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核技术  2015 

同步辐射圆二色谱研究氧化石墨烯与腐殖酸的相互作用

DOI: 10.11889/j.0253-3219.2015.hjs.38.030101, PP. 30101-30101

Keywords: 氧化石墨烯,腐殖酸,相互作用,同步辐射圆二色谱

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Abstract:

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(GrapheneOxide,GO)与腐殖酸(HumicAcid,HA)在水溶液中的相互作用,探讨了不同配比、溶液pH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pH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pH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。

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