TY - JOUR
T1 - Effect of fatty acids on the structure and performance of cellulose acetate nanofiltration membranes in retention of nitroaromatic pesticides
AU - Ghaemi, Negin
AU - Alizadeh, A.
AU - Rajabi, H.
AU - Daraei, P.
AU - Falsafi, M.
A2 - Madaeni, S.S.
PY - 2012/9/3
Y1 - 2012/9/3
N2 - Effects of addition of amphiphilic fatty acids (palmitic, oleic, and linoleic acids) were investigated on morphology and performance of cellulose acetate (CA) nanofiltration membranes. Water contact angle and zeta potential measurements, FTIR-ATR, SEM, AFM, and mechanical tests were applied to characterize the membranes. Performance of the membranes was examined in retention of a series of nitroaromatic pesticides (i.e. nitrophenols as one of the most important pollutants). p-Nitrophenol (PNP), 2,4-dinitrophenol (DNP), 3,5-dinitrosalicylic acid (DNSA), 2-methyl-4,6-dinitrophenol (DNOC), and 4-nitrophenyl phosphate disodium salt hexahydrate (NPP) were selected with different acidity and hydrophobicity as nitroaromatic pesticides. The treated membranes revealed considerably higher pure water flux and permeation compared to CA membrane. Performance of separation was strongly influenced by kind of nitrophenols and solution pH. Rejection of NPP, DNSA, DNP, and DNOC increased by increasing of the solution pH and additives concentration. However, rejection of PNP molecules increased by increment of concentration of additives similar to other nitrophenols, PNP molecules revealed different behavior by alteration in the solution pH. Comparison in efficiency showed that modified membranes upon addition of palmitic acid represent higher rejection of nitrophenols. Performance of the membranes was compared with commercial NF45 membrane proving the superior efficiency of CA modified membranes.
AB - Effects of addition of amphiphilic fatty acids (palmitic, oleic, and linoleic acids) were investigated on morphology and performance of cellulose acetate (CA) nanofiltration membranes. Water contact angle and zeta potential measurements, FTIR-ATR, SEM, AFM, and mechanical tests were applied to characterize the membranes. Performance of the membranes was examined in retention of a series of nitroaromatic pesticides (i.e. nitrophenols as one of the most important pollutants). p-Nitrophenol (PNP), 2,4-dinitrophenol (DNP), 3,5-dinitrosalicylic acid (DNSA), 2-methyl-4,6-dinitrophenol (DNOC), and 4-nitrophenyl phosphate disodium salt hexahydrate (NPP) were selected with different acidity and hydrophobicity as nitroaromatic pesticides. The treated membranes revealed considerably higher pure water flux and permeation compared to CA membrane. Performance of separation was strongly influenced by kind of nitrophenols and solution pH. Rejection of NPP, DNSA, DNP, and DNOC increased by increasing of the solution pH and additives concentration. However, rejection of PNP molecules increased by increment of concentration of additives similar to other nitrophenols, PNP molecules revealed different behavior by alteration in the solution pH. Comparison in efficiency showed that modified membranes upon addition of palmitic acid represent higher rejection of nitrophenols. Performance of the membranes was compared with commercial NF45 membrane proving the superior efficiency of CA modified membranes.
KW - Nanofiltration
KW - Cellulose acetate
KW - Fatty acid
KW - Nitroaromatic
KW - Pesticide
U2 - 10.1016/j.desal.2012.06.008
DO - 10.1016/j.desal.2012.06.008
M3 - Article
SN - 0011-9164
VL - 301
SP - 26
EP - 41
JO - Desalination
JF - Desalination
ER -