膜科学与技术

Position：Home >> Abstract

Preparation of Hydrophobic/Hydrophilic Composite Membrane Based on Nuclear track Membrane and Their Performances in DCMD

Authors： TANG Na, CHEN Nailin, Xiang Jun*, Tian Guiying

Units： 1.College of Chemical Engineering and Materials, Tianjin University of Science & Technology, Tianjin 300457, China; 2.Tianjin Key Laboratory of Brine Chemical Industry and Ecological Utilization of Resources, Tianjin 300457, Chin

KeyWords： nuclear track membrane; non-solvent induce phase separation; hydrophobic/hydrophilic membrane; direct contact membrane distillation

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(4):25-34

Abstract：

Nuclear track membrane generally possesses controllable pores, low heat resistance, high mechanical strength, and high acid/alkali resistance. In contrast to the non-woven fabrics-based membrane, nuclear track membrane displays much lower mass transfer resistance. In this paper, the nuclear track membrane is innovatively used as the base membrane, polyvinylidene fluoride (PVDF) is used as the bulk membrane material using N, N-dimethylacetamide (DMAc) solvent. The PVDF composite membrane is prepared by the non-solvent phase method. The microstructure, mechanical properties, hydrophobic property, and porosity of the composite membrane are discussed in terms of additive LiCl concentration and different nuclear track membranes. The results show that the high concentration of the LiCl additive increases the viscosity of the casting solution, resulting in a finger-like pore structure becomes smaller and the compact sponge structure in the composite membrane. The maximum peel strength of the PVDF/PET nuclear track composite membrane decreases from 4.48 N to 1.19 N, and the pore size decreases from 0.1327 μm to 0.0804 μm, the porosity decreased from 44.65% to 37.60%; the large pore size of the nuclear track membrane reduces the mechanical strength of the composite membrane. DCMD separation test exhibits that the flux of the PVDF composite membrane is about 30% higher than that of a single PVDF hydrophobic membrane at the same thickness; it stably runs 39 h in the stability test. Therefore, this work provides a new idea for high-flux membrane of distillation and shows a great potential to be utilized in the DCMD process.

Funds：

天津市自然科学基金（18JCZDJC37200）

AuthorIntro：

唐娜(1972-)，女，辽宁海城人，博士，教授，博士研究生导师。主要研究方向：膜分离，海卤水资源综合利用。

Reference：

[1] Eykens L, De Sitter K, Dotremont C, et al. How to Optimize the Membrane Properties for Membrane Distillation: A Review[J]. Ind Eng Chem Res, 2016, 55(35):9333-9343.
[2] Bonyadi S, Chung T S. Flux enhancement in membrane distillation by fabrication of dual layer hydrophilic-hydrophobic hollow fiber membranes[J]. J Membr Sci, 2007, 306(1-2):134-146.
[3] Ke H, Feldman E, Guzman P, et al. Electrospun polystyrene nanofibrous membranes for direct contact membrane distillation[J]. J Membr Sci, 2016, 515:86-97.
[4] Hou D, Dai G, Fan H, et al. Effects of calcium carbonate nano-particles on the properties of PVDF/nonwoven fabric flat-sheet composite membranes for direct contact membrane distillation[J]. Desalination. 2014, 347:25-33.
[5] Teoh M M, Chung T S, Yeo Y S. Dual-layer PVDF/PTFE composite hollow fibers with a thin macrovoid-free selective layer for water production via membrane distillation[J]. Chem Eng J, 2011, 171(2):684-691.
[6] Zhao L, Wu C, Lu X, et al. Theoretical guidance for fabricating higher flux hydrophobic/hydrophilic dual-layer membranes for direct contact membrane distillation[J]. J Membr Sci. 2020, 596:117608.
[7] Khayet M, Matsuura T, Mengual J I. Porous hydrophobic/hydrophilic composite membranes: Estimation of the hydrophobic-layer thickness[J]. J Membr Sci, 2005, 266(1-2):68-79.
[8] Khayet M, Mengual J I, Matsuura T. Porous hydrophobic/hydrophilic composite membranes: Application in desalination using direct contact membrane distillation[J]. J Membr Sci, 2005, 252(1-2):101-113.
[9] Su M, Teoh M M, Wang K Y, et al. Effect of inner-layer thermal conductivity on flux enhancement of dual-layer hollow fiber membranes in direct contact membrane distillation[J]. J Membr Sci, 2010, 364(1-2):278-289.
[10] Zuo J, Chung T S, O’Brien G S, et al. Hydrophobic/hydrophilic PVDF/Ultem® dual-layer hollow fiber membranes with enhanced mechanical properties for vacuum membrane distillation[J]. J Membr Sci, 2017, 523:103-110.
[11] Li J, Ren L F, Shao J, et al. Fabrication of triple layer composite membrane and its application in membrane distillation (MD): Effect of hydrophobic-hydrophilic membrane structure on MD performance[J]. Sep Purif Technol, 2020, 234:116087.
[12] 蔡畅, 陈琪, 苗晶,等. 聚碳酸酯和聚酯核孔膜的性能研究[J]. 核技术, 2017, 40(10).
[13] 吴逸昌,王雪,蒋秋冉,等. PET精密输液过滤核孔膜亲水化处理研究[J]. 纺织报告, 2018(10):30-33+74.
[14] Hou D, Fan H, Jiang Q, et al. Preparation and characterization of PVDF flat-sheet membranes for direct contact membrane distillation[J]. Sep Purif Technol, 2014, 135(1):211-222.
[15] Hou D, Dai G, Wang J, et al. Preparation and characterization of PVDF/nonwoven fabric flat-sheet composite membranes for desalination through direct contact membrane distillation.[J] Sep Purif Technol, 2012, 101:1-10.
[16] Fan H, Peng Y. Application of PVDF membranes in desalination and comparison of the VMD and DCMD processes.[J] Chemical Engineering Science. 2012, 79:94-102.
[17] Zhu J, Jiang L, Matsuura T. New insights into fabrication of hydrophobic/hydrophilic composite hollow fibers for direct contact membrane distillation[J]. Chem Eng Sci, 2015, 137:79-90.

Service：

【Download】【Collect】

《膜科学与技术》编辑部 Address: Bluestar building, 19 east beisanhuan road, chaoyang district, Beijing; 100029 Postal code; Telephone：010-80492417/010-80485372; Fax：010-80485372 ; Email：mkxyjs@163.com