Removal Of Arsenic(III) from Aquoes Soloutions by CarboxyMethyl Cellulose-Stabilized Nano Zero-Valent Iron
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Date
2019
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Addis Ababa University
Abstract
Arsenic is the most hazardous element in the chemical world and its presence in drinking
water can cause disaster. Conventional method of preparation of nano zero valent iron using
physical and chemical methods normally employ toxic chemicals as reducing agents,
organic solvents, or non-biodegradable stabilizing agents, and are therefore potentially
dangerous to the environment and biological systems. Experiments were conducted in a batch
system and the effects of pH, contact time, and the initial concentrations of Arsenic (III) and
nanoscale zero valent iron doses were investigated. The nature and morphology of
synthesized adsorbent were characterized by X-ray diffraction and Fourier transform
infrared spectroscopy. The experimental results revealed that the removal efficiency of
Arsenic (III) was increased with decreasing pH of the solution but decreased with gradual
increasing of initial concentration and dosage. The removal rate of Arsenic (III) was 97.4 % at
a dosage of 1.0 g, pH 2 and with 15g/L initial As(III) concentration. The experimental data
was found to be well described by Langmuir model. The maximum loading capacity as
estimated by Langmuir model was 116.27 mg/g. Also, the adsorption trend followed the
pseudo-second order kinetics model and equilibrium was achieved in two hours. Overall, the
results obtained indicate that CMC-Stabilized nZVI could be effectively used for removal of
Arsenic (III) from waste water.
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Keywords
Arsenic, nano zero valent iron, Adsorption