On the electrostatic interactions in the transfer mechanisms of iron during nanofiltration in high concentrated phosphoric acid

► Transfer during NF of concentrated phosphoric acid up to 5.9 M. ► Iron chelate with phosphoric acid and impact on NF performance and understanding. ► Mastering of phosphoric acid retention by H2PO4− monovalent anion in single solution. ► Negative rejection of chloride in 5.9 M and 1.2 M phosphoric acid in solution with iron chloride. ► Evidencing of electrostatic interaction occurrence in 5.9 and 1.2 M.