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    Wyświetlanie 1-4 z 4
    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
    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:
    Rola metali w rozwoju choroby Alzheimera i Parkinsona
    The role of metals in development Alzheimer's and Parkinson's diseases
    Autorzy:
    Żygowska, Justyna
    Szymańska, Aneta
    Powiązania:
    https://bibliotekanauki.pl/articles/2057913.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    choroba neurodegeneracyjna
    jony metali
    β-amyloid
    białka amyloidogenne
    choroba Alzheimera
    choroba Parkinsona
    neurodegenerative diseases
    amyloidogenic proteins
    amyloid β
    metal ions
    Alzheimer's disease
    Parkinson disease
    Opis:
    Neurodegenerative diseases are the consequence of progressive brain degeneration caused by the death of nerve cells. Many factors that influence the neurodegeneration development are still not fully known. A lot of studies indicate the contribution of metal ions in this process. Copper, zinc, and iron are trace elements essential for proper functioning of the body. They are part of many enzymes participating in the transmission of the nerve signals, electrons transport, neurotransmitters and nucleic acids synthesis, and oxygen storage. Disorder of metals homeostasis leads to the development of severe diseases and nervous system degenerations. An excess of copper and iron ions causes a significant increase in cellular oxidative stress. Metals catalyze the reactions of free radicals formation that destroy proteins, lipids, and nucleic acids. High concentration of copper and iron ions were found in the deposits of amyloidogenic proteins. Amyloid β (Alzheimer disease) and α synuclein (Parkinson disease) have ions binding chain structures. The metal-protein interaction increases oligomerization speed in vitro. A lot of evidence suggests that the disorder of Cu, Zn and Fe homeostasis accelerates the progress of brain neurodegeneration. Human organism contains many metals, which are not needed for the proper functioning of the body, e.g. aluminum. Al binds to nucleic acids causing an increase in cellular oxidative stress and initiating proteins oligomerization. The presence of aluminum is also considered to be disadvantageous for the nervous system. The lack of medicines for neurodegenerative diseases forces us to search for new therapies. The development of degenerations could be slowed down by chelators of toxic metals, but first, these diseases must be better understood. Adverse effects of high concentration of metal ions on brain functioning are not fully known. This knowledge is necessary to find effective drugs.
    Źródło:
    Wiadomości Chemiczne; 2022, 76, 1-2; 1-25
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    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
      Wyświetlanie 1-4 z 4

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