Influence of Sodium Hypochlorite Treatment on Pore Size Distribution of Polysulfone/Polyvinylpyrrolidone Membranes

Membranes

Evgenia Grushevenko¹  Alexey Yushkin¹  Alexey Volkov¹  Vladislav Sudin²  George Kagramanov³  George Dibrov³ 

[1] A.V. Topchiev Institute of Petrochemical Synthesis RAS, Russian Academy of Sciences, 119991 Moscow, Russia;Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, 119334 Moscow, Russia;D.Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia;

关键词: polysulfone;    polyvinylpyrrolidone;    membrane;    ultrafiltration;    porosimetry;    sodium hypochlorite;   

DOI  :  10.3390/membranes10110356

来源: DOAJ

【 摘 要 】

This work was focused on the study of hypochlorite treatment on the pore size distribution of membranes. To this end, ultrafiltration membranes from a polysulfone/polyvinylpyrrolidone blend with a sponge-like structure were fabricated and exposed to hypochlorite solutions with different active chlorine concentrations for 4 h at ambient temperature. Liquid–liquid displacement and scanning electron microscopy were employed to study the limiting and surface pores, respectively. After treatment with 50 ppm hypochlorite solution at pH = 7.2, a five-fold increase in water permeance up to 1400 L/(m²·h·bar) was observed, accompanied by a 40% increase in the limiting pore sizes and almost a three-fold increase in the porosity. After 5000 ppm treatment at pH = 11.5, a 40% rise in the maximum limiting pore size and almost a two-fold increase in the porosity and permeance was observed, whereas the mean pore size was constant. Apparently, changes in the membrane structure at pH = 11.5 were connected with polyvinylpyrrolidone (PVP) degradation and wash-out, whereas at lower pH and despite lower active chlorine concentration, this process was coupled with polysulfone (PSf) destruction and removal.

【 授权许可】

Unknown