Recyclable CNTs/Fe3O4 magnetic nanocomposites as adsorbents to remove bisphenol A from water and their regeneration

被引：186
作者：
Li, Shuzhen [1 ]
Gong, Yibin [1 ]
Yang, Yichang [1 ]
He, Chun [1 ,2 ]
Hu, Lingling [1 ]
Zhu, Linfei [1 ]
Sun, Lianpeng [1 ,2 ]
Shu, Dong [3 ]
机构：
[1] Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangzhou 510275, Guangdong, Peoples R China
[2] Guangdong Prov Key Lab Environm Pollut Control &, Guangzhou 510275, Peoples R China
[3] S China Normal Univ, Sch Chem & Environm, Key Lab Technol Electrochem Energy Storage & Powe, Guangzhou 510006, Peoples R China
来源：
CHEMICAL ENGINEERING JOURNAL | 2015年 / 260卷
基金：
中国国家自然科学基金;
关键词：
CNTs/Fe3O4; nanocomposites; Bisphenol A; Adsorption; Regeneration extent; Recovery extent; MULTIWALLED CARBON NANOTUBES; ZERO-VALENT IRON; ACID ORANGE II; AQUEOUS-SOLUTION; 17-ALPHA-ETHINYL ESTRADIOL; ADSORPTION BEHAVIOR; ORGANIC-CHEMICALS; PH-DEPENDENCE; WASTE-WATER; NANOMATERIALS;
D O I：
10.1016/j.cej.2014.09.032
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
This paper presents the synthesis of magnetic carbon nanotube adsorbents, CNTs/Fe3O4 nanocomposites, in which carbon nanotubes (CNTs) were grafted to magnetic Fe3O4 particles by a facile hydrothermal method. The prepared CNTs/Fe3O4 nanocomposites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), the Brunauer-Emmett-Teller (BET) surface areas, and magnetic property measurements. The adsorption behaviors of the CNTs/Fe3O4 nanocomposites were evaluated for the removal of bisphenol A (BPA) in aqueous solution. It was found that the CNTs/Fe3O4 nanocomposites exhibited strong adsorption behavior for BPA in aqueous solution, and the adsorption of BPA onto the CNTs/Fe3O4 followed the Freundlich adsorption isotherm rather than the Langmuir adsorption isotherm. Moreover, the CNTs/Fe3O4 nanocomposites used, which were separated via an external magnetic field, were independently regenerated by methanol-wash or chemical oxidation methods (Fe2+/H2O2, Na2SO3/Fe2+, or UV/H2O2). The results demonstrated that as a recyclable adsorbent, CNTs/Fe3O4 nanocomposites can maintain a high recovery extent (similar to 98%) via magnetic separation and retain their adsorption behavior within the limits (+/- 1.34) after several adsorption-deactivation-regeneration cycles. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：231 / 239
页数：9
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