Tailoring fully crosslinked polyamide layers on optimized polyacrylonitrile supports via coactive delayed phase inversion and alkaline hydrolysis for brine treatment through pervaporation
Fareed H. Jang K. Lee W. Kim I.S. Han S.
13 June 2024Elsevier B.V.
Separation and Purification Technology
2024#337
A novel method of co-hydrolysis of polyacrylonitrile (PAN) support to host polyamide (PA) formation using coactive delayed phase inversion is presented to synthesize high-performance pervaporation membranes. Pure water in the coagulation bath was replaced with a 1.0 M sodium hydroxide solution maintained at 50 °C, allowing concurrent hydrolysis and delayed phase inversion. The characterization results revealed a smoother surface morphology, a higher carboxylic group content, improved hydrophilicity, and an ideal O/N ratio (∼1) of the PA layer on the co-hydrolyzed PAN (HPAN-Co) support compared with the PA layer on the post-hydrolyzed PAN (HPAN-Post) support. Furthermore, the typical pattern observed in PA-HPAN-Post, with a plethora of finger-like pores followed by macrovoids, completely disappeared and was replaced by a uniform and fine microvoid structure in PA-HPAN-Co, with an approximately 50 % reduction in membrane thickness. This led to a reduction in membrane swelling and salt transport without compromising the permeation flux. The pervaporation tests with a 10 wt% NaCl feed at 70 °C using PA-HPAN-Co showed a 99.97 % salt rejection ability and a 74.2 kg m−2h−1 flux, which is 33 % higher than the permeate flux of PA-HPAN-Post. Thus, the PA-HPAN-Co membrane is highly recommended for pervaporative desalination, considering the enhanced performance and scalability of the synthesis technique.
Alkaline hydrolysis , Brine , Pervaporation , Polyacrylonitrile , Polyamide
Text of the article Перейти на текст статьи
School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, South Korea
Research Center for Innovative Energy and Carbon Optimized Synthesis for Chemicals, Gwangju Institute of Science and Technology, Gwangju, 61005, South Korea
Global Desalination Research Center, Gwangju Institute of Science and Technology, Gwangju, 61005, South Korea
Department of Civil and Environmental Engineering, National Laboratory Astana, Nazarbayev University, 53 Kabanbay Batyr Ave., Astana, 010000, Kazakhstan
School of Earth Sciences and Environmental Engineering
Research Center for Innovative Energy and Carbon Optimized Synthesis for Chemicals
Global Desalination Research Center
Department of Civil and Environmental Engineering
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026