氧化石墨烯对Th(Ⅳ)的吸附特性研究

Study on the Adsorption of Th(Ⅳ) on Graphene Oxide

针对污染水体中的放射性核素去除问题,采用Hummers法制备了氧化石墨烯,利用红外光谱、拉曼光谱、透射电镜和Zeta电位对氧化石墨烯的结构和表面形貌进行了表征。采用静态批式法研究Th(Ⅳ)在氧化石墨烯上的吸附行为,探讨了pH值、离子强度、腐殖酸等因素对吸附的影响。实验结果表明,pH值对吸附的影响很大,离子强度对吸附几乎没有影响;在pH<5时,腐殖酸浓度对吸附起到了促进作用,浓度越大对吸附的影响越强烈。研究结果表明氧化石墨烯可以作为放射性核素处理的一种潜在吸附材料。

For research on the treatment of radionuclides contaminated wastewaters, graphene oxide （GO） was prepared by Hummers methods, and characterized by infrared spectroscopy, Raman spectra, transmission electron microscope and zeta potential. The adsorption of Th （ Ⅳ ） on GO was studied by batch technique. Effect of pH, ionic strength, humic acid （ HA ） and fulvic acid（FA） on the adsorption of Th（ Ⅳ ） on GO was also investigated. Results indicated that the adsorption of Th（Ⅳ） is strongly dependent on solution pH, but is independent on ionic strength. In the presence of HA/FA, the adsorption of Th （ Ⅳ ） on GO increased below solution pH 5.0, while the adsorption of Th （ Ⅳ ） on GO decreased above solution pH 5.0. Results suggest that GO may be a promising candidate for cost-effective treatment of radionuclides contaminated wastewater.