TITLE:
Surface Modification of PEEK-WC Membranes by Wet Phase Inversion for Ni(II) Adsorption
AUTHORS:
Said Bey, Mohamed Benamor, Enrico Drioli
KEYWORDS:
DEHPA; Phase Inversion; PEEK-WC; Ni(II); SLM
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.4 No.7A,
July
3,
2013
ABSTRACT:
This work focuses on the
preparation and characterization of flat sheet membrane based on modified
polyether ether keetone (PEEK-WC). Additives, such as dibutyl phatalate (DBP)
and diethyl hexyl phosphoric acid (DEHPA), were used to investigate their
effect on membranes properties which are prepared by immersion precipitation.
For that, several techniques were used to characterize membranes like thermal
analyses, scanning electron microscopy and microanalyses. SEM pictures show
versatile structures of the membranes from dense to porous membranes
characterized by a sponge and finger like structure. Moreover, microanalyses of
both surfaces, bottom and top surfaces show an aggregation of DEHPA at the top
surface of the membrane. However, by adding dibutylphtalate, a well dispersion
of the extractant was observed. Initially, micro-porous membranes were used in
supported liquid membranes experiments for Ni(II) metal ions transports using
diethyl hexyl phosphoric acid (DEHPA) as carrier. The extraction efficiency was
very low about 28%, but enhanced by adding
xylene to the organic phase. However, the modified membranes (with additives) by
DBP and DEHPA were used on solid liquid extraction of Ni(II). The results show
that by adding the plasticizer and the extractant, the efficiency of the system
reached 63%.