xie, Xian
    Song, Qiang
    Fan, Pei-Qiang
    Powiązania:
    https://bibliotekanauki.pl/articles/24085981.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    quartz
    flotation
    ions activation
    sodium ethylxanthogenate
    adsorption mechanism
    Opis:
    During the flotation of metal sulfide minerals, due to the interference of unavoidable ions, the quartz also partially floats in some cases. The studies on the mechanism of quartz being activated and floating up are still insufficient. In this study, the influence of the Cu2+ and Ni2+ unavoidable ions on the floatation of quartz was studied by micro-flotation experiments, adsorption detection, zeta potential measurement, solution composition calculation, infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) analyses, and atomic force microscopy (AFM) observation. This provides a theoretical reference for further understanding the mechanism of sodium ethylxanthogenate and quartz surface, as well as the development of a new quartz depressant. The results of flotation showed that after activation by Cu2+ (1×10-4 mol/dm3) and Ni2+ (5×10-5 mol/dm3), the quartz was captured by sodium ethylxanthogenate (EX: 1.4×10-4 mol/dm3) under alkaline conditions (pH=10), while the best recoveries were obtained as 80% and 43%, respectively. The results of adsorption and zeta potential measurements showed that the precipitation rate of Cu2+ was greater than that of Ni2+ under alkaline conditions. Additionally, both Cu2+ and Ni2+ electrostatically adsorbed on the quartz surface and changed the zeta potential of quartz. The solution composition calculation further showed that Cu(OH)+, Cu(OH)2(s), and Ni(OH)+, Ni(OH)2(s) were the main components in the solution under alkaline conditions. The FT-IR and XPS analyses and AFM observations demonstrated that Cu and Ni species adsorbed on O atoms on the quartz surface, providing active sites for EX adsorption, and EX combines with Cu and Ni species on the quartz surface to generate -O-Cu-EX and -O-Ni-EX complexes. Finally, the quartz floated up due to the formation of hydrophobic products and firm adsorption.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 166368
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanism of Ca2+/Fe3+-based synergistic activation of quartz
    Autorzy:
    Liu, Rongxiang
    Yang, Zhanfeng
    Li, Jie
    Li, Qiang
    Wang, Zhenjiang
    Luo, Xiaofeng
    Powiązania:
    https://bibliotekanauki.pl/articles/2200345.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    quartz
    flotation
    co-activation
    metal ions
    sodium dodecyl sulfonate
    Opis:
    Although the flotation behaviors of iron concentrate and quartz are significantly different, quartz is the primary factor that affects the quality of iron concentrate. The flotation mechanism of quartz in the presence of mixed cationic Ca2+/Fe3+-co-activated SDS catcher was studied by conducting flotation tests with pure quartz mineral. The solution chemical calculation method, zeta potential calculation method, Fourier transform infrared (FT-IR) spectroscopy technique, X-ray photoelectron spectroscopy (XPS) technique, and other techniques were used to conduct the studies. The results showed that the maximum Ca2+/Fe3+-based synergistic activation of the flotation recovery process could be achieved in a certain range of pH values when three different activators were added sequentially. Analysis of the zeta potential values revealed that the Ca2+/Fe3+-activated quartz surface improved the extent of positive electricity generated and enhanced the SDS adsorption ability of the quartz surface. Results obtained using the FT-IR technique revealed that Ca2+/Fe3+ exerted a synergistic effect, and the adsorption process exploited the single oxygen bond interactions in the monovalent hydroxyl complex Ca(OH)+ and the double oxygen bond interactions in the Fe(OH)3 precipitates. Results obtained using the XPS technique revealed that the synergistic effect exerted by Ca2+/Fe3+ was significantly stronger than that exerted by Ca2+ or Fe3+ alone. The stable Fe-based six-membered chelate ring was formed on the surface of quartz when Fe3+ was the activator, and the chain-like Ca-based complex was formed when Ca2+ was the activator. The adsorption process on the surface of quartz proceeded following chemical as well as physical adsorption pathways. The results revealed that Ca(OH)+ and Fe(OH)3 played prominent roles during the activation of quartz surfaces in the presence of Ca2+/Fe3+.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 1; art. no. 162262
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of sodium trithiocarbonate for remove of chelated copper ions from industrial wastewater originating from the electroless copper plating process
    Zastosowanie tritiowęglanu sodu do usuwania chelatowanych jonów miedzi ze ścieków przemysłowych pochodzących z procesu bezprądowego miedziowania
    Autorzy:
    Thomas, M.
    Zdebik, D.
    Białecka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/205019.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    copper ions
    chelated copper ions
    complexing compounds
    industrial wastewater
    precipitation of copper
    sodium tartrate
    potassium tartrate
    sodium trithiocarbonate
    jony miedzi
    chelatowane jony miedzi
    związki kompleksujące
    ścieki przemysłowe
    wytrącanie miedzi
    winian sodowy
    winian potasowy
    tritiocarbonat sodu
    Opis:
    The possibility of chelated copper ions removal from wastewater from the production of printed circuit boards using Na2CS3 as a precipitant agent has been presented. The use of Na2CS3 (pH 9–9.5, FeCl3 1 mL/L, E= +82 mV) enabled successful precipitation of the complexed Cu(II) ions from wastewater (Cu 0.85 mg/L) containing potassium and sodium tartrate (KNaC4H4O6) as a complexing agent. The use of higher doses of Na2CS3 reduced the copper content to 0.05 mg/L (pH 9–9.5, FeCl3 1 mL/L, E= -156 mV). Application of Response Surface Methodology (RSM) allowed for the analysis and evaluation of the impact of the various independent parameters (pH, Fe(III) coagulant dose and 44.26% Na2CS3 dose) on the concentration of Cu(II) in treated wastewater. The lowest values of copper concentration (0.05, 0.02 and 0.03 mg/L) in the treated wastewater was obtained in the three experiments when an alkaline medium (pH 9.5 and 10) and higher concentration of Na2CS3 (0.23 and 0.28 mL/L) were used. The use of Na2CS3 solution under optimal process conditions (pH 9–9.5, E< +5 mV, FeCl3 0.5–1 mL/L, Na2CS3 0.28 mL/L), allows for almost complete precipitation of complexed copper ions(II) (Cu≤0.05 mg/L), most probably in the form of a brown solid Na2CS3.
    Celem przedstawionych badań było zweryfikowanie możliwości strącania Cu(II) ze ścieków pochodzących z procesu bezprądowego miedziowania, zawierających KNaC4H4O6 jako związek kompleksujący Cu(II), przy zastosowaniu Na2CS3. Przedstawiono możliwość usuwania Cu(II) ze ścieków pochodzących z produkcji obwodów drukowanych przy zastosowaniu Na2CS3 jako odczynnika strącającego. Zastosowanie Na2CS3 przy pH 9–9,5 w obecności koagulantu żelazowego (Fe(III)), umożliwiło skuteczne strącenie skompleksowanych jonów Cu(II) ze ścieków zawierających winian sodu i potasu (KNaC4H4O6), jako związek kompleksujący. Zastosowanie metody powierzchni odpowiedzi (Response Surface Methodology, RSM) pozwoliło na analizę i ocenę wpływu poszczególnych parametrów niezależnych (pH, dawka koagulantu żelazowego, dawka 44,26% Na2CS3) na stężenie miedzi w ściekach oczyszczonych
    Źródło:
    Archives of Environmental Protection; 2018, 44, 2; 32-42
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of Pb(II) ions from aqueous solution using complexation-ultrafiltration
    Autorzy:
    Şahin, D.
    Tascıoglu, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/779180.pdf
    Data publikacji:
    2018
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Ligand-modified micellar-enhanced ultrafiltration
    LM-MEUF
    Pb2+ ions
    dithizone
    DZ
    sodium dodecyl sulfate
    SDS
    Opis:
    Ligand-modified micellar-enhanced ultrafi ltration (LM-MEUF) is a membrane technique based on a separation process which can be used for removal of target metals from an aqueous solution. This method involves adding both a metal complexing ligand and surfactant molecule to the aqueous solution under conditions where most of the molecules are present as micelles. This ligand can be attached to the surface of micelles by solubilization and forms the ligand complexes with the metal ion. The aqueous solution is then treated through a membrane which has to be smaller pore sizes than those of the complexes. Hence, permeate water is then purified from the heavy metals. In this study, divalent lead is the target ion in a solution. Filtration experiments were performed with ultrafi ltration membrane system, equipped with a regenerated cellulose membrane with a 5000 Daltons cutoff. The pressure was fixed at 4.0 bar with a permeate flow rate of 500 mL min–1 . Complexes of Pb2+  ions with three ligands were investigated in micellar medium of different surfactants at different pH values to determine the ligands which could provide separation. Different parameters affecting the percentage rejection of the Pb2+ , such as pH and surfactant concentration were also discussed. Results have shown that the maximum percentage of the Pb2+  ions rejection were obtained using sodium dodecyl sulfate (SDS) as a surfactant and dithizone (DZ) as the lead-specifi c ligand. A waste stream sample from a battery plant was subjected to LM-MEUF process in the optimum conditions determined in this study and it was shown that Pb2+  ions in a waste stream could be removed by LM-MEUF effectively.
    Źródło:
    Polish Journal of Chemical Technology; 2018, 20, 2; 80-84
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption kinetics of fluoride on bone char and its regeneration
    Autorzy:
    Hu, J.
    Wu, D.
    Rao, R.
    Liu, R.
    Lai, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/206892.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chlorine compounds
    fluorine compounds
    ions
    sodium compounds
    sulfur compounds
    adsorption kinetics
    chemical reaction equilibrium
    correlation coefficient
    Freundlich equation
    optimal conditions
    layered double hydroxides
    aqueous-solution
    drinking water
    equilibrium
    adsorbent
    związki chloru
    związki fluoru
    jod
    związki sodu
    związki siarki
    kinetyka adsorpcji
    równowaga reakcji chemicznej
    współczynnik korelacji
    równanie Freundlicha
    woda pitna
    równanie Langmuira
    Opis:
    The adsorbent of bone char (BC), produced from the pyrolysis of crushed animal bones, was dominated by the mesopores of the Brunauer Emmett Teller (BET) surface area. The optimal condition for defluoridation with BC was a pH level near 5.0. Chloride and nitrate ions could increase fluoride adsorption capacity in contrast with the effect of sulfate and carbonate ions. The interchangeability between fluoride and hydroxyl groups on BC sorbent was proved by the Fourier transform infrared spectroscopy. Langmuir equation had a better correlation coefficient than the Freundlich equation at various temperatures. Thermodynamic parameters such as Delta G degrees, Delta H degrees, Delta S degrees, Ea and S*, have been calculated to describe the nature of fluoride adsorption onto BC. Negative Delta G degrees and Delta H degrees values at various temperatures indicate a spontaneous process, and its exothermic effect, respectively. However, a positive Delta S degrees value represents an increasing process for entropy. The E-a and S* values ranging from 5 to 40 kj.mol-1 and 0 to 1, respectively, demonstrated that the adsorption is dominated by physical process, although the adsorption kinetic process was involved external diffusion, intraparticle diffusion and chemical reaction equilibrium stage. A high concentration of NaOH solution increases efficiency of removing adsorbed F- ions from the BC surface.
    Źródło:
    Environment Protection Engineering; 2017, 43, 3; 93-112
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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