Efficient polymers in conjunction with membranes to remove As(V) generated in situ by electrocatalytic oxidation

Abstract

International audienc

Arsenic extraction from aqueous solution: Electrochemical oxidation combined with ultrafiltration membranes and water-soluble polymers

“…At first, conductivity measurements were performed in aqueous solutions containing increasing concentrations of different polymers used in this study. As expected, both the concentration and molecular weight of polymers significantly influence solution conductivity [14]. Increasing polymer size and concentration simultaneously diminished the conductivity values but all the investigated polymers can overall be regarded as efficient electrolytes whose conductivity values fall in the range of commonly used aqueous electrolytes.…”

“…The counter ion Cl − on the water-soluble polymer was important factor in order to obtain a lower oxidation potential during the electrolysis, it was due to better charge transport by this class of support water-soluble polymers. All the investigated polymers can overall be regarded as efficient electrolytes whose conductivity values fall in the range of commonly used aqueous electrolytes [14].…”

“…The electrochemical oxidation of arsenite combined with adsorption [11] or membrane ultrafiltration procedures [13,14] have recently emerged as efficient strategies to remove arsenic from contaminated aqueous solutions.…”

Removal of arsenic from water by combination of electro‐oxidation and polymer enhanced ultrafiltration

“…Electrochemical oxidation of arsenite to arsenate combined with adsorption or liquid‐phase polymer‐based retention process have recently emerged as efficient strategies to remove arsenic from contaminated aqueous solutions . The advantage to use the coupled technique is the dual use of water‐soluble polymer, as a support electrolyte in oxidation of As(III) and as extracting material during the ultrafiltration, avoiding the use of external reagents in the process.…”

“…Since pore size of ultrafiltration membranes are not suitable to separate heavy metal ions, water‐soluble polymers are used to bind the metals to form macromolecular complexes. These large molecules having a higher molecular weight than the molecular mass cut off, MMCO of the membrane, will be retained, while the non‐complexed ions pass through the membrane .…”