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应用同步辐射真空紫外圆二色光谱、紫外-可见及红外光谱等技术研究了氧化石墨烯(Graphene Oxide,GO)与腐殖酸(Humic Acid,HA)在水溶液中的相互作用,探讨了不同配比、溶液p H及不同温度条件下GO与HA之间的相互作用对GO在水溶液中形态的影响。研究表明,一定条件下GO在水溶液中显示出圆二色性,其强弱与GO在水溶液中的形态结构有关。HA可通过极性相互作用和π-π相互作用吸附在GO表面,形成GO-HA复合物,改变体系的圆二色性,这种影响与二者的质量比、水环境p H和温度相关。GO-HA与GO相比,厚度增加,分散性提高,圆二色信号降低;GO-HA体系p H值升高和温度降低,有利于GO-HA折叠构象的形成,使得体系的圆二色信号升高。
The interaction between graphene oxide (GO) and humic acid (HA) in aqueous solution was studied by synchronous violet vacuum dichroism spectroscopy, ultraviolet-visible and infrared spectroscopy, The effect of the interaction between GO and HA on the morphology of aqueous solution was studied by the interaction between p H and solution p H and at different temperatures. The results show that under certain conditions, GO shows circular dichroism in aqueous solution, and its strength is related to the morphological structure of GO in aqueous solution. HA can be adsorbed on the surface of GO by polar interaction and π-π interaction to form GO-HA complex and change the circular dichroism of the system, which is related to the mass ratio of the two, pH of water environment and temperature . Compared with GO, GO-HA increased the thickness and dispersion and decreased the circular dichroism signal. The increase of p H value and decrease of temperature of GO-HA system were in favor of the formation of GO-HA folded conformation, Signal is rising.