期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 333, 期 -, 页码 222-231出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2017.03.014
关键词
Dual-porosity; Mesopores; Macropores; Mn2O3; Dye adsorption
资金
- National Natural Science Foundation of China [51272296]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
- Chongqing University
- Chongqing Graduate Student Research Innovation Project [CYB15046]
Dual-porosity materials containing both macropores and mesopores are highly desired in many fields. In this work, we prepared dual-porosity Mn2O3 cube materials with large-pore mesopores, in which, macropores are made by using carbon spheres as the hard templates, while the mesopores are produced via a template-free route. The attained dual-porosity Mn2O3 materials have 24 nm of large-pore mesopores and 700 nm of macropores. Besides, the achieved materials own cubic morphologies with particle sizes as large as 6.0 mu m, making them separable in the solution by a facile natural sedimentation. Dye adsorption measurements reveal that the dual-porosity materials possess a very high maximum adsorption capacity of 125.6 mg/g, much larger than many reported materials. Particularly, the adsorbents can be recycled and the dye removal efficiency can be well maintained at 98% after four cycles. Adsorption isotherm and kinetics show that the Langmuir model and the pseudo-second-order kinetics model can well describe the adsorption process of Congo Red on the dual-porosity Mn2O3 cube materials. In brief, the reported dual-porosity Mn2O3 demonstrates a good example for controlled preparation of dual-porosity materials with large-pore mesopores, and the macropore-mesopore dual-porosity distribution is good for mass transfer in dye adsorption application. (C) 2017 Elsevier B.V. All rights reserved.
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