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Spectroscopic study of Zn2+ and Co2+ binding to extracellular polymeric substances (EPS) from aerobic granules

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Abstract.
The interacting mechanisms of metallic cations (Zn2+ and Co2+) to active chemical groups on the extracellular
polymeric substances (EPS) of the aerobic granules, including loosely bound EPS (LB-EPS) and
tightly bound EPS (TB-EPS), were examined by X-ray photoelectron spectroscopy (XPS) and Fourier transform
infrared (FTIR) spectroscopy. For Zn2+ and Co2+, LB-EPS showed stronger binding properties than TBEPS
and the process of them was described well by the Langmuir isotherm. Compared to the single-metal
system, binary-metal addition induced competitive binding between the Zn2+ and Co2+ with reduction of
the maximal binding capacity for both EPS. The main chemical groups involved in the interactions
between contaminants were apparently alcohol, carboxyl and amino. These groups were part of the
EPS structural polymers, namely, polysaccharides, proteins, and hydrocarbon-like products. When biosorption
and flocculation occurred at the same time, the LB-EPS were used not only as chelate sorbents
but also as flocculants to further enhance their sorption capacity.

Keywords:
Extracellular polymeric substances (EPS)
Aerobic granules
Bind
XPS analysis
Metal ions

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Ketersediaan

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Informasi Detail

Judul Seri

Journal of Colloid and Interface Science

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Colloid and Interface Science 335 (2009) 11–17

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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