Arsenate uptake by Al nanoclusters and other Al-based sorbents during water treatment - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Water Research Année : 2016

Arsenate uptake by Al nanoclusters and other Al-based sorbents during water treatment

Résumé

In many parts of the world, arsenic from geogenic and anthropogenic sources deteriorates the quality of drinking water resources. Effective methods of arsenic removal include adsorption and coagulation with iron- and aluminum-based materials, of which polyaluminum chloride is widely employed as coagulant in water treatment due to its low cost and high efficiency. We compared the arsenic uptake capacity and the arsenic bonding sites of different Al-based sorbents, including Al nanoclusters, polyaluminum chloride, polyaluminum granulate, and gibbsite. Extended X-ray absorption fine structure (EXAFS) spectroscopy revealed that As(V) forms bidentate-binuclear complexes in interaction with all Al-based removal agents. The octahedral configuration of nanoclusters and the distribution of sorption sites remain the same in all types of removal agents consisting of nano-scale Al oxyhydroxide particles. The obtained distances for As(V)-O and As(V)-Al agreed with previously published data and were found to be 1.69 +/- 0.02 angstrom and 3.17-3.21 angstrom, respectively. Our study suggests that As(V) binds to Al nanoclusters as strongly as to Al oxide surfaces. The As sorption capacity of Al nanoclusters was found to be very similar to that of Al clusters in a polyaluminum chloride. The most efficient AI-based sorbents for arsenic removal were Al nanoclusters, followed by polyaluminum granulate. (C) 2015 Elsevier Ltd. All rights reserved.

Dates et versions

hal-01426092 , version 1 (04-01-2017)

Identifiants

Citer

Jasmin Mertens, Jérôme Rose, Bernhard Wehrli, Gerhard Furrer. Arsenate uptake by Al nanoclusters and other Al-based sorbents during water treatment. Water Research, 2016, 88, pp.844-851. ⟨10.1016/j.watres.2015.11.018⟩. ⟨hal-01426092⟩
197 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More