Formation of iron oxides under varying condition of PH, temperature and neutralization dosage
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Date
2017-07
Authors
Mohamad Nazmie Bin Mohd Sharipudin
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Abstract
Recently, schwertmannite, a ferric oxyhydroxy sulfate mineral, has attracted attention broadly due to its high sorption capacity for toxic arsenic species. This research work has been carried out on the synthesis and characterization of schwertmannite. The present study involved the synthesis of schwertmannite at varying condition such as speed of agitation, final pH, temperature and neutralization dosage. The parameters that has been used in this research work are speed of agitation (250 rpm and 350 rpm), final pH (<3.5 and >3.5), temperature (25°C and 60°C) and neutralization dosage (1000 μL and 2000 μL). The synthesized schwertmannite was obtained using modified neutralization method. This research work involved preliminary trial runs using the neutralization method and also modification that have been carried out. In the synthesis using the neutralization method, about 500 mL of 0.05 M 𝐹𝑒2(𝑆𝑂4)3 solution was mixed with 5 mL of 0.01 M 𝐻2𝑆𝑂4 solution to obtain an acidic environment in a reaction vessel. The experiment were followed by titration with 1 M of 𝑁𝑎2𝐶𝑂3 under stirred condition into the mixing solution at every one minute to adjust the final pH to 3-4. The rate of the titration was 1000 μL/min. The residue were filtered using filter paper and followed by drying in the oven for 24 hours at 60°C. The yellowish powder samples were ground before characterization process. The characterization process that involved in this research works is X-ray diffraction (XRD), scanning electron microscopy with energy dispersive X-ray microscopy (SEM/EDX) and particle size distribution (PSA-MALVERN). For XRD, the synthesized schwertmannite has shown the mineral phases such as Fe, S and O. From SEM/EDX analysis results showed that iron element was present in the precipitate. Particle size analysis shows that the 𝑋50 of the synthesized schwertmannite was in between 1.4 μm and 2.2 μm.