Development of highly selective composite polymeric membranes for Li+/Mg2+ separation
نویسندگان
چکیده
To meet the exponentially rising demand for lithium, it becomes vital to develop environmentally friendly processes its recovery from brines, salt lakes and/or seawater. In this work, novel composite lithium transport selective polymeric membranes were developed separate and magnesium ions. Hydrogen manganese oxide (HMO) (at weight percentage 0 25%), polystyrene sulfonate sodium (PSS–Na) triflate (LiCF3SO3) added into sulfonated polyethersulfone (SPES) matrix prepare membranes. The showed high mechanical stability a homogeneous distribution of HMO. most promising membrane, containing 20% (w/w) HMO, an almost 13 times higher Li+ ionic conductivity (8.28 mS/cm) compared control membrane (without HMO) average ideal selectivity 11.75 Li+/Mg2+ pair. composite-20% had lowest intermolecular distance between polymer chains (according X-ray diffraction (XRD) analysis), flexible structure (lowest Tg) dispersion HMO (SEM images), which explains highest among tested ion performance separation efficiency investigated through diffusion dialysis experiments, under different operating conditions. A binary factor 9.10 molar flux 0.026 mol/(m2.h) was achieved without applying any external potential difference. When difference 0.2 V applied, pair 5, while increased 5 times. obtained results provide basis design membranes, thus representing step future implementation such recover saline streams.
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ژورنال
عنوان ژورنال: Journal of Membrane Science
سال: 2021
ISSN: ['1873-3123', '0376-7388']
DOI: https://doi.org/10.1016/j.memsci.2020.118891