Abstract：A quartz crystal microbalance with dissipation (QCM-D) was used to investigate the initial adsorption behavior of biofilm under four kinds of Na+ concentrations. The rigid model and viscoelastic model were fitted to explore the changes in adsorption mass and viscoelasticity with time. The results indicate that both reversible and irreversible adsorption processes occurred in the initial adsorption of biofilm. The formation of irreversible adsorption was promoted when Na+ concentration was 150mmol/L, due to increased zeta potential and net charge reduction in bacterial surfaces. With an increase in Na+ concentration from 2.5mmol/L to 50mmol/L, the adsorption rate increased gradually, which is consistent with the electrostatic double-layer theory. No significant change in the adsorption rate was observed when the concentration was increased to 150mmol/L. The softness of the absorbed layer in the 150mmol/L group was the highest, followed by the 2.5, 10 and 50mmol/L groups. An increase in the viscoelasticity of the layer was also observed during the early adsorption process. With an increase in Na+ concentration, the adsorption mass kept increasing and the viscoelasticity first increased and then remained unchanged.
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