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Mesoporous -Alumina/Hematite (-Al2O3/Fe2O3) Composite Nanofibers for Heavy Metal Removal

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-alumina/hematite (-Al2O3/Fe2O3) composite nanofibers were synthesized via electrospinning followed by calcination and optimized towards heavy metal removal (i.e., Cr(VI)). The composite nanofibers were characterized for their morphological and materials properties and tested in aqueous solutions containing chromate (CrO2– 4) to analyze their adsorption performance. Although, synthesized nanofibers have similar average diameter from 23 to 26 nm independent of the composition, BET analysis showed an increase in specific surface area with increasing Al content from 59.2 to 92.8 m2/g. This suggests the synergy of -Al2O3 and Fe2O3 causing increased surface roughness and greater porosity. The CrO–2 4 adsorption capacity increased with increase in Al content. For example, -Al2O3/Fe2O3 nanofibers with 32 wt.% of Al have an adsorption capacity of 169.5 mg/g, which is twice the value of the pure Fe2O3 nanofibers and over a 3-fold increase compared to the commercial Fe2O3 nanoparticles. The study shows that the composite of hematite and -alumina has better physical properties (e.g., larger surface area, smaller pore size, larger pore volume, etc.) and, in turn, enhanced adsorption removal of heavy metal pollutants.
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Keywords: ADSORPTION; ELECTROSPINNING; HEAVY METALS; NANOFIBERS; NANOTECHNOLOGY; WATER AND WASTEWATER TREATMENT

Document Type: Research Article

Publication date: January 1, 2017

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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