Arsenite retention properties of water-soluble metal-polymers

BERNABE L. RIVAS, MARÝA DEL CARMEN AGUIRRE

JOURNAL OF APPLIED POLYMER SCIENCE

JOHN WILEY & SONS INC

Año: 2007 vol. 106 p. 1889 - 1894

0021-8995

                                        Abstracts The properties of water-soluble metal-polymers to retain As(III) from aqueous solution are investigated. Poly(acrylic acid)s with different tin contents are prepared. Amounts of 3, 5, 10, and 20 wt-% of tin are added to the polymer. The metal compositions are evaluated by thermogravimetry (TG-DSC) and atomic absorption spectroscopy. Structural properties are analyzed by infrared and H1 nuclear magnetic resonance  spectroscopy, and X-ray diffraction.  Additionally, specific surface area was measured using  CO2 as adsorbate. Arsenic retention properties are studied using the liquid-phase polymer-based retention (LPR) technique.  The polymers can bind arsenic species from an aqueous solution in the pH range 4- 8. The studies show that the retention capacity is a function of tin content and polymer concentration. At pH 8, the following mol ratios poly(AA)-Sn: As(III) are analyzed: 600:1, 400:1, 200:1, 100:1, and 20:1. The highest retention, 80 %, is obtained with poly(AA)-Sn at 10 wt-% and 20 wt-% of tin at mole ratios 400:1, and at nearly 20:1 or 40:1 Sn-As(III). The highest retention is observed at pH 8 and 4.  2007 Wiley Periodicals, Inc.