Hyperbranched polyethylenimine-modified polyethersulfone (HPEI/PES) and nAg@HPEI/PES membranes with enhanced ultrafiltration, antibacterial, and antifouling properties

Abstract

New flat sheet membranes possessing both organic antifouling and antibacterial properties were fabricated. The successive modification of PES with HPEI and nAg resulted in enhanced membrane properties. Most of the membranes exhibited good antibacterial activities against the bacterial strains tested. Membrane samples with nAg also displayed good antibacterial activities against bacteria E Coli. The use of cost friendly HPEI and low levels of modification, and ease of membrane fabrication was achieved.

Fabrication of a polyethersulfone/polyethyleneimine porous membrane for sustainable separation of proteins in water media

“…41) from the zeta potential value. The membrane positive surface charge increased from 8.4 mV to 16.4 mV at pH 6.5 with the increase of PEI amount, 21,42 as shown in Fig. 5.…”

“…The membrane surface is characterized as rough if the values are large and smooth if the values are minimal. This phenomenon might be attributed to a certain amount of PEI that can be generated by the 16.4 mV at pH 6.5 with the increase of PEI amount, 21,42 as shown in Fig. 5.…”

“…Studies conducted in the past have shown that the addition of PEI might enhance the filtering performance of PES membranes even in the presence of inorganic substances. [21][22][23][24] For instance, Fang et al 25 developed a PEImodified PES membrane and discovered that it had a greater thickness, 35 times higher permeability, and a rejection rate of around 99% for proteins. Marques et al 26 manufactured a PEI-deposited PES ultrafiltration membrane which demonstrated a better degree of hydrophilicity in addition to a 400% increase in the permeate flow of protein solution in comparison to the control membrane.…”

Synergistic effect of GO/ZnO loading on the performance of cellulose acetate/chitosan blended reverse osmosis membranes for NOM rejection

“…In fact, the optimum interaction between GO and ZnO to control the hydrophilicity of membranes was exhibited in GO5. Moreover, the decrease in concentration of ZnO from GO1 to GO5 may reduce interionic crosslinks in the polymer matrix, again supporting the hydrophilic nature of membranes [ 45 ].

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“…However, introduction of graphene oxide in GO2 and onwards, reduced the angle almost in a regular way. Lesser is angle, more hydrophilic is the membrane [ 45 ]. As the amount of GO increased and that of ZnO decreased, a great diversity was introduced in the morphology of membranes, which results in decline in contact angle from 63° to 36 ° .…”