Removal of Arsenic (V) ions from aqueous media by adsorption on Multiwall Carbon Nanotubes Thin Film using XRF technique

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

Environmental nanotechnology, monitoring and management

Elsevier B.V.

Año: 2015

2215-1532

A solid phase extraction using multiwalled carbon nanotubes, modified with a tertiary amine, ALIQUAT 336, has been developed as a preconcentration technique for the determination of trace amounts of As(V) in water samples. After ?batch-based mode? As(V) adsorption on ALIQUAT 336- Multiwalled carbon nanotubes, determinations were made directly on the solid by X-Ray Fluorescence spectrometry, which reduces the number of reagents used and minimizes the sample handling.The method herein described combines the advantages of solid phase extraction with the benefits of any X-Ray Fluorescence method associated to the large areas held by the carbon nanotubes, which make them a promising solid sorbent for preconcentration procedures. The enrichment factor was calculated considering that the thin film obtained from the 100 mL solution of 1000 µg L-1 As had a final thickness of 0.04 mm and a final diameter of 16.7 mm, the volume deposited on the pellet was 0.0088 cm3. Thus the preconcentration factor obtained was 104 fold, which represented a highly satisfactory value for trace analysis by X-Ray Fluorescence.Satisfactory results were obtained for the determination of arsenic in samples of the standard reference material "NIST 1643e - Trace Elements in Water and drinking water.