氧化石墨烯对U(Ⅵ)的吸附  

Sorption of U(Ⅵ) Onto Graphene Oxides

作　　者：肖宇琛 何森彪[1] XIAO Yu-chen;HE Sen-biao(Shaoxing Jishan High School,Shaoxing 312000,China)

机构地区：[1]绍兴市稽山中学

出　　处：《核化学与放射化学》2019年第2期228-232,共5页Journal of Nuclear and Radiochemistry

摘　　要：氧化石墨烯由于具有高比表面积和大量含氧功能基团,在放射性核素的高效富集方面引起广泛的关注。利用自制的氧化石墨烯作为吸附剂,研究了不同实验条件下对放射性废水中U(Ⅵ)的吸附行为,研究了pH、离子强度、温度和氧化石墨烯浓度对U(Ⅵ)吸附的影响。结果表明,氧化石墨烯对U(Ⅵ)的吸附主要是形成内层表面络合物,具有很强的去除能力,是目前所有材料中对U(Ⅵ)吸附能力最强的材料之一。吸附后的石墨烯经强酸处理后可以实现循环利用,而且吸附能力没有明显降低,但是弱酸处理不能使吸附的铀从石墨烯表面解吸。随着未来技术的发展,氧化石墨烯能够低成本大量制备后,在放射性废水处理中将具有重要的应用前景。Graphene oxides(GOs) have attracted multidisciplinary attentions because of their excellent properties such as high surface area and large amount of oxygen-containing functional groups. In this paper, the as-synthesized GOs were applied as adsorbents for the elimination of U(Ⅵ) from aqueous solutions under different experimental conditions. The effects of pH, ionic strength, temperature and concentration of GOs on the sorption of U(Ⅵ) were studied intensively. The results show that the sorption of U(Ⅵ) on GOs is mainly dominated by the formation of inner-sphere surface complexation. After sorption, the adsorbed U(Ⅵ) can be desorbed from GOs completely after the treatment with high concentration of acid. And GOs can be reused for the sorption of U(Ⅵ) without obvious decrease of sorption ability. GOs may be a very suitable nanomaterial in the treatment of radioactive wastewater in future.

关 键 词：氧化石墨烯 吸附 放射性核素 U(Ⅵ) 作用机理 

分 类 号：TL941.21[核科学技术—辐射防护及环境保护] X591[环境科学与工程—环境工程]