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    Wyświetlanie 1-7 z 7
    Tytuł:
    Removal of reactive dye from aqueous solutions using banana peel and sugarcane bagasse as biosorbents
    Autorzy:
    Ahmed, Arif Eftekhar
    Majewska-Nowak, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2032951.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    reactive dye
    biosorption
    Eurozol Navy Blue
    ENB
    banana peel
    barwnik reaktywny
    biosorpcja
    skórka banana
    Opis:
    The adsorption of Eurozol Navy Blue (ENB) reactive dye was examined using banana peel and sugarcane bagasse powders. Several parameters such as pH, contact time, agitation speed, temperature, initial dye concentration, and adsorbent dosage were considered and their impact on dye adsorption efficiency was evaluated. The removal percentages of ENB dye due to adsorption on banana peel and sugarcane bagasse were 72% and 70%, respectively. Simultaneous dosing of both biosorbents resulted in 68% dye removal. The Langmuir isotherm model was found to fit the adsorption of ENB dye on banana peel and sugarcane bagasse powders. The corresponding maximum adsorption capacities were equal to 24.09, 32.46, and 27.54 mg/g for banana peel powder, sugarcane bagasse powder, and the mixture of adsorbents, respectively.
    Źródło:
    Environment Protection Engineering; 2020, 46, 3; 121-135
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of acid, direct and reactive dyes on thepolyacrylic anion exchanger
    Autorzy:
    Polska-Adach, Ewelina
    Wawrzkiewicz, Monika
    Hubicki, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/110859.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    dye removal
    polyacrylic anion exchanger
    reactive dye
    direct dye
    acidic dye
    Opis:
    In the present studythe polyacrylic anion exchanger Amberlite IRA 478 (IRA 478) was used forremoval of textile dyes such as C.I. Acid Red 18 (AR18), C.I. Reactive Blue 21 (RB21) and C.I. Direct Yellow 142 (DY142) from aqueous solutions. Sorption of the above-mentioned dyes was carried out by the static and dynamic methods. The obtained results were analyzed by determining the adsorption isothermparameters using the Langmuir and Freundlichmodels. Kinetic parameters of dyessorption were calculated from the pseudo-first order, pseudo-second order and intraparticle diffusion models. The monolayer sorption capacities of IRA 478 determined from the Langmuir isotherm were found to be 1098.5 mg/g for AR18 (R2=0.994), 46.8 mg/g for DY142 (R2=0.820) and 23.5 mg/g for RB21 (R2=0.987).Kinetic studies revealed that effectiveness of AR18, DY142 and RB21 uptakeincreases with increasing phase contact time and initial dyesconcentration.The kinetics of the dyessorption process on the anion exchanger is best described by the pseudo-second order model (PSO) due to the high values of the determination coefficients R2 (linearity condition of the plot t/qt vs.t). The rate constantsof the pseudo-second order kinetics k2are reduced from 0.1001 to 0.0008 g/mg·min for AR18, from 0.0147 to 0.0112 g/mg·min for DY142 and 0.0489 to 0.0072 g/mg·min for RB21 with an increase of initial concentration of dyes.The presence of salts and surfactants had an impact on the retention of direct and reactive dyes.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1496-1508
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of reactive dyes from aqueous solutions using ultrafiltration membranes
    Autorzy:
    Ahmed, Arif Eftekhar
    Majewska-Nowak, Katarzyna
    Grzegorzek, Martyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2032851.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    reactive dye
    ultrafiltration membrane
    water solution
    dye removal
    barwnik reaktywny
    membrana ultrafiltracyjna
    roztwór wodny
    usuwanie barwnika
    Opis:
    The removal of five reactive dyes varying in molecular weight (Reactive Orange 16, Remazol Brilliant Blue R, Reactive Orange 20, Reactive Black 5, Reactive Red 120) was evaluated by using flat ultrafiltration membranes made of polyethersulfone (PES) and regenerated cellulose (C) characterized by various cut-off values (5, 10, and 30 kDa). The ultrafiltration process was performed in a dead-end mode under the transmembrane pressure range of 0.05–0.2 MPa. Dye concentration in model solutions was equal to 100 mg/dm3. The separation efficiency of all tested dyes was strongly dependent on the membrane type and the membrane cut-off, as well as on the applied pressure. Unexpectedly, the molecular weight of the tested reactive dyes had a minor impact on the dye removal effectiveness. The ultrafiltration membranes made of polyethersulfone and regenerated cellulose can be used in reactive dye removal on the condition that the membrane cut-off is not higher than 10 kDa. The PES and C membranes enable the separation of reactive dyes by 80–97%, and 45–89%, respectively.
    Źródło:
    Environment Protection Engineering; 2021, 47, 3; 109-120
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption of reactive dyes and their mixtures on activated carbon. Kinetics, equilibrium and thermodynamic evaluation
    Autorzy:
    Kouhail, Meriem
    Elahmadi, Zakia
    Benayada, Abbes
    Dewil, Raf
    Powiązania:
    https://bibliotekanauki.pl/articles/206912.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    adsorption efficiency
    adsorption kinetics
    Langmuir isotherm
    reactive dye
    COD
    efektywność adsorpcji
    kinetyka adsorpcji
    izoterma Langmuira
    barwnik reaktywny
    ChZT
    Opis:
    The adsorption of three reactive dyes (Reactive Bezactiv Yellow (RBY), Reactive Bezactiv Blue (RBB) and Reactive Bezactiv (RBR)) on a commercially available activated carbon (CAC) has been evaluated. It was shown that CAC is capable to effectively remove these dyes from a solution. The adsorption increased with higher contact time, adsorbent dose, and initial dye concentration. The data indicated that the adsorption kinetics of dyes on CAC followed a pseudo-second order model. The adsorption isotherms followed the Langmuir isotherm model. Evaluation of thermodynamic parameters revealed that the adsorption process is endothermic for all dyes and spontaneous in a single system and became spontaneous in mixture systems at high temperature, expect RBY and RBB in the ternary mixture. Adsorption was higher for RBY, followed by RBB, and was lowest for RBR. The total adsorption efficiency was confirmed by chemical oxygen demand (COD) measurements.
    Źródło:
    Environment Protection Engineering; 2020, 46, 2; 5-24
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficiency of response surface methodology for optimizing Reactive Blue 21 dye removal with modified bentonite
    Autorzy:
    Gharbani, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/207178.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bentonite
    efficiency
    solutions
    surface properties
    textile industry
    bentonit
    efektywność
    właściwości powierzchni
    wyroby włókiennicze
    Opis:
    Bentonite was modified with cetyltrimethylammonium bromide by a simple method and was used as an adsorbent for the removal of Reactive Blue 21 dye. Reactive Blue 21 is an important dye used in the textile industry, which is very harmful for living creatures, especially humans. The response surface methodology (RSM) was used to study the effect of independent variables such as dye concentration (20, 40, 60, 80 and 100 mg/dm3), time (10, 20, 30, 40 and 50 min), initial pH (2, 4, 6, 8, 10) and modified bentonite dosage (1, 2, 3, 4 and 5 g/dm3) on Reactive Blue 21 dye removal efficiency from aqueous solutions. At the optimum conditions (modified bentonite dosage 5 g/dm3, dye concentration 61.3 mg/dm3, pH 4.78; time14.31 min), the predicted removal of Reactive Blue 21 on modified bentonite was 93.22%. In a confirmatory experiment, 92.01% dye removal has been obtained. Thus, the experimental investigation and statistical approach enabled us to model adsorption of Reactive Blue 21 on modified bentonite.
    Źródło:
    Environment Protection Engineering; 2018, 44, 2; 73-85
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of reactive blue 29 dye by adsorption on modified chitosan in the presence of hydrogen peroxide
    Autorzy:
    Naghizadeh, A.
    Nabizadeh, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/208197.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    adsorption isotherms
    copper compounds
    isotherms
    sewage
    adsorption capacities
    Langmuir isotherm
    natural water systems
    izotermy adsorpcji
    związki miedzi
    ścieki
    izotermy kanalizacyjne
    ścieki przemysłowe
    izoterma Langmuira
    Opis:
    Industrial effluents that carry dyestuff into natural water systems are serious environmental concern. Complex aromatic structures of dyes make them more stable and more difficult to remove from the effluents discharged into water bodies. In the present study, removal of reactive blue 29 dye with chitosan and modified chitosan with Cu complexes from aqueous solution was investigated in a batch adsorption system with respect to the changes in the contact time, pH of solution and chitosan dosage. Adsorption isotherms of the dye onto chitosan were also studied. The results revealed that the adsorption capacity of chitosan with Cu complexes is lower than that of chitosan without Cu complexes. Also effect of H2O2 on adsorption when we used chitosan without Cu complexes is more considerable. The results also demonstrated that adsorption capacity of reactive blue 29 dye on chitosan was higher at lower pHs. Finally, the Langmuir isotherm showed the best conformity to the equilibrium data.
    Źródło:
    Environment Protection Engineering; 2016, 42, 1; 149-168
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption of reactive Orange 4 on sesame stalks. Modeling, kinetics and equilibrium
    Autorzy:
    Tanyildizi, M. S.
    Demirci, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/207499.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    aqueous solutions
    basic dye
    removal
    optimization
    degradation
    biomass
    design
    barwnik reaktywny
    hydroliza
    łodyga sezamu
    biomasa
    degradacja
    optymalizacja
    Opis:
    Placket Burman design (PBD) and central composite design (CCD) were employed to study the adsorption of Reactive Orange 4 (RO4) on sesame stalk. In the study conducted with the PBD, a total of seven parameters (initial dye concentration, initial pH of solution, temperature, amount of adsorbent, particle size, contact time, and shaking speed) were studied, and four of these were found to influence the adsorption of dye. A mathematical model equation was developed by using the CCD. Analysis of variance (ANOVA) indicated a high coefficient of determination (R2= 0.93). The initial dye concentration, amount of sesame stalk, contact time, and initial pH were shown to be very significant (p < 0.05) for RO4 adsorption. The data for the adsorption of RO4 at equilibrium on sesame stalk were analyzed by the Langmuir, Freundlich, and Tempkin models. Temperature increase from 20 to 60 degrees C enhanced the adsorption capacity of the monolayer from 84.75 to 178.57 mg/g. The rate constants were calculated for various initial concentrations of the dye by using pseudo-first and pseudo-second order kinetic and particle diffusion adsorption models. The kinetic evaluations showed that the experimental data were in accordance with the pseudo-second order model.
    Źródło:
    Environment Protection Engineering; 2017, 43, 3; 5-20
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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