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Kinetic parameters and mechanisms of the batch biosorption of Cr(VI) and Cr(III) onto Leersia hexandra Swartz biomass

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Abstract.
The hyperaccumulative plant species Leersia hexandra Swartz, particularly, has been considered for its
detoxification mechanism for phytoremediation of chromium-contaminated water environments. This
study investigates the role of the adsorption mechanism of the L. hexandra Sw. biomass on the removal of
chromium ions Cr(VI) and Cr(III) from an aqueous solution. The interaction between chromium ions and
the L. hexandra Sw. biomass was characterized by using infrared spectroscopy. The results indicate that the
binding process of the chromium ions involves the active participation of ligands present in the biomass,
such as acylamide, carbonyl, amino, carboxyl, and hydroxyl groups, to immobilize the chromium ions.
Equilibrium biosorption experiments were carried out to investigate the effects of pH values and contact
time. Adsorption isotherms were modeled with the Langmuir and Freundlich equations and isotherm
constants were calculated. Kinetic experiments showed the rapid process of biosorption and the pseudosecond-
order model was successfully applied to predict the rate constant of biosorption. This study firstly
discovered the kinetics equilibrium modelling of L. hexandra Sw. biomass on biosorption Cr(VI) and Cr(III).

Keywords:
Leersia hexandra Swartz
Chromium ions
Adsorption
Mechanisms
Kinetics

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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 333 (2009) 71–77

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

Versi lain/terkait

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