Removal of arsenic(V) ions from aqueous media by adsorption onmultiwall carbon nanotubes thin film using XRF technique

PEDRO R. ARANDA, IVAN LLORENS, ERNESTO PERINO, IRMA DE VITO, JULIO RABA

Environmental Nanotechnology, Monitoring &

Elsevier

Lugar: Amsterdam; Año: 2016 vol. 5 p. 21 - 26

2215-1532

tA solid phase extraction using multiwalled carbon nanotubes, modified with a tertiary amine, ALIQUAT336, has been developed as a preconcentration technique for the determination of trace amounts ofAs(V) in water samples. After "batch-based mode" As(V) adsorption on ALIQUAT 336-Multiwalled carbonnanotubes, determinations were made directly on the solid by X-Ray Fluorescence spectrometry, whichreduces the number of reagents used and minimizes the sample handling.The method herein described combines the advantages of solid phase extraction with the benefits ofany X-Ray Fluorescence method associated to the large areas held by the carbon nanotubes, which makethem a promising solid sorbent for preconcentration procedures.The enrichment factor was calculated considering that the thin film obtained from the 100 mL solutionof 1000 g L-1As had a final thickness of 0.04 mm and a final diameter of 16.7 mm, the volume depositedon the pellet was 0.0088 cm3. Thus the preconcentration factor obtained was 104fold, which representeda highly satisfactory value for trace analysis by X-Ray Fluorescence.Satisfactory results were obtained for the determination of arsenic in samples of the standard referencematerial "NIST 1643e?Trace Elements in Water and drinking water".© 2016 Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.