NDLI: The effect of polymer concentration on electrospun PVDF membranes for desalination by direct contact membrane distillation

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The effect of polymer concentration on electrospun PVDF membranes for desalination by direct contact membrane distillation

Content Provider	Semantic Scholar
Author	Armand, Seyed Borhan Fouladitajar, Amir Ashtiani, Farzin Zokaee Karimi, Mohammad
Copyright Year	2017
Abstract	Membrane separation technology holds great potential in advancing desalination and water/wastewater treatment to improve the efficiency of impurities removal as well as to augment water supply. Various membrane based technologies are currently being applied for these purposes. Among the current membrane-based technologies, the MD process presents many attractive features compared to others. MD is a low pressure, non-isothermal membrane separation process with a hydrophobic microporous membrane which offers a solution for the treatment of concentrated solutions that are not viable for reverse osmosis. An increasing array of research is being conducted to fabricate novel membranes in order to optimize the performance of the MD process. Different parameters such as pore size, porosity and thickness affect membrane performance during the MD process. Electrospining method for fabrication of membranes allows for controlling of mentioned properties. In this study, by taking into consideration that the polymer concentration has the significant effect on the resultant nanofiber diameter and electrospun nanofibrous membrane (ENM) structure, different Polyvinylidene fluoride (PVDF) membranes with different fiber diameters and physical properties were obtained by varying polymer concentration from 20 to 24.5 wt%. Fabricated membranes were tested for desalination by direct contact membrane distillation (DCMD). The bead-free nanofiber with diameter of 240 nm obtained at 20 wt% concentration of polymer solution and increasing PVDF concentration lead to an increase of fiber diameter to 464 nm. Results of DCMD operation show that by increasing concentration of polymer solution, the permeate flux decreases. For all membranes the salt rejection ratio was more than 99.9%.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.ewra.net/ew/pdf/EW_2017_58_04.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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