Development of a magnetic core-shell Fe3O4@TA@UiO-66 microsphere for removal of arsenic(III) and antimony(III) from aqueous solution
Development of a magnetic core-shell Fe3O4@TA@UiO-66 microsphere for removal of arsenic(III) and antimony(III) from aqueous solution
复制标题
DOI：
10.1016/j.jhazmat.2019.05.114
复制
发表时间：
2019-10-15
影响因子：
13.6
通讯作者：
Sui, Kunyan
中科院分区：
文献类型：
--
作者：
Qi, Pengfei;Luo, Rong;Sui, Kunyan
由于砷和锑的毒性和移动的特性，从废水中去除三价砷和锑是至关重要的。本研究通过单宁酸（TA）改性磁性Fe 3 O 4，在其周围原位生长UiO-66，制备了一种新型的磁性核壳微球Fe3O4@TA@UiO-66。通过透射电子显微镜（TEM）和X射线衍射（XRD）对微球进行表征，证实UiO-66附着在TA功能化的Fe 3 O 4表面。吸附实验表明，磁性Fe3O4@TA@UiO-66对As（III）和Sb（III）具有很高的吸附容量，处理后2 min内即可从水介质中快速分离。吸附动力学和吸附等温线分别符合准二级动力学模型和Langmuir模型。此外，该复合材料在广泛的溶液化学环境（包括pH值和共存阴离子）中表现出优异的As（III）和Sb（III）去除性能。基于X射线光电子能谱（XPS）和傅里叶变换红外光谱（FTIR）的测量，我们提出去除机理主要是通过表面络合和氢键的协同作用来控制的。本研究表明，磁性微球作为一种有效的材料，用于从水中去除As（III）和Sb（III）的潜力。
Removal of trivalent species of As and Sb from wastewater is crucial due to their more toxic and mobile properties. In this study, a novel magnetic core-shell microsphere Fe3O4@TA@UiO-66 was developed via in-situ crystal growth of UiO-66 around the magnetic Fe3O4 modified by Tannic Acid (TA). Characterization of the microsphere by transmission electron microscopy (TEM) and X-ray diffraction spectroscopy (XRD) confirmed that UiO-66 was adhered on the surface of Fe3O4 functionalized by TA. Adsorption experiments showed that the magnetic Fe3O4@TA@UiO-66 had high adsorption capacity for As(III) and Sb(III) and could be rapidly separated from aqueous media within two minutes after treatment. The adsorption kinetics and adsorption isotherms were described well by the pesudo-second order model and Langmuir model, respectively. In addition, the composite exhibited excellent removal performance for As(III) and Sb(III) in a broad solution chemistry environment, including pH and co-existing anions. Based on X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) measurement, we proposed that the removal mechanism was mainly controlled through a synergistic interaction of surface complexation and hydrogen bonding. This study indicates the potential of the magnetic microsphere to be used as an effective material for the removal of As(III) and Sb(III) from water.