Citation: Qing-yun Wu, Hong-qing Liang, Meng Li, Bo-tong Liu, Zhi-kang Xu. Hierarchically Porous Carbon Membranes Derived from PAN and Their Selective Adsorption of Organic Dyes[J]. Chinese Journal of Polymer Science, ;2016, 34(1): 23-33. doi: 10.1007/s10118-016-1723-6 shu

Hierarchically Porous Carbon Membranes Derived from PAN and Their Selective Adsorption of Organic Dyes

1.
Department of Polymer Science and Engineering, Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
2.
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China

Received Date: 16 June 2015
Revised Date: 22 July 2015

Fund Project: This work was financially supported by the National Natural Science Foundation of China (No. 21174124) and K.C. Wong Magna Fund in Ningbo University.

Porous carbon membranes were favorably fabricated through the pyrolysis of polyacrylonitrile (PAN) precursors, which were prepared with a template-free technique-thermally induced phase separation. These carbon membranes possess hierarchical pores, including cellular macropores across the whole membranes and much small pores in the matrix as well as on the pore walls. Nitrogen adsorption indicates micropores (1.47 and 1.84 nm) and mesopores (2.21 nm) exist inside the carbon membranes, resulting in their specific surface area as large as 1062 m2/g. The carbon membranes were used to adsorb organic dyes (methyl orange, Congo red, and rhodamine B) from aqueous solutions based on their advantages of hierarchical pore structures and large specific surface area. It is particularly noteworthy that the membranes present a selective adsorption towards methyl orange, whose molecular size (1.2 nm) is smaller than those of Congo red (2.3 nm) and rhodamine B (1.8 nm). This attractive result can be attributed to the steric structure matching between the molecular size and the pore size, rather than electrostatic attraction. Furthermore, the used carbon membranes can be easily regenerated by hydrochloric acid, and their recovery adsorption ratio maintains above 90% even in the third cycle. This work may provide a new route for carbon-based adsorbents with hierarchical pores via a template-free approach, which could be promisingly applied to selectively remove dye contaminants in aqueous effluents.
- Carbon membranes,
- Polyacrylonitrile,
- Thermally induced phase separation,
- Methyl orange,
- Selective adsorption
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