Understanding the high adsorption-reduction performance of triethanolamine modified graphene oxide for silver ions
Understanding the high adsorption-reduction performance of triethanolamine modified graphene oxide for silver ions
复制标题
了解三乙醇胺改性氧化石墨烯对银离子的高吸附还原性能
DOI：
10.1016/j.colsurfa.2019.01.031
复制
发表时间：
2019-04
期刊：
影响因子：
--
通讯作者：
Zhou Yonghua
中科院分区：
文献类型：
--
作者：
Liu Youcai;Gao Menghuan;Zheng Long;Zhao Jun;Wang Hui;Han Kai;Zhou Yonghua
氧化石墨烯（GO）及其衍生物在去除水溶液中金属离子方面的研究引起了人们的广泛关注。研究了三乙醇胺（TEOA）改性GO对银离子（Ag+）的吸附还原性能及机理。傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）表征表明，TEOA分子通过化学作用和静电作用两种方式牢固地锚定在GO表面。结果表明，GO对Ag+的初始吸附量主要是静电作用导致的，而化学作用导致的吸附量随着Ag+浓度的增加而不断增加。理论计算、XPS和TEM表征进一步揭示了TEOA与吡啶N之间的化学作用产生了强还原性的吡啶N物种，从而使Ag+被吸附还原为Ag金属，并进一步聚集成更大的颗粒。综合仪器表征、吸附性能和理论计算结果，我们认为化学键合TEOA对Ag+的吸附是通过吸附-还原-聚集-再生循环实现的。本文的研究结果为探讨TEOA改性GO对Ag+的吸附机理提供了新的思路，为回收和去除水溶液中的金属离子提供了一种有效的方法。
Graphene oxide (GO) and its derivatives have attracted much attention for metal ions removal in aqueous solution. Here, the adsorption-reduction performance and mechanism of triethanolamine (TEOA) modified GO towards silver ions (Ag+) were investigated. Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) characterizations indicated that TEOA molecules were tightly anchored on GO surface through two types of interactions including chemical interaction and electrostatic interaction. The adsorption performance results showed that the electrostatic interaction TEOA on GO contributed to a high initial adsorption capacity towards Ag+, while chemical interaction TEOA on GO led to a constant rising of the adsorption capacity with increase of Ag+concentration. Theoretical calculation, XPS and transmission electron microscopy (TEM) characterization further revealed the chemical interaction TEOA produced pyridine N species which exhibited strong reducibility, so that Ag+was adsorbed and reduced to Ag metal thereon, and further aggregated into larger particles. Integrating the results of instrument characterizations, adsorption performance, and theoretical calculation, we proposed that the adsorption-reduction-aggregation-regeneration circulation led to the constant rising of adsorption capacity of Ag+on GO with chemical-bonded TEOA. The conclusions in this paper provide us a new insight into the adsorption mechanism of Ag+on TEOA modified GO and rendered an efficient alternative for the recovery and removal of metal ions in aqueous solution.
登录
查看更多内容
影响因子：
11.1
作者：
S. Sawant;R. Pawar;Seung-Mok Lee;M. Cho
通讯作者：
S. Sawant;R. Pawar;Seung-Mok Lee;M. Cho
负载Ag纳米颗粒的新型聚合物g-C3N4增强可见光催化活性
影响因子：
5.5
作者：
Ge, Lei;Han, Changcun;Li, Yunfeng
通讯作者：
Li, Yunfeng
影响因子：
7.2
作者：
G. Koh;Yong-Wei Zhang;H. Pan
通讯作者：
G. Koh;Yong-Wei Zhang;H. Pan
模仿原始发光细菌：基于具有自矿化反应中心的肽-卟啉共组装体的可持续析氢
影响因子：
16.6
作者：
Liu, Kai;Xing, Ruirui;Yan, Xuehai
通讯作者：
Yan, Xuehai
通过氮烯化学功能化单独分散、高度可溶且导电的石墨烯纳米片的一般方法
影响因子：
8.6
作者：
He, Hongkun;Gao, Chao
通讯作者：
Gao, Chao