吸附
Zeta电位
吸热过程
退火(玻璃)
纳米颗粒
水溶液
材料科学
化学
表面电荷
X射线光电子能谱
化学工程
磁性纳米粒子
核化学
有机化学
纳米技术
复合材料
物理化学
工程类
作者
Guanrong Yang,Qiongzhi Gao,Siyuan Yang,Shiheng Yin,Xin Cai,Xiaoyuan Yu,Shengsen Zhang,Yueping Fang
出处
期刊:Chemosphere
[Elsevier]
日期:2019-09-10
卷期号:239: 124831-124831
被引量:108
标识
DOI:10.1016/j.chemosphere.2019.124831
摘要
The overuse of antibiotics, including tetracycline hydrochloride (TC), seriously threatens human health and ecosystems. In this work, magnetic carbon-coated cobalt oxide nanoparticles (CoO@C) were prepared by one-step annealing method and used as an adsorbent for efficient removal of TC from aqueous solution. The characteristic of the materials was studied by SEM, TEM, and XRD, revealing CoO nanoparticles (≤10 nm) were coated by carbon layer. Several influencial parameters, such as annealing temperature and pH on adsorption of TC, were explored, and found that the maximum adsorption capacity of CoO@C on TC reached as high as 769.43 mg g-1. Furthermore, CoO@C displayed excellent stability and reusability. After four repeated use of the adsorbent, the adsorption capacity still remained at 90% of the initial capacity. The pseudo-second order model and Temkin model proved that it was an exothermic chemical adsorption process. Furthermore, after analysis of FT-IR, Zeta-potential, XPS, the positive charge on the surface of CoO@C forms a strong electrostatic interaction with TC, and in addition, a surface bond is formed between the adsorbent and the TC molecule. This work provides a novel and efficient adsorbent for the purification of TC-containing wastewater.
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