VIBRATIONAL STUDIES OF ABSORPTION CARVONE ON SOME SURFACES
G.Damian1, V.Miclăuş2, I. Moldovan1, M.Puia1
“Babeş-Bolyai” University, Department of Physics, Cluj-Napoca,
Romania
2
“Babeş-Bolyai” University, Department of Chemistry, Cluj-Napoca,
Romania
1
FT-Raman and FT-infrared spectroscopy have been used to investigate the sorption
mechanisms of carvone (C10H14O) onto Al2O3, NaX zeolites and ZnO as a model for pollutant
interactions with soil [1-3]. Soil and clay environmental samples are complex, heterogeneous
mixtures of minerals. Therefore, model systems such as alumina, zeolites and mineral oxides
are studied by vibrational spectroscopy so that a fundamental understanding of organic
interactions with minerals can be obtained (Fig.1).Raman and infrared spectroscopy are both
vibrational spectroscopic techniques which are capable of probing the organic pollutantmineral oxide interface. Even though both techniques provide vibrational spectroscopic
information, they are complementary approaches. Raman spectroscopy of organic adsorption
to mineral oxides is challenging given the
limited sensitivity of the method. Infrared
spectroscopy is considered to be more
sensitive than Raman, but suffers from
serious interferences due to oxide
absorption. Along with relative immunity
Carvone
to oxide interference, Raman is also
immune to water in the sample matrix.
Since many mineral oxides such as silica
and alumina are expected to have water
hydrating their surfaces, they are more
difficult to analyze via infrared
ZnO+Carvone
spectroscopy, which shows strong
vibrational bands for water.
Carvone (2-Methyl-5-(1-methylethenyl)-2cyclohexene-1-one ) is a caraway essential
natural oil products (in the class of
ZnO
terpenes) occurring in plants as secondary
metabolites which are highly volatile and
3500
3000
2500
2000
1500
1000
500
exhibit very characteristic smells. This
-1
Wavenumber (cm )
compound exhibits a number of interesting
biological activities, eg., antifungal,
Fig.1 FT-Raman spectra of carvone, absorbed carvone
insecticidal and plant growth regulatory
on ZnO and powder ZnO
activities.
References
[1] V.S. Za k h ar e n ko , Catalysis Today 39 (1997) 243-249
[2] Yu.M. Ger s h e nzo n, S .G. Zv e ni go r o d s ki i, B . V . Ro ze n s hte i n , Russ. Chem. Rev. 59 (1990) 1601.
[3] P rasha n t S . C hi n ta wa r , Ho wa r d L. Gr ee ne , Applied Catalysis B: Environmental 14 (1997) 37-47
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