Preparation of Small Mesoporous SiO2 Particles with Asymmetric Tunnel Structure and Fabrication of the Resulting Hybrid Membranes

doi:10.7503/cjcu20200527

Abstract

Abstract:

Through a soft template method using chiral anionic acid as a surfactant， small mesoporous SiO₂ particles with asymmetric tunnel structures were firstly prepared. Then， the small mesoporous SiO₂ particles were incorporated into polyvinylidene fluoride（PVDF） and polyimide（PI） to fabricate two kinds of organic-inorganic hybrid membranes. Fourier transform infrared spectrometer（FTIR）， transmission electron microscope（TEM）， Scanning electron microscope（SEM） and Brunner-Emmet-Teller（BET） measurement were employed to characterize the microstructure of the small mesoporous SiO₂ and the resulting organic- inorganic hybrid membranes. The performance of the PVDF and PI hybrid membranes were evaluated by ultrafiltration and gas permeation experiments， respectively. The results showed that the small mesoporous SiO₂ particles with a lot of hydrophilic groups on its surface had a regular and orderly arranged pore structure， which presented spiral twists and asymmetry. Addition of small mesoporous SiO₂ particles would significantly improve the polarity of the two kinds of hybrid membranes， thereby effectively enhancing the anti-pollution performance of the PVDF membranes and the performance of the PI membranes for CO₂ separation. Moreover， the tunnel structures of mesoporous SiO₂ could also introduce a confined mass transfer channel， which could accelerate the diffusion of CO₂ molecule through the PI hybrid membrane. Addition of too many mesoporous SiO₂ caused the formation of aggregates in the polymer membranes， which weakened the polarity and hydrophilicity of membranes， thereby depressing the performance of the two kinds of hybrid membranes.

Key words: Small mesoporous SiO₂ particles, Asymmetric channel structure, Organic-inorganic hybrid membrane, Gas permeation, Ultrafiltration

CLC Number:

O631

TrendMD:

TONG Cheng, WU Wentao, WANG Ting. Preparation of Small Mesoporous SiO₂ Particles with Asymmetric Tunnel Structure and Fabrication of the Resulting Hybrid Membranes[J]. Chem. J. Chinese Universities, 2021, 42(3): 946.

Figures/Tables 15

References 31

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Membrane	Porosity, ε (%)	Mean pore size, r_m/nm	Static water contact angles/(°)
M0	39.4	30.0	91.6
M1	68.9	39.4	80.1
M3	69.1	44.4	79.6
M5	72.8	52.5	79.1
M7	70.8	50.2	83.8

Membrane	Porosity, ε (%)	Mean pore size, r_m/nm	Static water contact angles/(°)
M0	39.4	30.0	91.6
M1	68.9	39.4	80.1
M3	69.1	44.4	79.6
M5	72.8	52.5	79.1
M7	70.8	50.2	83.8

Membrane	Addition content of SBA?15, w(%)	Porosity, ε(%)	Mean pore size, r_m/nm	Static water contact angles/(°)
S0	0	39.4	30.0	91.6
S1	1.0	58.2	38.4	86.3
S3	3.0	61.1	41.2	83.5
S5	5.0	67.9	43.5	87.6
S7	7.0	64.1	41.2	88.7

Membrane	Addition content of SBA?15, w(%)	Porosity, ε(%)	Mean pore size, r_m/nm	Static water contact angles/(°)
S0	0	39.4	30.0	91.6
S1	1.0	58.2	38.4	86.3
S3	3.0	61.1	41.2	83.5
S5	5.0	67.9	43.5	87.6
S7	7.0	64.1	41.2	88.7

Membrane	Addition content of SiO₂, w(%)	Zeta value/mV	Static water contact angles/(°)
P0	0	-42.21	79.8
P1	1.0	-68.48	61.8
P3	3.0	-71.53	52.3
P5	5.0	-65.35	56.1
P7	7.0	-63.01	61.0

Preparation of Small Mesoporous SiO₂ Particles with Asymmetric Tunnel Structure and Fabrication of the Resulting Hybrid Membranes

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Figures/Tables 15

References 31

Related Articles 15

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Membrane	Addition content of SiO₂, w(%)	10^-8Diffusivity/(cm²·s^-1)
Membrane	Addition content of SiO₂, w(%)	CO₂	N₂
P0	0	1.25	0.52
P1	1.0	2.47	0.85
P3	3.0	2.69	0.93
P5	5.0	2.31	0.77
P7	7.0	1.55	0.66

Membrane	Gas permeability /Barrer ^*		Idea selectivity	10^-8Diffusivity/(cm²·s^-1)
Membrane	CO₂	N₂	CO₂/N₂	CO₂	N₂
SP0	49.2	34.6	1.42	1.25	0.52
SP1	280.8	120.8	2.32	2.53	2.02
SP3	383.6	150.6	2.54	2.33	1.93
SP5	333.8	152.0	2.20	2.01	1.77
SP7	268.9	158.8	1.69	1.67	1.31

Membrane	Gas permeability /Barrer ^*		Idea selectivity	10^-8Diffusivity/(cm²·s^-1)
Membrane	CO₂	N₂	CO₂/N₂	CO₂	N₂
SP0	49.2	34.6	1.42	1.25	0.52
SP1	280.8	120.8	2.32	2.53	2.02
SP3	383.6	150.6	2.54	2.33	1.93
SP5	333.8	152.0	2.20	2.01	1.77
SP7	268.9	158.8	1.69	1.67	1.31