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Membranes 2022, 12, x FOR PEER REVIEW 3 of 13 Membranes 2022, 12, 839 used for the experiment without further purification. The deionized water with a conduc- tivity of less than 5 μS/cm was used as the medium to prepare the salt solutions. 2.2. Preparation of PIMs The PIMs using CTA as the polymer matrix and P507-TBP as extraction carrier were The PIMs using CTA as the polymer matrix and P507-TBP as extraction carrier were synthesized by the casting method according to the procedures in Figure 1. Specifically, synthesized by the casting method according to the procedures in Figure 1. Specifically, 0.2 g 0.2 g of CTA was dissolved into 5 mL of DCM. The TBP and P507 were mixed uniformly of CTA was dissolved into 5 mL of DCM. The TBP and P507 were mixed uniformly with with the volume ratio of 3:1 to prepare the extraction carrier [35]. Then the P507-TBP mix- 3 of 13 2.2. Preparation of PIMs the volume ratio of 3:1 to prepare the extraction carrier [35]. Then the P507-TBP mixture ture was added to the CTA solution, and the homogeneous casting solution was obtained was added to the CTA solution, and the homogeneous casting solution was obtained after after stirring for 1 h. Finally, the casting solution was transferred onto a 5 cm × 5 cm flat stirring for 1 h. Finally, the casting solution was transferred onto a 5 cm × 5 cm flat glass glass and placed at room temperature for 12 h to evaporate the solvent. The resulting and placed at room temperature for 12 h to evaporate the solvent. The resulting membrane membrane was peeled and marked as CTA/P507-TBPX, where X refers to the mass frac- was peeled and marked as CTA/P507-TBPX, where X refers to the mass fraction of P507- tion of P507-TBP in the membrane (X = 20 wt.%, 30 wt.%, 40 wt.%, 50 wt.%, 60 wt.% and TBP in the membrane (X = 20 wt.%, 30 wt.%, 40 wt.%, 50 wt.%, 60 wt.% and 70 wt.%). The 70 wt.%). The composition and thickness of PIMs are listed in Table 1. composition and thickness of PIMs are listed in Table 1. Figure 1. Schematic diagram of preparing CTA/P507-TBP membranes. Figure 1. Schematic diagram of preparing CTA/P507-TBP membranes. Table 1. The compositions and thicknesses of PIMs. Table 1. The compositions and thicknesses of PIMs. Membraneess CTA/P507-TBP2200%% CTA 0.2g P507-TBP((v/v/v: :33/1/1) ) 0.05 Thickness((μμm) ) 72± 3 81 ± 6 81 ± 6 CTA/P507-TBP30% 0.2 g 0.086 CTA/P507-TBP30% 0.2 g 0.086 97 ± 4 97 ± 4 CTA/P507-TBP40% 0.2 g 0.133 CTA/P507-TBP40% 0.2 g 0.133 112 ± 3 112 ± 3 CTA/P507-TBP50% 0.2 g 0.2 CTA/P507-TBP50% 0.2 g 0.2 132 ± 4 CTA/P507-TBP60% 0.2 g 0.3 CTA/P507-TBP60% 0.2 g 0.3 132 ± 4 CTA/P507-TBP70% 0.2 g 0.467 165 ± 3 165 ± 3 CTA/P507-TBP70% 2.3. Characterization of PIMs 2.3. Characterization of PIMs 0.2 g 0.467 The surface and cross-sectional morphologies of CTA/P507-TBP membranes were The surface and cross-sectional morphologies of CTA/P507-TBP membranes were observed by scanning electron microscopy (SEM, Hitachi S4800, Tokyo, Japan), and the observed by scanning electron microscopy (SEM, Hitachi S4800, Tokyo, Japan), and the element distribution of the membrane was investigated by energy dispersive X-ray spec- element distribution of the membrane was investigated by energy dispersive X-ray spec- troscopy (EDX, Tokyo, Japan). Fourier transform infrared spectroscopy (FTIR, Nicolet 6700, −1 Mtroascsoacphyu(sEetDtsX,,ATmoekryioca,)Jawpiathn)t.hFeosucarinenrintrganrasnfogremofin80fr0a–r2e0d00spcemctroswcaospayp(pFlTieIdR,toNsitcuodleyt −1 t6h7e00st,rMucatsusraecohfufsuenttcst,ioAnmalergircoau)pwsiitnhPthIMesc.aTnhneinwgartaenrgcoenotfac8t0a0n–2g0le00ofcmthemweamsabprapnliedsutro- fsatcuedwyathsetesstrteudctbuyreaonfofupntictailocnoanltgarcotuapnsgilnePmIeMasu.Trihnegwanataelryzcoernt(aOcCtaAnHg2le0o0)f.thFievmeedmiffberaenet siuterfsaocfe mweams tbersatnede sbaymapnleopwtiecrael sceolnectatecdt afnogr ltehemmeaesausruinregmaennatlyozfecro(nOtaCcAt Han2g0l0e)s.,Fainvde dthife- afevreernatgseitveasluofemweams dbreatenremsainmedplaeswthereefisnealelcrtesduflto.r the measurement of contact angles, and the average value was determined as the final result. 2.4. Transport Experiments The transport experiments were performed in a two-compartment permeation cell to study the Li+ separation performance of the CTA/P507-TBP membrane. As shown in Figure 2, the feed side was filled with 150 mL of a mixed solution containing 0.1 mol/L ofPDF Image | P507 TBP Carriers for Lithium Extraction from Brines
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