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Preparation of lignosulfonate-based nanofiltration membranes with improved water desalination performance.

ABSTRACT: Pulping and papermaking generate large amounts of waste in the form of lignosulfonates which have limited valorized applications so far. Herein, we report a novel lignosulfonate-based nanofiltration membrane, prepared by using polyethylenimine (PEI) and sodium lignosulfonate (SL) via a layer-by-layer (LbL) self-assembly. As a low-cost and renewable natural polyelectrolyte, SL is selected to replace the synthetic polyelectrolyte commonly used in the conventional LbL fabrication for composite membranes. The prepared LbL (PEI/SL)₇ membranes were crosslinked by glutaraldehyde (GA) to obtain (PEI/SL)₇-GA membranes with compact selective layer. We characterized (PEI/SL)₇ and (PEI/SL)₇-GA membranes to study the chemical compositions, morphologies, and surface hydrophilicity. To improve the nanofiltration performances of the (PEI/SL)₇-GA membranes for water desalination, we investigated the effects of the crosslinking time, GA concentration and the NaCl supporting electrolyte on membrane structure and performance. The optimized (PEI/SL)₇-GA membrane exhibited a permeating flux up to 39.6 L/(m²·h) and a rejection of 91.7% for the MgSO₄ aqueous solution 2.0 g/L concentration, showing its promising potential for water desalination. This study provides a new approach to applying the underdeveloped lignin-based biomass as green membrane materials for water treatment.

SUBMITTER: Liu W

PROVIDER: S-EPMC8182288 | biostudies-literature |

REPOSITORIES: biostudies-literature

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