Biosorption of Cr(III) from aqueous solution by activated sludge

• Autorzy: Wierzba S. , Korbecki T.

Identyfikatory

DOI

10.2428/ecea.2016.23(3)28

Warianty tytułu

PL

Biosorpcja Cr(III) z roztworów wodnych przez osad czynny

• Języki publikacji: EN

Abstrakty

EN

The biosorption of Cr(III) from aqueous solution using activated sludge (AS) microorganisms was investigated under various experimental conditions regarding pH and temperature. Biosorption equilibrium parameters were determined based on the Langmuir and Freundlich isotherm model. The kinetic parameters were established using the equations of pseudo-first order and pseudo-second order. Moreover thermodynamic parameters have been calculated. Langmuir isotherm provided a better fit to the equilibrium data. The maximum experimentally determined sorption capacity 26.95 mg · g^–1 obtained at 25^oC and pH 5.0. The kinetics model of pseudo-second order row has been better describing experimental data. The negative value of free Gibbs energy (ΔG⁰) proves spontaneous Cr(III) biosorption by AS biomass and its decreasing along with temperature increase. The negative value of enthalpy (ΔH⁰) and entropy (ΔS⁰) indicates exothermic process and limitation of degree of freedom Cr(III) ions on the interphase surface solution/biosorbent. FT-IR spectroscopy analysis indicated the contribution of carboxylate groups towards the biosorption of Cr(III) by AS.

PL

W pracy badano proces biosorpcji jonów chromu(III) z roztworów wodnych przez mikroorganizmy osadu czynnego (OC), w różnych warunkach pH i temperatury. Parametry równowagowe biosorpcji wyznaczono w oparciu o modele izoterm Langmuira i Freundlicha. Parametry kinetyczne określono za pomocą równań pseudopierwszego i pseudodrugiego rzędu. Obliczono również parametry termodynamiczne procesu. Izoterma Langmuira lepiej opisywała dane równowagowe. Maksymalna pojemność sorpcyjna wyznaczona eksperymentalnie wynosiła 26,95 mg · g^–1 przy 25^oC i pH 5,0. Model kinetyki pseudodrugiego rzędu lepiej opisywał dane doświadczalne. Ujemna wartość energii swobodnej Gibbsa (ΔG⁰) świadczyła o spontaniczności biosorpcji Cr(III) przez biomasę OC i jej spadku wraz ze wzrostem temperatury. Ujemna wartość entalpii (ΔH⁰) i entropii (ΔS⁰) wskazywała na egzotermiczność procesu i ograniczenie stopni swobody jonów Cr(III) na powierzchni międzyfazowej roztwór/biosorbent. Analiza FT-IR wykazała udział grup karboksylanowych w biosorpcji Cr(III) przez OC.

Słowa kluczowe

EN

activated sludge; biosorption; chromium(III)

PL

osad czynny; biosorpcja; chrom(III)

• Wydawca: Towarzystwo Chemii i Inżynierii Ekologicznej
• Czasopismo: Ecological Chemistry and Engineering. A
• Rocznik: 2016
• Tom: Vol. 23, nr 3
• Strony: 337--346
• Opis fizyczny: Bibliogr. 25 poz., wykr., tab.

Twórcy

autor

Wierzba S.

• Independent Department of Biotechnology and Molecular Biology, University of Opole, ul. kard. B. Kominka 6a, 40–035 Opole, Poland, phone: [phone]

autor

Korbecki T.

• Independent Department of Biotechnology and Molecular Biology, University of Opole, ul. kard. B. Kominka 6a, 40–035 Opole, Poland, phone: [phone]

Bibliografia

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Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).