Membrane fouling remains a key challenge
for membrane
separations.
Hydrophilic membrane surface modification can mitigate irreversible
foulant deposition, thereby improving fouling resistance. We report
new hydrophilic membrane coatings based on 1,4-benzoquinone and various
commercially available polyetheramines. These coatings, prepared from
1,4-benzoquinone and Jeffamine EDR 148, poly(benzoquinone-Jeffamine
EDR 148) (p(BQ-EDR 148)), were used to modify polysulfone (PS) ultrafiltration
membranes. In fouling experiments using an oil/water emulsion, membranes
exhibited comparable fouling resistance to that of polydopamine (pDA)-modified
membranes. Based on contact angle measurements, p(BQ-EDR 148) and
pDA-modified membranes have similar levels of hydrophilicity, and
both exhibited higher threshold flux values than those of their unmodified
analogues. Based on their similar threshold flux values, p(BQ-EDR
148)-modified (76 LMH) and pDA-modified membranes (74 LMH) should
have similar fouling resistance. Moreover, the mean pore size of p(BQ-EDR
148)-modified membranes can be tuned, while keeping the pure water
permeance constant, by changing the deposition time and molar ratio
of benzoquinone to EDR 148 in the modification solution.