Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (4): 846.doi: 10.7503/cjcu20190537
• Material Chemistry • Previous Articles
REN Wen,ZHANG Guoli,YAN Han,HU Xinghua,LI Kun,WANG Jingfeng,LI Ruiqi(
)
Received:2019-10-17
Online:2020-04-10
Published:2020-02-17
Contact:
Ruiqi LI
E-mail:liruiqi@hrbeu.edu.cn
Supported by:CLC Number:
TrendMD:
REN Wen, ZHANG Guoli, YAN Han, HU Xinghua, LI Kun, WANG Jingfeng, LI Ruiqi. Preparation of Superhydrophobic Polyaniline/Polytetrafluoroethylenethylene Composite Membrane and Its Separation Ability for Oil-Water Emulsion †[J]. Chem. J. Chinese Universities, 2020, 41(4): 846.
Fig.1 SEM images of PTFE membrane(A) and PANI/PTFE composite membrane(B)Insets: (A) photo of PTFE membnane; (B) magnified image of the area framed in (B).
Fig.2 SEM images of PANI/PTFE composite membrane with different aniline concentrationsConcentration of ANI(mol/L): (A) 0.1; (B) 0.15; (C,D) 0.2. Reaction time/h: (A—C) 6; (D) 24. Insets in the upright of (A—D): the contact angles of water droplets on PANI/PTFE composite membrane. Inset in the downright of (D): high-resolution SEM images of PANI nanofibers.
Fig.3 Infrared spectra of PTFE(a)and PANI/PTFE composite membrane(b)
Fig.4 UV-Vis spectra of PTFE(a) and PANI/PTFE composite membrane(b)
Fig.5 The wettability of PTFE membrane and PANI/PTFE composite membrane(A, B) Photos of PTFE membrane and PANI/PTFE composite membrane, respectively; (C) the membrane surface appeared mirror-like; (D) removal CHCl3 from water using PANI/PTFE composite membrane; (E) CHCl3 in water was absorbed cleanly by PANI/PTFE composite membrane; (F, G) the diagrams of Wenzel state and Cassie state, respectively.
Fig.6 Optical microscopy images(A1—C1) and photos of the as-prepared emulsion before(A2—C2) and after(A3—C3) standing for 24 h(A1—A3) Water-in-toluene emulsion; (B1—B3) water-in-n-hexane emulsion; (C1—C3) water-in-trichloromethane emulsion.
Fig.7 Separation device(A), photo of emulsion and the collected filtrate(B), optical microscopy images of the emulsion(C) and the filtrate(D)
Fig.8 Recyclability of PANI/PTFE composite membraneInsets: upleft, initial water contact angle of PANI/PTFE composite membrane; uprigt, water contact angle of PANI/PTFE composite membrane after 4 cycles of filtration.
Fig.9 WCA of PANI/PTFE composite membrane after immersed in various organic solvents at r. t. for 8 h(A) and various aqueous solution for 48 h(B)(A) a. Trichloromethane; b. dichloromethane; c. n-hexane; d. toluene; e. isooctane. (B) a. Water, t=5 ℃; b. water, t=70 ℃; c. 1 mol/L NaCl, r. t.; d. 1 mol/L HCl, r. t.; e. 1 mol/L H2SO4, r. t..
Fig.10 Mechanical stability test of PANI/PTFE composite membrane under mechanical abrasion(A) and WCA of PANI/PTFE composite membrane after cyclic abrasion test(B)Insets in (B): upleft, initial water contact angle of PANI/PTFE composite membrane; upright, water contact angle of PANI/PTFE composite membrane after 50 cycles abrasion tests; downright, photo of PANI / PTFE composite membrane after 50 cycles abrasion tests.
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