版权说明 操作指南
首页 > 成果 > 详情

Removal of uranium (VI) from aqueous solution by adsorption of hematite

认领
导出
Link by DOI
反馈
分享
QQ微信 微博
成果类型:
期刊论文
作者:
Xie Shuibo;Zhang Chun;Zhou Xinghuo;Yang Jing;Zhang Xiaojian;Wang Jingsong
通讯作者:
Shuibo, X.
作者机构:
[Xie Shuibo] School of Urban Construction, University of South China, Hengyang, Hunan, PR China. xiesbmr@263.net
通讯机构:
[Xie Shuibo] Univ S China, Sch Urban Construct, 28 W Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.
语种:
英文
关键词:
Adsorption;Adsorption isotherm;Hematite;Uranium (VI) or U (VI)
期刊:
Journal of Environmental Radioactivity
ISSN:
0265-931X
年:
2009
卷:
100
期:
2
页码:
162-166
基金类别:
National Natural Science Foundation of China [10775065, 20707008]
机构署名:
本校为第一且通讯机构
院系归属:
土木工程学院
摘要:
Hematite, a type of inorganic-sorptive medium, was used for the removal of U (VI) from aqueous solutions. Variables of the batch experiments including solution pH, contact time, initial concentration, temperature, calcium and magnesium ions were studied. The results indicated that the adsorption capacities are strongly affected by the solution pH, contact time and initial concentration. A higher pH favors higher U (VI) removal. The adsorption was also affected by temperature and calcium and magnesium ions, but the effect is very weak. The maximum adsorption capacity (q<inf>m</inf>) only increased from 3.36 mg g<sup>-1</sup> to 3.54 mg g<sup>-1</sup> when the temperature was increased from 293 K to 318 K. A two-stage kinetic behavior was observed in the adsorption of uranium (VI): very rapid initial adsorption in a few minutes, followed by a long period of slower uptake. It was found that an increase in temperature resulted in a higher uranium (VI) loading per unit weight of the sorbent. The adsorption of uranium by hematite had good efficiency, and the equilibrium time of adsorbing uranium (VI) was about 6 h. The isothermal data were fitted with both Langmuir and Freundlich equations, but the data fitted the former better than the latter. The pseudo-first-order kinetic model, pseudo-second-order kinetic model and intraparticle diffusion model were used to describe the kinetic data, but the pseudo-second-order kinetic model was the best. The thermodynamic parameter &Delta;G<sup>0</sup> were calculated, the negative &Delta;G<sup>0</sup> values of uranium (VI) at different temperatures confirmed the adsorption processes were spontaneous. &copy;2008 Elsevier Ltd. All rights reserved.

反馈

验证码:
看不清楚,换一个
确定
取消

成果认领

标题:
用户 作者 通讯作者
请选择
请选择
确定
取消

提示

该栏目需要登录且有访问权限才可以访问

如果您有访问权限,请直接 登录访问

如果您没有访问权限,请联系管理员申请开通

管理员联系邮箱:yun@hnwdkj.com