Removal of uranium from aqueous solution by a low cost and high-efficient adsorbent
Removal of uranium from aqueous solution by a low cost and high-efficient adsorbent
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低成本高效吸附剂从水溶液中去除铀
DOI：
10.1016/j.apsusc.2013.01.182
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发表时间：
2013-05-15
影响因子：
6.7
通讯作者：
Hua, Rong
中科院分区：
文献类型：
--
作者：
Liu, Yun-Hai;Wang, You-Qun;Hua, Rong
在本研究中，与原始水热碳（HTC）相比，开发了一种低成本、高效的含羧基碳质吸附剂（HTC- cooh）。采用扫描电镜（SEM）、N-2吸附-解吸、傅里叶变换-红外光谱（FT-IR）和酸碱滴定法对所得吸附剂的结构和化学性质进行了表征。通过批量实验研究了影响吸附剂吸附U（VI）的关键因素（溶液pH、接触时间、初始浓度和温度）。U（VI）在HTC和HTC- cooh上的吸附与ph有关，随温度和初始离子浓度的增加而增加。通过Langmuir等温方程确定了U（VI）在吸附剂上的吸附平衡，发现HTC-COOH的单层吸附量为205.8 mg/g。吸附动力学完全符合准二级速率模型。根据吸附热力学，U（VI）在HTC和HTC- cooh上的吸附过程是吸热自发的。此外，HTC-COOH在含有共存离子（Mg2+、Co2+、Ni2+、Zn2+和Mn2+）的水溶液中可以选择性吸附U（VI）。从实验结果来看，HTC-COOH是一种有潜力的吸附剂，可以有效去除污染水中的U（VI）。(C) 2013 Elsevier b.v.版权所有
In this study, a low-cost and high-efficient carbonaceous adsorbent (HTC-COOH) with carboxylic groups was developed for U(VI) removal from aqueous solution compared with the pristine hydrothermal carbon (HTC). The structure and chemical properties of resultant adsorbents were characterized by Scanning electron microscope (SEM), N-2 adsorption-desorption, Fourier transform-infrared spectra (FT-IR) and acid-base titration. The key factors (solution pH, contact time, initial U(VI) concentrations and temperature) affected the adsorption of U(VI) on adsorbents were investigated using batch experiments. The adsorption of U(VI) on HTC and HTC-COOH was pH-dependent, and increased with temperature and initial ion concentration. The adsorption equilibrium of U(VI) on adsorbents was well defined by the Langmuir isothermal equation, and the monolayer adsorption capacity of HTC-COOH was found to be 205.8 mg/g. The kinetics of adsorption was very in accordance with the pseudo-second-order rate model. The adsorption processes of U(VI) on HTC and HTC-COOH were endothermic and spontaneous in nature according to the thermodynamics of adsorption. Furthermore, HTC-COOH could selectively adsorption of U(VI) in aqueous solution containing co-existing ions (Mg2+, Co2+, Ni2+, Zn2+ and Mn2+). From the results of the experiments, it is found that the HTC-COOH is a potential adsorbent for effective removal of U(VI) from polluted water. (C) 2013 Elsevier B. V. All rights reserved.