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    Wyświetlanie 1-11 z 11
    Tytuł:
    Removal of uranium(VI) from aqueous solution by rice husk
    Autorzy:
    Xia, L.
    Li, R.
    Xiao, Y.
    Zheng, W.
    Tan, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/208201.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    wheat straw
    biosorption
    uranium
    ions
    biosorpcja
    słoma zbożowa
    uran
    jony
    Opis:
    Basic aspects of uranium adsorption by rice husk have been investigated. The influences of various experimental parameters such as pH, time, adsorbent dosage, rice husk size, temperature and various concentrations of uranium on uptake were evaluated. The thermodynamics and kinetics of adsorption were analyzed by FT-IR and SEM. The adsorption capacity for uranium on rice husk increased upon increasing initial concentration of uranium and temperature, while decreased with the increase of the amount of rice husk. Maximum uranium adsorption was observed at pH = 3 and particle size between 120 μm and 150 μm. Adsorption equilibrium was achieved within 60 min. At 25 °C, the saturated adsorption capacity qmax was up to 15.14 mg/g when the initial concentration of uranium ranged from 10 to 400 mg/dm3. The adsorption of uranium followed Langmuir adsorption isotherm and according to quasi-second order kinetic equation. The calculated values of ΔH°, ΔS°, and ΔG° indicated that the biosorption process was endothermic and spontaneous. Based on FT-IR spectra it may be concluded that hydroxyl, carbonyl, P–O and Si=O groups are the main active sites.
    Źródło:
    Environment Protection Engineering; 2017, 43, 4; 41-53
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of fluoride ions by ultrafiltration in the presence of cationic surfactants
    Autorzy:
    Klimonda, A.
    Grzegorzek, M.
    Majewska-Nowak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/208133.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ultrafiltration
    fluoride ions
    surfactant
    membrane
    ultrafiltracja
    jony fluorkowe
    fluor
    surfaktanty
    membrany
    Opis:
    The usability of surfactant-aided ultrafiltration for removal of fluoride ions from aqueous solutions has been investigated. The experiments were conducted with the use of cellulose and polyethersulfone membranes. Fluoride solutions containing 10 and 100 mg F–/dm3 and cationic surfactants: octadecylamine acetate (ODA) and hexadecylpyridium chloride (CPC) were used in the experiments. The concentration of surfactants amounted to 320–960 mg/dm3. Ultrafiltration process was run under a trans-membrane pressure of 0.2 MPa. In the course of experiments, the effects of initial fluoride concentration, surfactant concentration and membrane type on the fluoride retention coefficient as well as the permeate flux were studied. It was found that the increase of the surfactant concentration effected in improvement of the separation efficiency. On contrary, the permeate flux decreased upon increase of the surfactant concentration. The process efficiency was also strongly influenced by the membrane and surfactant type. The permissible concentration of fluoride in the final product (below 1.5 mg F–/dm3) was obtained for the test with initial solutions containing 10 mg F–/dm3, polyethersulfone membrane and CPC con-centration equal to 644 and 966 mg/dm3.
    Źródło:
    Environment Protection Engineering; 2017, 43, 2; 5-13
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of zinc, cadmium and nickel from mining waste leachate using walnut shells
    Autorzy:
    Ayala, Julia
    Fernandez, Begona
    Powiązania:
    https://bibliotekanauki.pl/articles/208277.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    metal ions
    adsorption
    biosorption
    adsorbent
    kinetics
    copper
    jony metali
    adsorpcja
    biosorpcja
    kinetyka
    miedź
    Opis:
    The removal of heavy metals from aqueous solutions using walnut shells was investigated. The effects of pH, contact time, initial metal concentration, adsorbent concentration, and co-ions were studied in synthetic solutions. Metal uptake was found to be dependent on the initial pH of the solution; the removal rate increased upon increasing pH, showing the highest affinity at pH 5–7. The amount of metal removed improved with increasing initial concentration. Increasing adsorbent dosage enhanced removal efficiency, but reduced the amount absorbed per unit mass of walnut shells. The presence of co-ions suppressed the uptake of heavy metals, divalent ions having a more negative effect than monovalentions. The adsorption of Zn, Cd and Ni onto walnut shells was found to fit Langmuir and Freundlich isotherms. The results obtained in the tests with mining waste leachate showed the potential use of walnut shells for the removal of heavy metals.
    Źródło:
    Environment Protection Engineering; 2019, 45, 2; 141-158
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bioaccumulation capacities of copper(II) ions in Salvinia natans
    Autorzy:
    Hołtra, A.
    Zamorska-Wojdyła, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/207713.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bioaccumulation
    copper ions
    Salvinia natans
    water contamination
    biokumulacja
    zanieczyszczenie wody
    jony miedzi
    paproć wodna
    salwinia pływająca
    Opis:
    Capacities of the pleustophytes in the purification of the aquatic environments in Polish climatic zone have been evaluated. Studies of bioaccumulation of copper(II) from culture media contaminated with 5, 10, 15 and 20 mg Cu/dm3 by the plants of Salvinia natans species were performed. The process was carried out for 14 days with the use of artificial plant-breeding species. The balance of the content of copper(II) in dry matter of plants and in the culture media was investigated. Capabilities of Salvinia natans to bioaccumulate copper(II) have been confirmed in all contaminated culture media.
    Źródło:
    Environment Protection Engineering; 2014, 40, 4; 41-51
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of modified maize hull for removal of Cu(II) ions from aqueous solutions
    Autorzy:
    Ghasemi, S. M.
    Mohseni-Bandpei, A.
    Ghaderpoori, M.
    Fakhri, Y.
    Keramati, H.
    Taghavi, M.
    Moradi, B.
    Karimyan, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/208248.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    heavy metal ions
    waste water
    Cu(II)
    ions
    adsorption
    biomass
    jony metali ciężkich
    ścieki
    biomasa
    adsorpcja
    Opis:
    Discharge of industrial waste containing heavy metals to the environment is a main concern because of their toxicity to many life forms. Adsorption process is one of the conventional methods in order to adsorb heavy metals from wastewater effluents. Therefore, the removal of Cu(II) from aquatic solutions using modified maize hull was investigated. All experiments were performed in batch conditions. The residual Cu(II) concentration was measured by AAS. Upon increasing the adsorbent dosage, pH, and contact time and decreasing Cu(II) concentration, the removal efficiency of Cu(II) ions increased. In optimum conditions, 50% of copper was removed by modified maize hull. The experimental data were best fitted by the Langmuir type 2 model and the adsorption kinetic model followed a pseudo-second order type 1 model. It seems that the use of the modified maize hull to remove Cu(II) ions is very suitable, low-cost, and efficient.
    Źródło:
    Environment Protection Engineering; 2017, 43, 4; 93-103
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mitigation of scale problem in the pumped Disi water to Amman, Jordan
    Autorzy:
    Al-Maabreh, Alaa M.
    Al-Rawajfeh, Aiman Eid
    Alshamaileh, Ehab
    Al-Bazedi, G. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/206973.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    scale deposition
    water parameters
    plumbing system
    multivalent ions
    osadzanie się kamienia
    parametry wody
    systemy hydrauliczne
    jony wielowartościowe
    Opis:
    Various methods are known to mitigate or prevent scale formation in pipes, rather by chemical addition, e.g., anti-scaling substances, or physically which includes ultrasonic or nanofiltration (NF). Nanofiltration membranes have a selectivity for the multivalent charged ions, so monovalent ions will pass the membrane partly and multivalent ions will be rejected completely. Chemical addition to prevent scale formation is based on justifying water parameters such as pH, alkalinity, and concentrations of ions that form the building units of scale crystal. In order to mitigate the scaling tendency in water pumped from the Disi aquifer to Amman city along its 345 km pipeline, different studies were conducted using simulated plumbing system. This part of the study is concerned with scale mitigation using nanofiltration and addition of chemicals. Nanofiltration was applied to reduce the hardness that causes scale deposition where it rejected around 70.5% of Ca2+, 71.98% Mg2+, 7.72% K+, 29.0% Na+, 66.63% Cl–, 86.51% NO3 – , 85.72% SO4 2–, and 69.85% CO2. Increasing the concentration of some ions such as Na+, K+ and Cl– keeping the allowable limit gave good results for scale mitigation.
    Źródło:
    Environment Protection Engineering; 2019, 45, 1; 97-110
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ag+/S2O8 2– system for the degradation of aqueous flutriafol
    Autorzy:
    Yang, H.
    Zhou, W.
    Yang, L.
    Deng, J.
    Hu, Q.
    Wei, H.
    Au, C.
    Yi, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/207760.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chemical analysis
    degradation
    free radicals
    metal ions
    molecular orbital
    transition metals
    analiza chemiczna
    degradacja
    wolne rodniki
    jony metali
    orbital molekularny
    metale przejściowe
    Opis:
    The degradation of flutriafol in aqueous persulfate (S2O82–) system in the presence of selected transition metal ions was investigated. In the presence of Ag+ or Fe2+, flutriafol degradation occurs, whereas in the presence of Mn2+, Co2+, Ni2+, Cu2+, Zn2+ and Bi3+ ions, the degradation is less than 15%. The Ag+/ S2O82– aqueous system being the most effective was adopted for experimental and theoretical investigations. It was confirmed that pH of 3.0 is the most suitable, and that both · SO4–and ·OH– radicals are the main active species to afford flutriafol degradation, with the former contributes more than the latter. To elucidate degradation mechanism, molecular orbital calculations were performed and reaction intermediates identified by GC/MS and HPLC/MS/MS analyses. Three degradation pathways are proposed that involve the cleavage of C–N and C–C bonds as a result of ·SO4– attack, as well as the formation of hydroxylated products due to · OH radicals.
    Źródło:
    Environment Protection Engineering; 2018, 44, 2; 57-72
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient nitrate adsorption from water by aluminum powder. Kinetic, equilibrium and influence of anion competition studies
    Autorzy:
    Fakhri, Y.
    Kakavandi, B.
    Safaei, Z.
    Asadi, A.
    Mohseni, S. M.
    Golestanifar, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/208008.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    aluminium compounds
    kinetic parameters
    kinetic theory
    negative ions
    nitrates
    nitrogen removal
    particle size
    związki glinu
    parametry kinetyczne
    teoria kinetyczna
    jony ujemne
    azotany
    usuwanie azotu
    rozmiar cząstek
    Opis:
    The feasibility of aluminum powder (with particle size of 75–150 μm) for nitrate removal from aqueous solutions has been investigated. Adsorption was examined in function of initial nitrate concentration, contact time, pH and influence of other interfering anions. Maximum nitrate removal occurred at equilibrium pH of 10. The kinetics of adsorption of nitrate ions was discussed based on three kinetic models, namely: the pseudo-first order, the pseudo-second order and the intraparticle diffusion model. The experimental data fitted the pseudo-second order kinetic model very well; the rate constant was 4x10–4 g/ (mg·min) at the concentration of NO3- of 100 mg/dm3. The adsorption data followed both Langmuir (R2 = 0.808) and Freundlich (R2 = 0.865) isotherms probably due to the real heterogeneous nature of the surface sites involved in the nitrate uptake. The maximum sorption capacity of aluminum powder for nitrate adsorption was found to be ca. 45.2 mg/g at room temperature. The results indicate that aluminum powder is an interesting alternative for nitrate removal from the water.
    Źródło:
    Environment Protection Engineering; 2018, 44, 3; 19-31
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surfactant assisted removal of Cu(II), Cd(II) and Pb(II) from contaminated soils
    Autorzy:
    Ramamurthy, A.
    Schalchian, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/207738.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    metal ions
    soil pollution
    surface active agents
    contaminated soils
    metal removal
    residual contaminants
    contaminants removal
    surfactants
    jony metali
    zanieczyszczenie gleby
    środki powierzchniowo-czynne
    gleba zanieczyszczona
    usuwanie metali
    zanieczyszczenia resztkowe
    usuwanie zanieczyszczeń
    Opis:
    The study deals with the removal of residual contaminants Cu(II), Cd(II) and Pb(II) from soil using surfactants sodium dodecyl sulfate (SDS), sodium dioctyl sulfosuccinate, and Triton x-100. Surfactants were used with and without chelating agent ethylenediaminetetraacetic acid (EDTA). SDS (10 mM) was the most effective surfactant for removing metals. Replacing distilled water with SDS enhanced metal removal by the factor of 5.5, 28.8, and 29.1 for Cu(II), Cd(II), and Pb(II), respectively. SDS with EDTA was efficient in removing metals. Interaction of metal ions with respect to adsorption and desorption were also studied.
    Źródło:
    Environment Protection Engineering; 2013, 39, 3; 87-99
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the physiological condition of Salvinia natans L. exposed to copper (II) ions
    Autorzy:
    Hołtra, A.
    Zamorska-Wojdyła, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/207308.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Salvinia natans
    bioremediation
    copper
    metal ions
    metals
    aquatic environments
    culture medium
    physiological condition
    physiological parameters
    phytoremediation
    salwinia pływająca
    bioremediacja
    miedź
    jony metali
    fizjologia
    środowisko wodne
    pożywka hodowlana
    stan fizjologiczny
    parametry fizjologiczne
    fitoremediacja
    Opis:
    Salvinia natans L. is a known bioaccumulator of metal ions from the aquatic environment. Exposure of plants to prolonged impact of toxins along with a large dose of the metal affects the physiological condition of the plants. The changes occurring in the plants in the phytoremediation process in contaminated medium culture of 5, 10, 15 and 20 mg Cu/dm3 show two basic physiological parameters: the assimilation pigment content (chlorophyll a and b) responsible for the production of energy in the process of photosynthesis, and the total protein level as the main constituent of the plant. Conducted studies confirmed a negative effect of high concentrations of copper(II) on Salvinia natans L. plants which in these conditions are capable to bioaccumulate metal from each contaminated culture medium.
    Źródło:
    Environment Protection Engineering; 2015, 41, 3; 147-158
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Equilibrium and kinetic studies on the removal of heavy metal ions with natural low-cost adsorbents
    Autorzy:
    Varank, G.
    Demir, A.
    Bilgili, M. S.
    Top, S.
    Sekman, E.
    Yazici, S.
    Erkan, H. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/207257.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    adsorbents
    adsorption
    bentonite
    dyes
    heavy metals
    kinetics
    metal ions
    water treatment
    heavy metal removal
    heavy metal ions
    heavy metals ions removal
    adsorbenty
    adsorpcja
    bentonit
    barwniki
    metale ciężkie
    kinetyka
    jony metali
    usuwanie jonów metali ciężkich
    uzdatnianie wody
    Opis:
    Adsorption isotherms and kinetics of the removal of heavy metal ions (Ni, Pb, Zn) from aqueous solutions by natural adsorbents (zeolite, bentonite, clay) were investigated in a lab-scale batch study. The effect of various parameters such as adsorbent dosage, initial concentration of heavy metal ions, temperature, and agitation time were studied to optimise the conditions. Under those optimized conditions (180 rpm agitation rate, 120 min agitation time, pH 4.0, 298 K, 100 mg/dm3 initial adsorbate concentration), the removal percentages of heavy metal ions for natural adsorbents have been determined. The adsorption mechanisms and characteristic parameters of the process were analyzed by two and three parameter isotherm models (Langmuir, Freundlich, Temkin, Redlich-Peterson, Toth and Sips), and kinetic models (Lagergren's pseudo-first order, Ho and McKay's pseudo-second order). Adsorption thermodynamics of heavy metal ions (changes of standard enthalpy, entropy and free energy) on zeolite, bentonite and clay were also studied at 298,318 and 338 K.
    Źródło:
    Environment Protection Engineering; 2014, 40, 3; 43-61
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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