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High efficient adsorption and storage of iodine on S, N co-doped graphene aerogel
- Liu, Beibei, Ren, Xiaohua, Chen, Long, Ma, Xiaoxin, Chen, Qiong, Sun, Qidi, Zhang, Lin, Si, Pengchao, Ci, Lijie
- Journal of hazardous materials 2019 v.373 pp. 705-715
- adsorption, aerogels, graphene, hot water treatment, iodine, models, nitrogen, radioactive waste, sorption isotherms, sulfur
- High efficient adsorption of radioiodine in nuclear waste has attracted extensive attentions all over the world. In this work, we fabricated sulfur and nitrogen co-doped graphene aerogels (SN-GA) through one-step hydrothermal method, and investigated its iodine adsorption behavior including adsorption kinetics and isotherms in water. Our results reveal that SN-GA exhibits a 3D porous architecture with thiophene-S, oxidized-S, pyridine-N, pyrrole-N and graphite-N co-doped into the sp2 carbon frameworks. The adsorption experiment showed SN-GA has a maximum iodine adsorption capacity of 999 mg g−1 determined by Langmuir isotherm, and the adsorption process could be better described by the pseudo-second-order model.