Performance of rattle-type magnetic mesoporous silica spheres in the adsorption of single and binary antibiotics

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• 作者：Longcheng  ; Xu ; Jiangdong  ; Dai ; Jiangming  ; Pan ; Xiuxiu  ; Li ; Pengwei  ; Huo ; Yongsheng  ; Yan  ; ;   ; ^{xulongcheng123@126.com} ; Xiaobo  ; Zou  ; ;   ; ^{zou_xiaobo@ujs.edu.cn} ; Rongxian  ; Zhang
• 关键词：γ-Fe₂O₃/mSiO₂ spheres ; Tetracycline ; Sulfamethazine ; Adsorption
• 刊名：Chemical Engineering Journal
• 出版年：2011
• 出版时间：15 October 2011
• 年：2011
• 卷：174
• 期：1
• 页码：221-230
• 全文大小：1438 K
• ISSN：S1385894711010618

文摘

The rattle-type γ-Fe₂O₃/mesoporous silica spheres (γ-Fe₂O₃/mSiO₂ spheres) were synthesized with a facial and selectively etching strategy. The prepared particles were characterized by FT-IR, XRD, TEM, SEM, VSM, Raman spectroscopy and nitrogen adsorption–desorption analysis, and the results indicated that γ-Fe₂O₃/mSiO₂ spheres exhibited magnetic property (M_s = 14.43 emu g^?) and composed of mesoporous silica (mean diameter, thickness and pore size was 660 nm, 60 nm, and 2.29 nm, respectively). Then the γ-Fe₂O₃/mSiO₂ spheres were employed as sorbents to remove tetracycline (TC) and sulfamethazine (SMZ) in both single and binary aqueous solutions. The adsorption kinetics of γ-Fe₂O₃/mSiO₂ spheres were well-described by the pseudo-second-order equation, initial adsorption rate, and half-adsorption time. The Langmuir isotherm model was fitted to the equilibrium data better than that for Freundlich model, and the monolayer adsorption capacity of γ-Fe₂O₃/mSiO₂ spheres for TC and SMZ were 0.0791 mmol g^? and 0.0342 mmol g^? at 298 K, respectively. In binary systems, SMZ adsorption onto γ-Fe₂O₃/mSiO₂ spheres was more affected by the simultaneous presence of competitive antibiotics than that for TC. In addition, the reusability of the material without obviously deterioration in performance was observed at least four repealed cycles.