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Frontiers of Chemical Science and Engineering >> 2020, Volume 14, Issue 4 doi: 10.1007/s11705-019-1819-y

Flow synthesis of a novel zirconium-based UiO-66 nanofiltration membrane and its performance in the removal of

State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China

Accepted: 2019-09-23 Available online: 2019-09-23

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Abstract

In this work, a thin zirconium-based UiO-66 membrane was successfully prepared on an alumina hollow fiber tube by flow synthesis, and was used in an attempt to remove -nitrophenol from water through a nanofiltration process. Two main factors, including flow rate and synthesis time, were investigated to optimize the conditions for membrane growth. Under optimal synthesis conditions, a thin UiO-66 membrane of approximately 2 µm in thickness was fabricated at a flow rate of 4 mL·h for 30 h. The -nitrophenol rejection rate for the as-prepared UiO-66 membrane applied in the removal of -nitrophenol from water was only 78.1% due to the existence of membrane defects caused by coordinative defects during membrane formation. Post-synthetic modification of the UiO-66 membrane was carried out using organic linkers with the same flow approach to further improve the nanofiltration performance. The result showed that the -nitrophenol rejection for the post-modified membrane was greatly improved and reached over 95%. Moreover, the post-modified UiO-66 membrane exhibited remarkable long-term operational stability, which is vital for practical application.

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