4.5 Article

Improved Desalination Performance of Polyvinylidene Fluoride Hollow Fiber Membranes by the Intermediate Role of Surfactants

期刊

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.202000538

关键词

direct contact membrane distillation; hollow fiber membranes; nonsolvent‐ induced phase separation; surface activity

资金

  1. National Natural Science Foundation of China [21776216]
  2. National Key Research and Development Program of China [2017YFC0403902]
  3. Natural Science Foundation of Shandong Province [ZR2019LFG007]
  4. Program for Innovative Research Team in University of Tianjin [TD13-5044]
  5. Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT) of Ministry of Education of China [IRT13084]
  6. Tianjin Key Laboratory Project, Tianjin, China

向作者/读者索取更多资源

Increasing the surfactant surface activity has been found to improve the water flux of polymer hollow fiber membranes significantly, leading to a great increase in the efficiency of ultrafiltration and direct contact membrane distillation. This method, different from conventional approaches, enhances the surface porosity and optimizes pore size distribution without compromising membrane mechanical strength.
Polymer hollow fiber membranes (HFMs) are the core or base membranes of various membrane processes (e.g., ultrafiltration and membrane distillation). Preparing polymer HFMs with higher water flux helps improve the efficiency of the membrane processes. Using pore-forming additives is the commonly used and efficient method to improve the water flux. The current dilemma is that the conventional methods that increase the amounts or the molecular weight of the additives to improve the water flux usually lead to the decrease in membrane mechanical strength. Herein, different from the conventional research strategy, increasing the surfactant surface activity (SA) is first found to deeply promote the core of nonsolvent-induced phase separation (NIPS) that of the mutual diffusion between water and dopes. As a result, this method distinctly improves the surface porosity (from 0.8% to 9.7%) and optimizes the pore size distribution of polyvinylidene fluoride (PVDF) HFMs. Benefit from these, the water flux of ultrafiltration (3.1-fold increase, maximally) and direct contact membrane distillation (2.3-fold increase, maximally) are increased greatly. Moreover, the mechanical strength is not negatively affected due to the additive amount of small molecule surfactants is constant and small (2.0 wt%).

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