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Novel chlorine resistant low-fouling ultrafiltration membrane based on a hydrophilic polyaniline derivative
Ist Teil von
Journal of materials chemistry. A, Materials for energy and sustainability, 2015-01, Vol.3 (16), p.8725-8733
Erscheinungsjahr
2015
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
We demonstrate that poly(
n
-2-hydroxyethyl aniline) (
n
-PANi), a derivative of polyaniline (PANi), provides an effective chlorine tolerant PANi-based ultrafiltration (UF) membrane.
n
-PANi was synthesized from its monomer
via
chemical oxidative polymerization. Unlike PANi,
n
-PANi can be dissolved in
N
-methyl-2-pyrollidone (NMP) up to 30 wt% to form a casting solution which is stable for months without the aid of an anti-gelling agent. Membranes formed from
n
-PANi show high resistance to chlorine, even when exposed to 250 ppm sodium hypochlorite for 30 days while PANi membranes completely lose their ability to reject bovine serum albumin (BSA, 6 nm) after 2 days. Spectroscopic studies indicate that the benzenoid groups in PANi membranes are oxidized while
n
-PANi membranes maintain their chemical structure.
n
-PANi membranes display high hydrophilicity with a contact angle of ∼36 degrees which contributes to their ultra-low adhesion of
E. coli
. Cross-flow fouling tests with 1.5 g L
−1
BSA fouling solution reveal that
n
-PANi membranes exhibit low-fouling properties with only 11% flux decline and 91% flux recovery, superior to PANi and commercial polysulfone (PSf) membranes.
n
-PANi, an outstanding candidate for making chlorine tolerant antifouling ultrafiltration membranes.