Absolute values of total charge, layer charge, edge charge and Zeta potential of CSN were lower than that of LSN suggesting that the loaded Cu2+ reduced the negative charge of silicate. This can enhance electrostatic interaction between CSN and bacteria.

• 另外，CSN的总电荷密度、层间电荷、端面电荷和Zeta电位的绝对值均低于LSN，说明所载铜可降低硅酸盐所带负电荷的密度，这有助于CSN与细菌间的静电吸附作用。