Contamination of water with toxic substances due to rapid
urbanization has become a worldwide cause of concern. Among these substances,
arsenic occupies the topmost position in the priority list of hazardous
substances given by ATSDR. Hence in the present study in order to eliminate the
extra step of oxidizing As(III) in the process of arsenic removal by
adsorption, a composite of acid-functionalized nanoporous carbon (Af-NPC) with
MnO2 nanoparticles was synthesized. Nanoporous carbon (NPC) structures synthesized
from grass clippings mown at the yard were acid-functionalized and coated with
manganese oxide nanoparticles at room temperature. The synthesized composite
was characterized by FTIR, XRD, BET, TEM, TGA and XPS. Characterization results
showed the formation of an acid-functionalized nanoporous carbon/MnO2
(Af-NPC/MnO2) composite which was amorphous in nature. Af-NPC/MnO2 was further
explored for the removal of As(III) and As(V) from the aqueous medium. Effects
of factors such as pH, contact time, initial concentration and interfering ions
on the adsorption of arsenic by Af-NPC/MnO2 were studied in detail. The
mechanism of adsorption was also studied using experimental data determined.
The kinetic study indicated that removal of arsenic followed pseudo-second-order
kinetics and the experimental equilibrium data fitted better in the Langmuir
isotherm model with maximum monolayer adsorption capacity of 8.85 mg/g and 9.43
mg/g for As(III) and As(V), respectively. The removal rate of arsenic was found
to be very fast compared to other adsorbents. The results of this study imply
that Af-NPC/MnO2 is an efficient adsorbent for the removal of As(III) and As(V)
from an aqueous medium.
Author(s) Details:
Shahin Pathan,
Department of Chemical Sciences, Sunandan Divatia School of Science,
NMIMS University, Vile Parle (West), Mumbai 400056, India and K.J. Somaiya
Institute of Technology, Sion(E), Mumbai-400022, India.
Nancy Pandita,
Department
of Chemical Sciences, Sunandan Divatia School of Science, NMIMS University,
Vile Parle (West), Mumbai 400056, India.
Nand Kishore,
Department of Chemistry, Indian Institute of Technology Bombay,
Powai, Mumbai-400076, India.
Please see the link here: https://stm.bookpi.org/CICMS-V5/article/view/13131
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