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Sci Total Environ. 2016 Dec 15;573:1125-1131. doi: 10.1016/j.scitotenv.2016.08.071. Epub 2016 Sep 30.

Halide removal from aqueous solution by novel silver-polymeric materials.

Author information

1
Department of Inorganic Chemistry, University of Granada. 18071, Granada, Spain.
2
Department of Inorganic Chemistry, University of Granada. 18071, Granada, Spain; Eawag, Swiss Federal Institute for Aquatic Science and Technology, CH-8600, Dübendorf, Switzerland.
3
Eawag, Swiss Federal Institute for Aquatic Science and Technology, CH-8600, Dübendorf, Switzerland; School of Architecture, Civil and Environmental Engineering (ENAC), Ecole Polytecnique Fédérale de Lausanne, Ch-1015 Lausanne, Switzerland.

Abstract

The objective of this study was to analyze the behavior of a new material, silver-doped polymeric cloth (Ag-cloth), in the removal of bromide and iodide from waters. Silver is immobilized on the cloth, guaranteeing selective adsorption of the halide ions as retained silver halides that therefore do not pass into the solution. Results indicate that Ag0 reacts with H2O2 in the first phases of the process, yielding Ag+ and superoxide radical; however, as the process advances, this radical favors Ag+ reduction. Increases in the concentration of H2O2 augment the capacity of the Ag-cloth to remove halides from the medium up to a maximum concentration (55μM), above which the removal capacity remains constant (Xm≅1.3-1.8mg halide/g Ag-cloth). Thus, when there is excess H2O2 in the medium, secondary competitive reactions that take place in the process guarantee a constant Ag+ concentration, which defines the maximum adsorption capacity of Ag-cloth, reducing its ability to remove halides. Ag-cloth has a higher capacity to remove iodide than bromide, and the presence of organic matter or chloride reduces its capacity to remove iodide or bromide from water. The results obtained shown that the capacity of Ag0 with H2O2 significantly varies as a function of the medium pH from 1mg Br-/g Ag-cloth at very low pH to 1.6mg/g Ag-cloth at pH9.

KEYWORDS:

Ag-cloth; H(2)O(2); Halide; Selective chemisorption

PMID:
27697745
DOI:
10.1016/j.scitotenv.2016.08.071
[Indexed for MEDLINE]

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