e-journal

Arsenic removal by iron-doped activated carbons prepared by ferric chloride forced hydrolysis

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Abstract.
Ferric chloride forced hydrolysis is shown to be a good method for increasing the iron content of activated
carbons (ACs). Iron content increased linearly with hydrolysis time, and ACs with iron content as high as
9.4 wt.% at 24 h hydrolysis time could be prepared. The increase in iron content did not produce any modification in the textural parameters determined by nitrogen adsorption at 77 K. Iron-based nanoparticles,
homogeneous in size andwell-dispersed in the carbon matrix,were obtained. Nanoparticles forming iron
(hydr)oxide agglomerates at the outer surface of the carbon grains at hydrolysis times higher than 6 h
were also produced. The AC obtained after 6 h of ferric chloride forced hydrolysis removed 94% of the arsenic present in a groundwater from the State of Chihuahua (Mexico), whereas the commercial AC used as precursor
allowed the removal of only 14%. The lower performance in arsenic removal observed for AC prepared
using long forced hydrolysis time (24 h) is probably due to the existence of iron (hydr)oxides nanoparticles
agglomerates, which once hydrated could prevent diffusion of arsenate (HAsO4−) towards the inner surface of the AC grain.

Keywords:
Activated carbon
Arsenic removal
Iron
Forced hydrolysis
Ground water

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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 168 (2009) 430–437

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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