Efficient degradation of selected polluting dyes using the tetrahydroxoargentate ion, Ag(OH)4-, in alkaline media

Ileana R Zamora-Garcia; Alejandro Alatorre-Ordaz; Jorge G Ibanez; Julio C Torres-Elguera; Kazimierz Wrobel; Silvia Gutierrez-Granados

doi:10.1016/j.chemosphere.2017.10.041

Efficient degradation of selected polluting dyes using the tetrahydroxoargentate ion, Ag(OH)₄^-, in alkaline media

Chemosphere. 2018 Jan:191:400-407. doi: 10.1016/j.chemosphere.2017.10.041. Epub 2017 Oct 7.

Authors

Ileana R Zamora-Garcia¹, Alejandro Alatorre-Ordaz², Jorge G Ibanez³, Julio C Torres-Elguera¹, Kazimierz Wrobel¹, Silvia Gutierrez-Granados¹

Affiliations

¹ Departamento de Quimica, Unidad Pueblito de Rocha, Campus Guanajuato, Universidad de Guanajuato, Cerro de la Venada s/n, Col. Pueblito de Rocha, CP 36040, Guanajuato, Mexico.
² Departamento de Quimica, Unidad Pueblito de Rocha, Campus Guanajuato, Universidad de Guanajuato, Cerro de la Venada s/n, Col. Pueblito de Rocha, CP 36040, Guanajuato, Mexico. Electronic address: alatorre@ugto.mx.
³ Depto. de Ing. y Ciencias Quimicas, Centro Mexicano de Quimica Verde y Microescala, Universidad Iberoamericana-Ciudad de Mexico, Prol. Reforma 880, 01219, Mexico City, Mexico.

PMID: 29054080
DOI: 10.1016/j.chemosphere.2017.10.041

Abstract

The use of soluble and highly oxidizing Ag(III) in the form of the tetrahydroxoargentate ion Ag(OH)₄^- is reported for the oxidation of surrogate organic recalcitrant dyes (i.e., rhodamine 6G (Rh6G) and fluorescein (Fl)). The possible use of Ag(OH)₄^- for the treatment of these and other refractory compounds is assessed. Such dyes were selected due to their common occurrence, stability, refractory nature, the relatively high toxicity of Rh6G, and their structural similarity to Fl. Several reaction intermediates/products were identified. The results showed that the highly oxidizing tetrahydroxoargentate anion was capable of degrading these recalcitrant dyes. Furthermore, the final degradation products do not represent a higher environmental risk than the original surrogates themselves. In addition, the partial mineralization of the dyes was proven.

Keywords: Fluorescein; Indirect redox process; Pollutant oxidation; Rhodamine; Tetrahydroxoargentate ion.

MeSH terms

Coloring Agents / chemistry*
Environmental Pollutants / chemistry*
Ions / chemistry
Oxidation-Reduction
Rhodamines / chemistry
Silver / chemistry*

Substances

Coloring Agents
Environmental Pollutants
Ions
Rhodamines
rhodamine 6G
Silver