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Sorptive removal of tetracycline from water by palygorskite

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Abstract.
Extensive use of pharmaceuticals and growth hormone in farm animal and live stocks has resulted in their
frequent detection in soils, groundwater, and wastewater. The fate and transport of these compounds are
strongly affected by their sorptive behavior to the soil minerals and humic materials. In this research, we
conducted the sorption of tetracycline (TC), a common antibiotic, on palygorskite (PFL-1), a fibrous clay
mineral of high surface area and high sorptivity towards organic compounds. The results showed that
the sorption capacity of TC on PFL-1 was as high as 210 mmol/kg at pH 8.7. The sorption was relatively
fast and reached equilibrium in 2 h. Solution pH and ionic strength had significant effects on TC sorption.
The sorption of TC by palygorskite is endothermic and the free energy of sorption is in the range of −10
to −30 kJ/mol, suggesting a strong physical sorption. The X-ray diffraction patterns before and after TC
sorption revealed no changes in d-spacing and intensity under different pH and initial TC concentrations,
indicating that the sorbed TC molecules are on the external surface of the mineral in contrast to intercalation of TC into swelling clays, such as montmorillonite. The small positive value of entropy change
suggested that TC molecules are in disordered arrangement on palygorskite surfaces. Surface sorption of
TC on PFL-1 is further supported by the derivative of gravimetric analysis and by the calculation of the
amount of TC sorption normalized to the surface area. The results suggest that palygorskite could be a
good candidate to remove TC from wastewater containing higher amounts of TC.

Keywords:
Clay
Palygorskite
Pharmaceutical
Sorption
Tetracycline

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Informasi Detail

Judul Seri

Journal of Hazardous Materials

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Journal of Hazardous Materials 165 (2009) 148–155

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

LINGKUNGAN HIDUP

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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