Preparation and Performance of Self-standing NH2-MIL-125/polyoxadiazole Composite Forward Osmosis Membranes †

doi:10.7503/cjcu20190697

Abstract

Abstract:

A high-strength hydrophilic carboxyl-containing polyoxadiazole material(POD-COOH) and an amino-containing metal organic frame material(NH₂-MIL-125) were synthesized first, then a series of novel self-standing composite forward osmosis membranes were prepared using NH₂-MIL-125 as filler and POD-COOH as matrix by solution blending and casting method. Further the effects of NH₂-MIL-125 introduction on the structure and performance of composite forward osmosis membranes were investigated. The results demonstrated that the prepared self-standing composite forward osmosis membranes had a dense homogeneous structure. The hydrophilicity and electronegativity of the membranes were improved with increasing NH₂-MIL-125 content. And the composite membranes maintained good mechanical properties. When the testing feed and draw solutions were pure water and 1.5 mol/L Na₂SO₄ solution respectively, the prepared self-standing composite membranes exhibited excellent forward osmosis performance, which is attributed to the elimination of internal concentration polarization existing in support layer of traditional forward osmosis membranes.

Key words: Self-standing forward osmosis membrane, Polyoxadiazole, Internal concentration polarization

CLC Number:

O631

TrendMD:

HE Nan, LIU Wei, YANG Xia, WANG Xianze, CUI Xiaochun, WU Jinghui, GENG Zhi. Preparation and Performance of Self-standing NH₂-MIL-125/polyoxadiazole Composite Forward Osmosis Membranes ^†[J]. Chem. J. Chinese Universities, 2020, 41(6): 1370.

Figures/Tables 13

References 25

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Membrane sample	Thicknesses/μm	Water contact angle/(°)	Zeta potential/mV	Tensile strength/MPa
POD	5.0	78.7	-6.2	62.5
POD-COOH	5.0	75.0	-32.1	70.1
1%NH₂-MIL-125/POD-COOH	5.0	73.1	-37.3	56.2
3%NH₂-MIL-125/POD-COOH	5.0	72.0	-41.5	51.3
5%NH₂-MIL-125/POD-COOH	5.0	71.0	-45.2	46.6

Membrane sample	Thicknesses/μm	Water contact angle/(°)	Zeta potential/mV	Tensile strength/MPa
POD	5.0	78.7	-6.2	62.5
POD-COOH	5.0	75.0	-32.1	70.1
1%NH₂-MIL-125/POD-COOH	5.0	73.1	-37.3	56.2
3%NH₂-MIL-125/POD-COOH	5.0	72.0	-41.5	51.3
5%NH₂-MIL-125/POD-COOH	5.0	71.0	-45.2	46.6

Membrane sample	J_w/(L·m^-2·h^-1)	J_s/(g·m^-2·h^-1)	J_s/J_w/(g·L^-1)
POD	12.2	22.8	1.87
POD-COOH	18.1	8.0	0.44
1%NH₂-MIL-125/POD-COOH	24.3	9.8	0.40
3%NH₂-MIL-125/POD-COOH	27.4	10.5	0.38
5%NH₂-MIL-125/POD-COOH	30.2	13.1	0.43
Commercial FO membrane(HTI-CTA)	9.4	4.7	0.50

Membrane sample	J_w/(L·m^-2·h^-1)	J_s/(g·m^-2·h^-1)	J_s/J_w/(g·L^-1)
POD	12.2	22.8	1.87
POD-COOH	18.1	8.0	0.44
1%NH₂-MIL-125/POD-COOH	24.3	9.8	0.40
3%NH₂-MIL-125/POD-COOH	27.4	10.5	0.38
5%NH₂-MIL-125/POD-COOH	30.2	13.1	0.43
Commercial FO membrane(HTI-CTA)	9.4	4.7	0.50

Preparation and Performance of Self-standing NH₂-MIL-125/polyoxadiazole Composite Forward Osmosis Membranes ^†

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