Fabrication, characterization and application of fully green superhydrophilic lignosulfonate multilayer films

摘要

A fully green superhydrophilic lignosulfonate (LGS) film was prepared by the layer-by-layer electric assembly (LBLEA). Experimentally, the voltage was varied from zero to 4 kV, and the electrostatic interaction (EI) was controlled in enhancement or reduction. Results showed that the surface of LGS film formed by common condition was in hydrophilic and formed by LBLEA corresponding to the 4 kV plus El-enhancement was in superhydrophilic. FESEM images comparison found that the superhydrophilic LGS film has smooth surface than that of the hydrophilic sample and ATR-FTIR spectra comparison found that the formation of superhydrophilic LGS film is due to the 4 kV El-enhancement-based LBLEA process caused the sulfonate groups moving from the bulk LGS to its surface. This superhydrophilic LGS film showed enhanced adsorption of copper (II) ions about 47% than that of the common LGS film. (C) 2017 Elsevier B.V. All rights reserved.