TY - JOUR
T1 - Microporous polyimide VOC-rejective membrane for the separation of nitrogen/VOC mixture
AU - Zhang, Chi
AU - Gao, Xue
AU - Qin, Jinchao
AU - Guo, Qingkai
AU - Zhou, Haoli
AU - Jin, Wanqin
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/1/15
Y1 - 2021/1/15
N2 - The treatment of VOCs (volatile organic compounds) in waste streams is very important. Herein, we propose to use a network microporous polyimide (PI) membrane for the molecular sieving of nitrogen over VOC molecules to control their emission. 2,6,14-triaminotriptycene (Trip) was reacted with aromatic dianhydride monomers, such as 3,3′,4,4′-benzophenone tetracarboxylic dianhydride (BTDA), to synthesize ultramicroporous polyimides, which readily form composite membranes via solution coating. The properties of the PIs were characterized by X-ray photoelectron spectroscopy (XPS), Brunner-Emmet-Teller (BET) analysis, etc., which validated the formation of a network structure and ultramicroporosity in these polyimides. Therefore, the outstanding separation performance for the separation of nitrogen over VOCs, such as cyclohexane, by molecular sieving was obtained by using these membranes; a rejection higher than 99 % was realized with a permeability of approximately 2000∼2600 Barrer under a temperature of 25 °C and feed concentration of 30,000 ± 2000 ppm. Finally, the stability of the Trip-BTDA-PI membrane over time was studied.
AB - The treatment of VOCs (volatile organic compounds) in waste streams is very important. Herein, we propose to use a network microporous polyimide (PI) membrane for the molecular sieving of nitrogen over VOC molecules to control their emission. 2,6,14-triaminotriptycene (Trip) was reacted with aromatic dianhydride monomers, such as 3,3′,4,4′-benzophenone tetracarboxylic dianhydride (BTDA), to synthesize ultramicroporous polyimides, which readily form composite membranes via solution coating. The properties of the PIs were characterized by X-ray photoelectron spectroscopy (XPS), Brunner-Emmet-Teller (BET) analysis, etc., which validated the formation of a network structure and ultramicroporosity in these polyimides. Therefore, the outstanding separation performance for the separation of nitrogen over VOCs, such as cyclohexane, by molecular sieving was obtained by using these membranes; a rejection higher than 99 % was realized with a permeability of approximately 2000∼2600 Barrer under a temperature of 25 °C and feed concentration of 30,000 ± 2000 ppm. Finally, the stability of the Trip-BTDA-PI membrane over time was studied.
KW - Microporous polyimide
KW - Molecular sieving
KW - Network structure
KW - VOC-rejective membrane
KW - Volatile organic compounds
UR - http://www.scopus.com/inward/record.url?scp=85090929416&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2020.123817
DO - 10.1016/j.jhazmat.2020.123817
M3 - 文章
C2 - 33254806
AN - SCOPUS:85090929416
SN - 0304-3894
VL - 402
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 123817
ER -