Res. Chem. Intermed.
, Vol. 34, Nos 8–9, pp. 743–753 (2008)
Koninklijke Brill NV, Leiden, 2008.
Also available online - www.brill.nl/rci
Adsorption of benzene onto mesoporous silicates modiﬁed
THUY-DUONG NGUYEN-PHAN, CHAE YOUNG LEE, JIN SUK CHUNG
and EUN WOO SHIN
School of Chemical Engineering and Bioengineering, University of Ulsan,
Ulsan 680-749, South Korea
Received 22 May 2007; accepted 31 October 2007
Abstract—Mesoporous molecular sieve SBA-15 modiﬁed by titanium has been utilized for removing
organic pollutants, such as benzene, from air. Titanium was impregnated inside SBA-15 by wetness
impregnation after synthesis of SBA-15 (impregnation method) or was doped into the SBA-15
framework by the direct addition of Ti precursor into the sol during synthesis (doping method).
In the breakthrough curves for gas-phase benzene adsorption, Ti addition into SBA-15 resulted in
the enhancement of benzene adsorption capacity, depending on Ti loading amounts. An increase
in adsorption temperature remarkably reduced the benzene adsorption capacity, indicating that the
interaction between benzene and the materials was weak.
Keywords: Titanium; benzene adsorption; SBA-15; adsorption temperature.
Volatile organic compounds (VOCs) are air pollutants that can cause serious threats
to the environment and human health. Benzene is a typical VOC and an air
pollutant that exists in indoor and outdoor environments and mainly released from
petrochemical and chemical-related industries. Because of its strong toxicity, it
is dangerous to human bodies and environments. Habitual inhalation of a small
amount of benzene causes damage to the bone marrow, reproductive organs,
immune system and central nervous system, which leads to illness, infection,
infertility, cancer, mutation and even death [1, 2]. Therefore, the concentration of
benzene in air has been strictly regulated at the ppb level.
VOCs can be removed by several methods, including condensation, absorption,
catalytic oxidation, adsorption, bio-ﬁltration, incineration and photodecomposi-
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