title: Electro-oxidation of As(III) with dimensionally-stable and conductive-diamond anodes.
abstract: In this work, arsenic oxidation by an electrochemical process was studied in a batch bench-scale electrolysis plant equipped with mono- and bi-compartment cells, dimensionally-stable anodes (DSAs) and conductive-diamond anodes (CDAs). The results demonstrate that the electrolysis is an adequate technology to transform As(III) into As(V) species, which is an important pre-treatment stage for removing of arsenic from water using technologies such as coagulation or electro-coagulation. The process requires large current densities in non-divided cells to obtain a good As(V)/As(III) ratio, but it can be more efficiently performed at low current densities in cells divided by cationic membranes. The presence of chlorides or sulphates can significantly affect the results due to the formation of powerful oxidants that contribute to the net oxidation process.
authors.affiliation: Department of Chemical Engineering, Facultad de Ciencias Químicas, Universidad de Castilla La Mancha, Campus Universitario s/n, 13071 Ciudad Real, Spain.
authors.forename: Engracia
authors.initials: E
authors.lastname: Lacasa
authors.forename: Pablo
authors.initials: P
authors.lastname: Cañizares
authors.forename: Manuel A
authors.initials: MA
authors.lastname: Rodrigo
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Fernández
mesh_terms: D001151:Arsenic / Q000737:chemistry*; D018130:Diamond / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D010084:Oxidation-Reduction
chemical_list: D018130:Diamond; D001151:Arsenic