Zdolności adsorpcyjne modyfikowanych bentonitów wobec adsorbatów kationowych

• Autorzy: Ziółkowska D. , Szymańska D. , Waszak K. , Shyichuk A.

Warianty tytułu

EN

Adsorption abilities of modified bentonites towards cationic adsorbates

• Języki publikacji: PL

Abstrakty

PL

Przemysłowy bentonit sodowy poddano obróbce chemicznej za pomocą roztworów NaOH i H2SO4 oraz obróbce termicznej. Próbki bentonitu surowego oraz modyfikowanego badano pod kątem ich przydatności jako ekonomicznych adsorbentów stosowanych do usuwania barwników kationowych oraz jonów metali z roztworów wodnych. Wielkości powierzchni właściwych adsorbentów oszacowano na podstawie adsorpcji błękitu metylenowego. Stwierdzono, że tak określone powierzchnie właściwe bentonitów nie korelują z powierzchniami wyznaczonymi metodą BET. Izotermy adsorpcji błękitu metylenowego i jonów Ni(II) dla bentonitu surowego oraz próbek modyfikowanych wyznaczono metodą statyczną w temperaturze pokojowej. Surowy bentonit jest skutecznym adsorbentem dla błękitu metylenowego, osiągając pojemność adsorpcyjną 122 mg/g. Bentonit może być także stosowany do usuwania jonów Ni(II) z roztworów wodnych, gromadząc 21 mg Ni²+/g. Jego pojemność adsorpcyjna względem jonów Ni(II) zwiększa się o 14% na skutek przemywania roztworem NaOH.

EN

Industrial Na-bentonite was examined as an economic adsorbent employed for elimination of cationic dyes and metal ions from aqueous solutions. Four adsorbent samples were prepared: a non-modified bentonite, that washed with 1M H2SO4 solution, that washed with 1M NaOH solution as well as that heated at 750°C. The adsorption isotherms of methylene blue as well as Ni(II) ions were determined for all the bentonite samples. The batch experiment was carried out at the room temperature. Adsorbate concentrations were determined with the spectrophotometric method (λ = 666 nm) for methylene blue and AAS for Ni(II) ions. Experimental adsorption isotherms were described with the Langmuir and Freundlich equations. Bentonite was found as the effective adsorbent for both the dye and the Ni(II) ions comparing to other clay minerals - its adsorption capacity reaches values 122 and 21 mg/g, respectively. The methylene blue dye appeared to have a quite high affinity to bentonite (the isotherms are of the Langmuire shape) whereas Ni(II) ions have less affinity to bentonite (almost all the isotherms are of the Freundlich shape). Adsorption capacity of bentonite towards Ni(II) ions was improved by 14% as a result of washing with NaOH solution or by 20% as a result of calcination. It is worth to notice that basic modification of adsorbent is efficient at low concentrations of nickel in the solution. It was also observed that specific surface areas of bentonite samples depicted with BET method do not agree with those obtained with the aid of methylene blue adsorption.

Słowa kluczowe

PL

adsorpcja; bentonit; błękit metylenowy; jony Ni(II)

EN

adsorption; bentonite; methylene blue; Ni(II) ions; calcination

• Wydawca: Wydawnictwo Politechniki Częstochowskiej
• Czasopismo: Inżynieria i Ochrona Środowiska
• Rocznik: 2006
• Tom: T. 9, nr 4
• Strony: 457--466
• Opis fizyczny: Bibliogr. 19 poz.

Twórcy

autor

Ziółkowska D.

autor

Szymańska D.

autor

Waszak K.

autor

Shyichuk A.

• Uniwersytet Technologiczno-Przyrodniczy, Wydział Technologii i Inżynierii Chemicznej, Zakład Chemii Ogólnej, ul. Seminaryjna 3, 85-326 Bydgoszcz

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