Removal Of Arsenic(iii) From Aquoes Soloutions By Carboxymethyl Cellulose-stabilized Nano Zero-valent Iron

Arsenic is the most hazardous element in the chemical world and its presence in drinkingrnwater can cause disaster. Conventional method of preparation of nano zero valent iron usingrnphysical and chemical methods normally employ toxic chemicals as reducing agents,rnorganic solvents, or non-biodegradable stabilizing agents, and are therefore potentiallyrndangerous to the environment and biological systems. Experiments were conducted in a batchrnsystem and the effects of pH, contact time, and the initial concentrations of Arsenic (III) andrnnanoscale zero valent iron doses were investigated. The nature and morphology ofrnsynthesized adsorbent were characterized by X-ray diffraction and Fourier transformrninfrared spectroscopy. The experimental results revealed that the removal efficiency ofrnArsenic (III) was increased with decreasing pH of the solution but decreased with gradualrnincreasing of initial concentration and dosage. The removal rate of Arsenic (III) was 97.4 % atrna dosage of 1.0 g, pH 2 and with 15g/L initial As(III) concentration. The experimental datarnwas found to be well described by Langmuir model. The maximum loading capacity asrnestimated by Langmuir model was 116.27 mg/g. Also, the adsorption trend followed thernpseudo-second order kinetics model and equilibrium was achieved in two hours. Overall, thernresults obtained indicate that CMC-Stabilized nZVI could be effectively used for removal ofrnArsenic (III) from waste water.

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