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Title: Development of high performance nanofibrous composite membranes by optimizing polydimethylsiloxane architectures for phenol transport
Authors: Jin, Meng-Yi
Liao, Yuan
Tan, Choon-Hong
Wang, Rong
Keywords: Engineering::Civil engineering
Phenol Extraction
Issue Date: 2017
Source: Jin, M.-Y., Liao, Y., Tan, C.-H., & Wang, R. (2018). Development of high performance nanofibrous composite membranes by optimizing polydimethylsiloxane architectures for phenol transport. Journal of Membrane Science, 549, 638-648. doi:10.1016/j.memsci.2017.10.051
Series/Report no.: Journal of Membrane Science
Abstract: Phenol removal and recovery from wastewaters are highly demanded in industries due to its high toxicity and industrial importance. It can transport through the silicon-based rubber polydimethylsiloxane (PDMS) via the solution-diffusion mechanism. To improve the phenol removal efficiency in extractive processes, dense PDMS membranes with different macromolecular structures have been developed and evaluated in this work. The condensation-cured PDMS membranes (PA) with network architecture exhibited higher phenol partition coefficients (K) than the hydrosilylation-cured PDMS membranes with linear and branch architectures. This was attributed to the four-armed quaternary-siloxy linkages formed in the three-dimensional network structure, increasing the free volume for phenol passage and hydrogen bonding between phenol and PDMS matrix. The K of PA was further enhanced by optimizing the PDMS precursor chain length and cross-linker amount, and the corresponding membrane mechanical properties and phenol overall mass transfer coefficients (k0) were examined. The optimal PA formulation was utilized to fabricate a highly effective nanofibrous composite membrane via spray coating. The resultant composite membrane exhibited a k0 of 18.3 ± 1.3 × 10−7 m/s in an aqueous-aqueous extractive process, significantly outperforming the commercial counterpart with 45% increment. This is the first demonstration of the importance of PDMS macromolecular structures on phenol extraction. The newly-developed condensation-cured PDMS could contribute to the fabrication of highly effective composite membranes for various extractive processes.
ISSN: 0376-7388
DOI: 10.1016/j.memsci.2017.10.051
Rights: © 2017 Elsevier B.V. All rights reserved. This paper was published in Journal of Membrane Science and is made available with permission of Elsevier B.V.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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