MOF in-situ growth modified poly(p-chloromethyl styrene)-polyvinylidene fluoride forward osmosis composite membrane and its anti-fouling performance for emulsified oil wastewater

CHEN Fen; DU Chunhui; HU Jintai; WU Chunjin

doi:10.13801/j.cnki.fhclxb.20220606.002

Volume 40 Issue 4

Apr. 2023

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CHEN Fen, DU Chunhui, HU Jintai, et al. MOF in-situ growth modified poly(p-chloromethyl styrene)-polyvinylidene fluoride forward osmosis composite membrane and its anti-fouling performance for emulsified oil wastewater[J]. Acta Materiae Compositae Sinica, 2023, 40(4): 2075-2084. doi: 10.13801/j.cnki.fhclxb.20220606.002

Citation:

CHEN Fen, DU Chunhui, HU Jintai, et al. MOF in-situ growth modified poly(p-chloromethyl styrene)-polyvinylidene fluoride forward osmosis composite membrane and its anti-fouling performance for emulsified oil wastewater[J]. Acta Materiae Compositae Sinica, 2023, 40(4): 2075-2084. doi: 10.13801/j.cnki.fhclxb.20220606.002

Citation:

CHEN Fen, DU Chunhui, HU Jintai, et al. MOF in-situ growth modified poly(p-chloromethyl styrene)-polyvinylidene fluoride forward osmosis composite membrane and its anti-fouling performance for emulsified oil wastewater[J]. Acta Materiae Compositae Sinica, 2023, 40(4): 2075-2084. doi: 10.13801/j.cnki.fhclxb.20220606.002

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MOF in-situ growth modified poly(p-chloromethyl styrene)-polyvinylidene fluoride forward osmosis composite membrane and its anti-fouling performance for emulsified oil wastewater

doi: 10.13801/j.cnki.fhclxb.20220606.002

School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, China

Funds: Public Research Project of Zhejiang Province (LGF21E080008)

Received Date: 2022-04-02
Accepted Date: 2022-05-21
Rev Recd Date: 2022-05-06

Available Online: 2022-06-06

Publish Date: 2023-04-15

Abstract

Abstract

Metal-organic framework (MOF) material is expected to improve the water flux and antifouling property of forward osmosis (FO) membrane, and improves its separation performance to emulsified oil wastewater. In order to introduce MOF into FO membrane, poly(p-chloromethyl styrene)-polyvinylidene fluoride (PCMS-PVDF) blend substrate was prepared by phase inversion method. The chloromethyl group (—CH₂Cl) in the substrate reacted with secondary or tertiary amine in 2-methylimidazole (Hmim), and then reacted with zinc nitrate (Zn(NO₃)₂). The antifouling FO membrane was prepared by in-situ growth of metal-organic zeolite imidazolium ester skeleton-8 (ZIF-8) and interfacial polymerization. The surface chemical structures and hydrophilic/hydrophobic property of substrate membrane and FO membrane were characterized by SEM, XPS, FTIR, contact angle analyzer and so on. The results show that ZIF-8 grows uniformly on the surface of PCMS-PVDF substrate, and the nanocrystals are cubic crystals with regular shape. Due to the presence of ZIF-8, the substrate surface is hydrophobic, but the new polyamide layer formed by interfacial polymerization makes the membrane surface hydrophilic again. The results show that the water flux of the FO membrane (PCMS-PVDF-FO) without ZIF-8 modification is only 12.4 L·m⁻²·h⁻¹, but the FO membrane (ZIF-8/PCMS-PVDF-FO) modified with ZIF-8 reach 20.7 L·m⁻²·h⁻¹ when using 1 mol/L NaCl as the drawing solution in FO mode. The separation experiment of emulsified oil simulated wastewater shows that the recovery ratio of pure water flux of FO membrane (ZIF-8/PCMS-PVDF-FO) is remained 89.9%, the total fouling ratio is 27.5% after running four cycles for pure water-emulsified oil separation. But under the same condition, the flux recovery rate of PCMS-PVDF-FO is only 66.9%, and the total fouling ratio increases to 66.2%. Based on the above, it can be seen that the FO composite membrane modified by in-situ growth of ZIF-8 exhibits excellent performance in emulsified oil wastewater separation.
- in-situ growth,
- ZIF-8,
- polyvinylidene fluoride,
- forward osmosis composite membrane,
- emulsified oil wastewater,
- MOF,
- anti-fouling performance
Long Abstrsct
Innovation Points

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References(30)

References

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