Lignin-based Nanofiltration Membrane with High Permeability, Acid-alkali and Chlorine Resistances toward the Removal of Multivalent Salts and Dyes

A lignin-based nanofiltration membrane was fabricated using aminated lignin and trimesoyl chloride as raw materials by an interfacial polymerization approach. The obtained membrane possesses excellent pure water permeability (31.2 L m−2 h−1 bar−1), high retention rates (>95%) to multivalent salts (EDTA and sodium citrate) and organic dyes (brilliant blue R and congo red), satisfactory acid-alkali and chlorine resistances, and separation-performance stability. It also shows better retention capability and alkaline stability than those of a membrane fabricated with pristine alkali lignin due to the high crosslinking degree. A lignin-based membrane was fabricated using aminated lignin and trimesoyl chloride as raw materials by interfacial polymerization. The membrane possesses excellent water permeability, high retention rates to multivalent salts and organic dyes, satisfactory acid-alkali and chlorine resistances, and separation-performance stability. It also shows better retention capability and alkaline stability than those of the membrane fabricated with pristine alkaline lignin.