Uranium(VI) adsorption on graphene oxide nanosheets from aqueous solutions
Uranium(VI) adsorption on graphene oxide nanosheets from aqueous solutions
复制标题
水溶液中氧化石墨烯纳米片对铀（VI）的吸附
DOI：
10.1016/j.cej.2012.09.030
复制
发表时间：
2012-11-01
影响因子：
15.1
通讯作者：
Shi, Weiqun
中科院分区：
文献类型：
--
作者：
Li, Zijie;Chen, Fei;Shi, Weiqun
用Hummers法制备的单层氧化石墨烯(GO)吸附水溶液中的铀(VI)离子。采用间歇法研究了U(VI)在空气中的吸附与溶液pH、离子强度和U(VI)初始浓度的关系。结果表明，吸附速度快，对pH有很强的依赖性，在pH 4.0~7.5范围内达到吸附平台期，与离子强度无关。这表明U(VI)在GO上形成了内球表面络合物。在pH为4.0时，GO对U(VI)的最大吸附容量为299 mg/g，是迄今报道的对U(VI)最有效的吸附剂之一。GO丰富的含氧官能团在吸附过程中起着至关重要的作用。利用得到的不同温度下的分配系数，计算了吸附的热力学参数，表明吸附是吸热的、自发的。GO可能是一种很有前途的吸附材料，可用于铀污染的环境净化和从大量溶液中浓缩铀。(C)2012爱思唯尔B.V.保留所有权利。
Single-layered graphene oxide (GO) prepared by the Hummers method was used to adsorb U(VI) ions from aqueous solutions. The U(VI) sorption was studied as a function of solution pH, ionic strength, and initial concentration of U(VI) using a batch method in air. It is found that the sorption is rapid, strongly dependent on pH, attaining a plateau at pH 4.0-7.5, and independent of the ionic strength. This suggests the formation of inner-sphere surface complexes of U(VI) on GO. The maximum sorption capacity of GO for U(VI) was evaluated to be 299 mg/g at pH 4.0, ranking it among the most effective sorbents reported for U(VI) so far. The abundant oxygen-containing functional groups of GO were demonstrated to play crucial roles in the sorption. Using the distribution coefficients obtained at different temperatures, thermodynamic parameters were also calculated, showing that the sorption is endothermic and spontaneous. GO could be a promising sorbent material applied in the environmental cleanup of uranium pollution and the enrichment of uranium from large volumes of solution. (C) 2012 Elsevier B.V. All rights reserved.