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Impregnating titanium phosphate nanoparticles onto a porous cation exchanger for enhanced lead removal from waters

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Abstract.
Titanium phosphate (TiP) exhibits preferable sorption toward lead ion in the presence of competing
calcium ions at high levels, however, it is present as fine or ultrafine particles and cannot be directly
employed in fixed-bed or any flow-through systems due to the excessive pressure drop and poor
mechanical strength. In the present study a new hybrid sorbent TiP-001 was fabricated by impregnating
titanium phosphate (TiP) nanoparticles onto a strongly acidic cation exchanger D-001 for enhanced lead
removal from waters. D-001 was selected as a host material mainly because of the Donnan membrane
effect resulting from the immobilized sulfonic acid groups bound on the exchanger matrix, which would
enhance permeation of the target metal cation prior to effective sequestration. TiP-001 was characterized
by transmission electron micrograph (TEM), X-ray diffraction (XRD), and pH-titration. Batch and column
sorption onto TiP-001 was assayed to evaluate its performance as compared to the host exchanger D-
001. Lead sorption onto TiP-001 is a pH-dependent process due to the ion-exchange nature, and its
sorption kinetics follows the pseudo-second-order model well. Compared to D-001, TiP-001 displays
highly selective lead sorption in the presence of competing calcium cations at concentration of several
orders higher than the target metal. Fixed-bed sorption of a synthetic feeding solution indicates that
lead retention by TiP-001 results in a conspicuous decrease of this toxic metal from 0.50 to below
0.010 mg/L (drinking water standard recommended by WHO). Moreover, its feasible regeneration by
dilute HCl solution also favors TiP-001 to be a feasible sorbent for enhanced lead removal from water.

Keywords:
Titanium phosphate
Hybrid sorbent
Cation exchanger
Lead removal
Nanocomposite

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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 331 (2009) 453–457

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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