Abstract
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 4kV, 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 4kV plus EI-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 4kV EI-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.
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