Selenium adsorption to aluminum-based water treatment residuals

Ippolito, J.A. and Scheckel, K.G. and Barbarack, K.A. (2009) Selenium adsorption to aluminum-based water treatment residuals. Journal of Colloid and Interface Science. 338:48-55.

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Abstract

Aluminum-based water treatment residuals (WTR) can adsorb water- and soil-borne P, As(V), As(III), and
perchlorate, and may be able to adsorb excess environmental selenium. WTR, clay minerals, and amorphous
aluminum hydroxide were shaken for 24 h in selenate or selenite solutions at pH values of 5–9,
and then analyzed for selenium content. Selenate and selenite adsorption edges were unaffected across
the pH range studied. Selenate adsorbed on to WTR, reference mineral phases, and amorphous aluminum
hydroxide occurred as outer sphere complexes (relatively loosely bound), while selenite adsorption was
identified as inner-sphere complexation (relatively tightly bound). Selenite sorption to WTR in an anoxic
environment reduced Se(IV) to Se(0), and oxidation of Se(0) or Se(IV) appeared irreversible once sorbed to
WTR. Al-based WTR could play a favorable role in sequestering excess Se in affected water sources.

Item Type:	Article
NWISRL Publication Number:	1317
Subjects:	Soil Soil > Chemistry
Depositing User:	Users 6 not found.
Date Deposited:	30 Nov 2009 22:07
Last Modified:	14 Oct 2016 15:03
Item ID:	1340
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/1340