膜科学与技术

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year,volume(issue):pagination： 2020,40(1):53-63

Abstract：

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Funds：

国家自然科学基金（No.21736001和No.21576024）资助

AuthorIntro：

第一作者简介：路姣姣（1992-），女，河北邯郸人，硕士研究生，主要从事渗透汽化膜分离研究。 *通讯作者，E-mail：zhaozp@bit.edu.cn

Reference：

Halloysite nanotubes (HNTs), as one of the naturally tubular materials, have great potential in the field of membrane separations, due to the unique one-dimensional lumen tube with open-pore endings. In this study, a series of mixed matrix membranes (MMMs) were prepared by incorporating HNTs into polydimethylsiloxane (PDMS) matrix through physical blending for pervaporation separation of acetone-butanol-ethanol (ABE) from aqueous solution. Chemical composition and microstructures of the membranes were characterized in detail. The effects of HNTs loading, feed temperature, and testing time on the pervaporation performance of the resultant membrane were investigated. The results revealed that the HNTs had good compatibility with PDMS matrix, and the HNTs were uniformly dispersed in PDMS matrix. The addition of HNTs increased the water contact angle of the membrane from 110o to 131o, while the surface free energy was reduced significantly. As a result, the selectivity of the membrane about ABE from aqueous solution was enhanced. Meanwhile, the high permeability of the resultant membrane was achieved arising from the one-dimensional open-pore lumen (diameter, 15-25 nm) of HNTs, which constructed a fast diffusion channel with low transfer resistance for penetrants. The total permeation flux of the resultant membrane reached about 1368 g m-2 h-1 in separation model ABE solution at 55 °C, and the separation factor of n-butanol was 38.2. Notably, the resultant membrane had good long-term stability and selectivity during the 100 h continuous operation for ABE recovery from aqueous solution.

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