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Highly Efficient Adsorption of Bulky Dye Molecules in Wastewater on Ordered Mesoporous Carbons

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We demonstrate, for the first time, the application of ordered mesoporous carbons with large pore
sizes prepared from the surfactant-templating approach in efficient disposal of wastewater containing
bulky dye molecules. The adsorption amount for the bulky dye (methylthionine chloride, fuchsin basic,
rhodamine B, brilliant yellow, methyl orange, or Sudan G) is almost twice that of the activated carbon
in which mesopores contribute almost 100% to the total surface area and volume. The ordered mesoporous
carbon adsorbent has a high adsorption rate (>99.9%) for low-concentration dyes, good performance in
decoloration regardless of the dye nature, including basic, acidic, or azo dyes, and high stability after
dye elution. To establish the relationship between the pore texture and adsorption properties, three kinds
of ordered mesoporous carbons with different pore sizes, surface areas, and pore volumes have been
synthesized by using phenolic resins as carbon sources and triblock copolymer as a structure-directing
agent. The XRD, TEM, and N2 sorption measurements reveal that all mesoporous carbonaceous materials
have the highly ordered 2D hexagonal mesostructure, high surface areas (398-2580 m2/g), large pore
volumes (0.51-2.16 cm3/g), and uniform pore sizes ranging from 4.5 to 6.4 nm. The adsorption capacities
are compared and the pore occupation is estimated to understand the adsorption behaviors in the ordered
mesopores with different diameters and models. The spatial effect of dye molecules is the determinative
factor for the adsorption in ordered mesoporous carbons with various pore textural properties. The
mesoporous carbon with an extremely high surface area (2580 m2/g), a large pore volume (2.16 cm3/g),
and bimodal pores (6.4 and 1.7 nm) prepared from the silica-carbon composite shows the highest
adsorption capacities for bulky basic dyes among the three ordered mesoporous carbons.

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Informasi Detail

Judul Seri

Chem. Mater.

No. Panggil

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Penerbit

: American Chemical Society., 2009

Deskripsi Fisik

Chem. Mater. 2009, 21, 706–716

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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