TY - JOUR
T1 - Hydrolytic stability of PEG-grafted γ-alumina membranes
T2 - Alkoxysilane vs phosphonic acid linking groups
AU - Kyriakou, Nikos
AU - Pizzoccaro, Marie-Alix
AU - Nijmeijer, Arian
AU - Luiten-Olieman, Mieke
AU - Winnubst, Louis
PY - 2020/11
Y1 - 2020/11
N2 - Small polyethylene glycol (PEG) molecules were grafted on ceramic γ-alumina membranes, by making use of organo-alkoxysilanes or organo-phosphonic acids as linking groups. It was proven by FTIR that the short PEG brushes are chemically grafted into the pores of a 5 nm γ-alumina mesoporous support, which results in a decrease of the pore diameter as measured by cyclohexane permporometry (reduction of 2.1 nm). The stability of these PEG-grafted membranes was investigated in water for 216 h. Permeability and liquid state 1H NMR were used to show that PEG-modified membranes with an alkoxysilane linking group degrade rapidly during exposure to water. On the contrary, the phosphonic acid linking group remained grafted on γ-alumina supports for at least 216 h in water. In conclusion, this work shows a promising and simple method for the fabrication in a green solvent (water) of hydrophilic organically-modified ceramic membranes, which can be successfully applied for wastewater treatment.
AB - Small polyethylene glycol (PEG) molecules were grafted on ceramic γ-alumina membranes, by making use of organo-alkoxysilanes or organo-phosphonic acids as linking groups. It was proven by FTIR that the short PEG brushes are chemically grafted into the pores of a 5 nm γ-alumina mesoporous support, which results in a decrease of the pore diameter as measured by cyclohexane permporometry (reduction of 2.1 nm). The stability of these PEG-grafted membranes was investigated in water for 216 h. Permeability and liquid state 1H NMR were used to show that PEG-modified membranes with an alkoxysilane linking group degrade rapidly during exposure to water. On the contrary, the phosphonic acid linking group remained grafted on γ-alumina supports for at least 216 h in water. In conclusion, this work shows a promising and simple method for the fabrication in a green solvent (water) of hydrophilic organically-modified ceramic membranes, which can be successfully applied for wastewater treatment.
KW - Alkoxysilane
KW - Aqueous stability
KW - Gamma alumina
KW - Grafting
KW - Nanofiltration membrane
KW - Phosphonic acid
U2 - 10.1016/j.micromeso.2020.110516
DO - 10.1016/j.micromeso.2020.110516
M3 - Article
SN - 1387-1811
VL - 307
JO - Microporous and mesoporous materials
JF - Microporous and mesoporous materials
M1 - 110516
ER -
