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12.
SEM, TEM, PXRD and Equilibrium Study of Heavy Metal Sorption on
Weathered Basaltic Andesite Products
Rajesh Singha,*,
Bhavna A. Shaha, Sujatab
aDepartment
of Chemistry, Veer Narmad South Gujarat University, Udhna Magdalla
Road, Surat – 395007, India
bDepartment of Chemistry, Indian Institute of Technology,
Roorkee, Roorkee – 247667, India.
* Corresponding author: Tel.: +91 94271 39533
E-mail:
rs.chemistry@gmail.com
Abstract: The use and application of
clay minerals as a sorbent in minimization of environmental
pollution has shown enormous potential. The surface morphology plays
a significant role in determining the surface availability. The
objective of this study was to evaluate the sorptive ability of
Weathered Basaltic Andesite Products (WBAP) for heavy metal ions and
the effect of surface morphology on the sorption of the contaminants
on the WBAP surface, and the change in its structure as well as
morphology. The surface characteristics of clean and saturated WBAP
were analyzed by scanning electron microscope (SEM) and transmission
electron microscope (TEM). Analysis of SEM micrographs of WBAP
showed smooth and rough surfaces. The rough surface constitutes
micropores, and is preferential site for the sorption of
contaminants. The selected area electron diffraction (SAED) pattern
of TEM photographs and PXRD patterns indicates change in
crystallanity. The effect of various parameters such as hydronium
ion concentration, shaking time, sorbent dose, initial metal ion
concentration, and temperature was studied for the sorption process.
Thermodynamic parameters (∆H0, ∆S0, and ∆G0) for the sorption
process were evaluated. Freundlich, Langmuir, and
Dubinin-Kaganer-Radushkevich isotherms were applied to the sorption
pattern on the WBAP. The sorption process was found to follows
Pseudo second order rate.
Keywords: Sorption, Andesite,
Electron microscope, Crystallanity
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