NDLI: Efficient removal of Congo red by magnetically separable mesoporous TiO$_{2}$ modified with γ-Fe$_{2}$O$

Content Provider	Springer Nature Link
Author	Yu, M. Zhao, S. Wu, H. Asuha, S.
Copyright Year	2013
Abstract	Magnetically separable mesoporous TiO$_{2}$ modified with γ-Fe$_{2}$O$_{3}$ was prepared and characterized by X–ray diffraction, N$_{2}$ adsorption–desorption measurements, scanning electron microscopy, UV–vis absorption and magnetic measurements. The adsorptive removal of Congo red using the binary system was performed under various experimental conditions to examine the effects of contact time, solution pH, and initial concentration of Congo red. The results show that the removal abilities and separability of mesoporous TiO$_{2}$ adsorbent for Congo red can be significantly improved by modification with γ-Fe$_{2}$O$_{3}$. The adsorption of Congo red on the γ-Fe$_{2}$O$_{3}$–TiO$_{2}$ reaches the maximum percentage removal of ca. 97 % within 60 min, showing that most of Congo red can be removed in a short time. When the pH of solution is varied from 3.4 to 10.3, the percentage removal of Congo red decreases from ca. 97 to ca. 15 %, showing that the adsorption is strongly dependent on solution pH. The adsorption kinetics of Congo red fit well with pseudo-second-order kinetic model, and the equilibrium data is best described by Langmuir adsorption model. The maximum adsorption capacity of the γ-Fe$_{2}$O$_{3}$–TiO$_{2}$ for Congo red is estimated to be 125.0 mg/g.
Starting Page	1353
Ending Page	1360
Page Count	8
File Format	PDF
ISSN	13802224
Journal	Journal of Porous Materials
Volume Number	20
Issue Number	5
e-ISSN	15734854
Language	English
Publisher	Springer US
Publisher Date	2013-05-28
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mesoporous titania Maghemite Congo red Adsorption Water treatment Catalysis Characterization and Evaluation of Materials Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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