Efficient removal of bacteria from aqueous environments is a hot research topic. Graphene oxide (GO) has been widely used due to its antimicrobial properties and high surface activity. However, GO alone could not remove bacteria from the aqueous environment through aggregation and precipitation. In this study, CaCl (Ca) was introduced into the process of bacterial removal by GO due to the negative charge on the surface of the removed bacteria (). The introduction of Ca leads to the re-accumulation of GO layers, and the proportion of oxygen-containing functional groups in GO increases significantly. AFM and zeta potential results indicate a reduction in the negative charge on the GO surface in the presence of Ca, which reduces the electrostatic repulsion to bacteria. This leads to a gradual increase in the attractiveness of the GO surface and the adsorption of more bacteria. Ca acts as a bridge, facilitating the sedimentation of GO and bacteria, resulting in the removal of bacteria from the water environment. The removal efficiency of GO against bacteria increased as the concentration of Ca increased.

中文翻译：

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钙促进细菌在氧化石墨烯表面的吸附和沉淀

从水环境中有效去除细菌是一个热门研究课题。氧化石墨烯（GO）由于其抗菌性能和高表面活性而被广泛应用。然而，单独的GO不能通过聚集和沉淀从水环境中去除细菌。在这项研究中，由于被去除的细菌表面带负电荷，CaCl（Ca）被引入到GO去除细菌的过程中（）。 Ca的引入导致GO层重新积累，GO中含氧官能团的比例显着增加。 AFM 和 zeta 电位结果表明，在 Ca 的存在下，GO 表面的负电荷减少，从而减少了对细菌的静电排斥。这导致GO表面的吸引力逐渐增加，并吸附更多的细菌。 Ca 充当桥梁，促进 GO 和细菌沉淀，从而去除水环境中的细菌。 GO对细菌的去除效率随着Ca浓度的增加而增加。