Preparation of Fe 3 O 4 @C@TiO 2 and its application for oxytetracycline hydrochloride adsorption
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Rare Met. DOI 10.1007/s12598-017-0940-7
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Preparation of Fe3O4@C@TiO2 and its application for oxytetracycline hydrochloride adsorption Qi-Li Hu, Lin-Shan Wang* Xiao-Min Hu
, Nan-Nan Yu, Ze-Fei Zhang, Xin Zheng,
Received: 5 August 2016 / Revised: 13 November 2016 / Accepted: 18 June 2017 Ó The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany 2017
Abstract The magnetic Fe3O4@C@TiO2 microspheres with multilevel yolk–shell structure were successfully prepared by combining sol–gel and simple hydrothermal methods. The features of the as-obtained Fe3O4@C@TiO2 microspheres were investigated by Fourier transform infrared (FTIR) spectra, scanning electron microscopy (SEM), powder X-ray diffraction (XRD), N2 adsorption– desorption measurements and transmission electron microscopy (TEM). Fe3O4@C@TiO2 was used as an adsorbent to explore its adsorption properties of oxytetracycline hydrochloride (OTC-HCl) by changing initial concentration and time. The results suggest that the maximum adsorption of Fe3O4@C@TiO2 is 87.3 mgg-1, and the time reaching the absorption equilibrium is 60 min. Langmuir model fits to data better than the Freundlich model, and the kinetic properties are well described by the pseudo-second-order model. In addition, the synthesized composites’ reusability without obvious deterioration in performance is demonstrated by three cycles. Keywords Fe3O4@C@TiO2; Adsorption; Oxytetracycline hydrochloride; Recycle
Q.-L. Hu, L.-S. Wang*, N.-N. Yu, Z.-F. Zhang, X. Zheng College of Science, Northeastern University, Shenyang 110819, China e-mail: [email protected] X.-M. Hu College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
1 Introduction Nowadays, the safety of water gained extensive attention of every country [1]. Antibiotics, as a kind of antibacterial compounds, have aroused particular concern because of their excessive application to human beings, agriculture and planting [2, 3]. As their ineffective metabolism and low absorption of the treated species, a large number of antibiotics are let off through the excretory system [4, 5]. As for it, more and more scientists pay attention to the research of the abuse of antibiotics. Antibiotics are chemical substance produced by microorganism at low temperature; they are often used to cure the infection of human and animals. Besides, people often use antibiotics as growth promoters in animal husbandry and aquaculture industry [6–9]. According to the chemical structure, antibiotics are divided into several species: penicillin, aminoglycoside, tetracycline, chloramphenicol and forests amide. Almost all those species include circles; according to the classification, different structures mean different properties [10]. As the stability of antibiotics and the bacteriostatic action of itself, natural biodegradation process cannot remove from the environment effectively and it can cause accumulation from day to day [8]. At present, many countries have detected the existence of antibiotics
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