Removal of arsenic using synthetic iron oxyhydroxide
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Date
2018-06
Authors
Nur Aina Najeehah Mohd Aaznan
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Abstract
Removal of arsenic from mine waste water using iron-oxide-based absorbents are
getting prevalent as using the absorbents are simpler and of low cost. In this research work,
selected samples of synthetic iron oxyhydroxide powder were obtained. After
characterization, these sample powders were used as an absorbent in the arsenic removal
experiment. The powdered samples were placed in separate 250 mL conical flask containing
100 mL of As (V) standard solution of varying concentrations (5, 7, and 9 ppm). The
experiment was conducted for 8 hours with 20 mL volume of aliquot samples taken at 1, 3, 5,
and 8 hours interval hour. The concentration of the As after the removal experiment in each
aliquot sample was analysed using ICP-OES. The XRD pattern of the powdered samples
obtained showed major characteristic peaks of goethite and hematite. Surface morphology of
the powdered samples displayed dendritic features and were highly porous. These features
were found to enhance the recovery of As from the standard solution prepared. The
percentage of As removed at varying concentration of As was found to be in the range of
28.9% to 99.2%. The solid residues after the arsenic removal experiment were also
characterised. From XRD phase analysis, the presence of arsenic oxide (As2O3) was
detected. The surfaces of the solid residues were observed to be smoother and less dendritic
from the SEM photomicrograph. It can be assumed that arsenic species were adsorbed into
the pores on the surface of the synthetic iron oxyhydroxide powder samples after the arsenic
removal experiment.