文献类型：期刊文献

英文题名：Graphene oxide as a novel adsorbent for highly efficient removal of UO22+ from water

作者：Hu, Baowei[1];Hu, Qingyuan[2];Li, Xue[2];Pan, Hui[2];Huang, Chengcai[1];Chen, Chengguang[2]

机构：[1]Shaoxing Univ, Sch Life Sci, Huancheng West Rd 508, Shaoxing 312000, Zhejiang, Peoples R China;[2]Shaoxing Univ, Coll Yuanpei, Qunxian Middle Rd 2799, Shaoxing 312000, Zhejiang, Peoples R China

年份：2017

卷号：79

起止页码：178

外文期刊名：DESALINATION AND WATER TREATMENT

收录：SCI-EXPANDED(收录号：WOS:000408477000019)、、WOS

基金：Financial supports from the Science and Technology Project of Shaoxing (2014B70041) are acknowledged.

语种：英文

外文关键词：Graphene oxide; Uranium; Absorption; Isotherm; Water

外文摘要：In this paper, the use of graphene oxide (GO), high efficiency and low-risk adsorbent, has been studied for the removal of UO22+ from aqueous solutions. A series of experiments was conducted in a batch system to assess the effect of the system variables, i.e. contact time, initial pH, ionic strength, temperature, solid concentration and humic substances. The results indicated that the uptake is strongly dependent on pH but independent of ionic strength. A stimulative effect of HA/FA on UO22+ uptake was found at pH < 7.0, whereas inhibitory effect was observed at pH > 7.0. The adsorption kinetics of UO22+ uptake on GO was found to follow pseudo-second-order rate kinetic model very well, with a good correlation (R-2 > 0.99), indicating that the chemical adsorption was the rate-limiting step. The Linear, Langmuir, Freundlich, and Dubinin-Redushkevich (D-R) isotherms were used to analyze the equilibrium data at different temperatures, and the Langmuir isotherm model fits the sorption isotherms significantly better than the other three models. The maximum uptake capacity (qmax) reached 2.3532 x 10(-4) mol.g(-1) at 338 K, it is estimated by Langmuir. The thermodynamic analysis derived from temperature dependent uptake isotherms suggests that the uptake process of UO22+ on GO is spontaneous and endothermic. Results also showed that the GO was favourable adsorbent for UO22+.