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    Wyświetlanie 1-4 z 4
    Tytuł:
    Evaluation of the use of regenerated activated carbons for the adsorption of phenol from a river
    Autorzy:
    Marszałek, Anna
    Puszczało, Ewa
    Powiązania:
    https://bibliotekanauki.pl/articles/28411657.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    adsorbent regeneration
    organic contaminants
    inorganic contaminants
    phenol removal
    surface water
    Opis:
    The aim of the study was to use regenerated activated carbon to adsorb phenol from a river. Coconut shell activated carbon was derived from used tap water filter cartridges. The activated carbon was carbonised and then activated with KOH at 200°C, under a nitrogen atmosphere. The resulting adsorbent was characterised on the basis of nitrogen adsorption by Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM) analysis and point of zero charge (pH PZC). The study of periodic adsorption included kinetic and equilibrium modelling, determined the effect of solution pH on efficiency and the possibility of regeneration and reuse of the adsorbent. The efficiency of phenol removal from model water was evaluated, followed by the possibility of their adsorption from a polluted river in Silesia Province. Phenol adsorption followed pseudo-second-order kinetics. The adsorbents showed high adsorption abilities, as determined by the Langmuir isotherm model. The model fits the experimental data well. The concentration of phenol in the river was in the range of 0.45-0.77 mg∙dm-3, which means that its value was at least five times higher than the standard values. The use of regenerated activated carbon from waste filter cartridges removed phenol from the river by 78% using optimal test parameters.
    Źródło:
    Journal of Water and Land Development; 2023, 59; 93--99
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    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
    Tytuł:
    Utilization of Calcined Gypsum in Water and Wastewater Treatment: Removal of Phenol
    Autorzy:
    Igwegbe, Chinenye Adaobi
    Al-Rawajfeh, Aiman Eid
    Al-Itawi, H.I.
    Sharadqah, S.
    Al-Qazaqi, Shahd
    Abu Hashish, Esraa
    Al-Qatatsheh, Malak
    Sillanpaa, Mika
    Powiązania:
    https://bibliotekanauki.pl/articles/123203.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    calcined gypsum
    phenol
    removal
    thermodynamics parameters
    Opis:
    The release of phenol-containing effluents above the phenol permissible limit has triggered a lot of concern over the world due to their toxic nature. The adsorptive potential of gypsum on the removal of phenol was investigated. The effect of gypsum loading (0.5–3 g), contact time (2.5–20 min) and solution temperature (298 to 318 K) on the removal of phenol by gypsum was studied at neutral pH. The thermodynamics of the adsorption process was also studied. The kinetic data were fitted into the pseudo-second-order, Elovich, and intraparticle diffusion models. The removal efficiency of phenol increased along with the mass of gypsum, contact time and temperature. The results of the thermodynamics study indicate that the adsorption process is spontaneous and endothermic in nature. The change in free energy (ΔG0) was found to increase with temperature. The values of the estimated ΔG0 suggest that the phenol adsorption on gypsum is a physical adsorption process. Additionally, the kinetic data fitted best into the pseudo-second-order than the other kinetic models. This study proved that phenol can be used effectively for the reduction of phenol concentrations in water and wastewater.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 7; 1-10
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany chemii powierzchni węgla aktywnego WD-extra po regeneracji reagentem Fentona zastosowanego do adsorpcji zieleni naftolowej B
    Changes in the chemistry of WD-extra activated carbon surface after fentons reagent regeneration used for adsorption of naftol green B
    Autorzy:
    Bezak-Mazur, E.
    Adamczyk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818793.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    adsorpcja zieleni
    chemia powierzchni
    removal
    phenol
    ozone
    Opis:
    This paper describes the process of adsorption of selected acid dye such as naphthol green B on virgin and regenerated commercial activated carbon WD-extra (Gryfskand). Fenton's reagent regeneration was carried out five times. In the case of virgin activated carbon adsorption value was 130 mg/g, and for the regenerated it has ranged from 38 mg/g to 71 mg/g At the same time the weight loss was controlled, which after five regenerations equal almost 23%. Sorption capacity of activated carbon was controlled with an iodine adsorption numebr in accordance to the PN-83 C-97555.04. It was noted that with the times of regeneration iodine number decreased slightly. In experiment the concentration of acidic and basic functional groups on the surface of the activated carbon was measured by Boehm method. According to the results it can be concluded that regeneration by Fenton's reagent increases the content of acid groups and reduce the basic groups. Amount of acid groups increased to 4.625 mmol/g, and the basic groups has decreased to 0.9375 mmol/g.
    Źródło:
    Rocznik Ochrona Środowiska; 2013, Tom 15, cz. 1; 966-988
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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