e-journal

Uptake of arsenate by an alginate-encapsulated magnetic sorbent: Process performance and characterization of adsorption chemistry

---

Abstract.
Arsenate removal by a calcium alginate-encapsulated magnetic sorbent was studied. The morphology,
microstructure, and composition properties of the sorbent were explored using X-ray diffraction (XRD)
and scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDX). The SEM study
demonstrates that there are many protuberances and pores on the sorbent surface; the XRD analysis
reveals that the sorbent consists of Fe3O4. The EDX analysis indicates that the adsorption on the surfaces
of sorbent is highly location dependent. The interaction characteristics between the arsenic and the
functional groups on the sorbent were studied by Fourier transform infrared spectroscopy (FTIR) and Xray
photoelectron spectroscopy (XPS). These studies indicate that the lattice oxygen in magnetite and the
oxygen in hydroxyl of the calcium alginate play important roles in the sorption of arsenate ions onto the
sorbent. More importantly, the XPS analysis demonstrates that the arsenate is reduced to arsenite after its
adsorption onto the sorbent. It is proposed that divalent iron and the alcoholic group in alginate provide
electrons to arsenate. A conceptual model for the adsorption is proposed to illustrate the mechanisms.

Keywords:
Adsorption
Arsenate
Arsenite
Calcium alginate-encapsulated magnetic
sorbent
Reduction

---

Ketersediaan

Tidak ada salinan data

Informasi Detail

Judul Seri

Journal of Colloid and Interface Science

No. Panggil

-

Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Colloid and Interface Science 333 (2009) 33–39

Bahasa

English

ISBN/ISSN

-

Klasifikasi

-

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

KIMIA

Info Detail Spesifik

-

Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

Komentar

---

Anda harus masuk sebelum memberikan komentar