Improving Membrane Filtration for Copper Speciation: Optimal Salt Pretreatments of Polyethersulfone Membranes to Prevent Analyte Retention.

ABSTRACT: Membrane filtration has been increasingly used to separate dissolved metal ions from dispersed particles, commonly using ultrafiltration membranes, for example, polyethersulfone (PES) membranes with a molecular weight cut-off of 3 kDa. The disadvantage of this technique is an undesired retention of ions, resulting from Coulomb interactions with sulfonic acid groups of the membrane. Therefore, such a membrane acts similar to a cation exchanger column. We solved this drawback by a pretreatment of the PES membrane by other cations. Using CuSO₄ as a model compound, we compared the effectiveness of five cations using their salt solutions (Ca²⁺, Mg²⁺, Fe²⁺, Ag⁺, Ba²⁺) as pretreatment agents and identified the most effective pretre

SUBMITTER: Graf T 

PROVIDER: S-EPMC9933229 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature