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Research on Preparation of Conductive Forward Osmosis Membrane via embedding Carbon Nanotubes Layer and Its Mitigation of Organic Fouling

Authors： XU Mengsi, MA Guangxiang, YI Xiawen, MA Tao, WANG Xinhua

Units： 1. School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122; 2. Shandong Academy of Environmental Science Co. LTD., Jinan 250100; 3. Jiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, Wuxi 214122; 4. Jiangsu Cooperative Innovation Center of Technology and Material of Water Treatment, Suzhou 215009

KeyWords： forward osmosis membrane; carbon nanotube; conductive membrane; electric field; organic fouling

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(3):9-15

Abstract：

In order to mitigate organic fouling of forward osmosis (FO) membrane, a conductive composite forward osmosis (TFC-FO) membrane was firstly prepared in this paper via embedding an intermediate layer of carbon nanotubes (CNTs) between the porous polyethersulfone (PES) carrier and the polyamide (PA) active layer, and then its feasibility of alleviating organic fouling under the applied electric field was investigated. The results indicated that after adding the CNTs intermediate layer, compared with the conventional TFC-FO membrane, the surface roughness of the conductive TFC-FO membrane increased (46.85±6.55 nm VS 33.85±4.05 nm), and its surface resistance was greatly reduced (2.1×1012 Ω VS 54.7 Ω). In addition, the water flux of the conductive TFC-FO membrane was increased by 2.33 times, and its Js/ Jw value was reduced by about 4.72 times. During the fouling experiment without the electric field, although the flux decline of the conductive TFC-FO membrane decreased 1.9% compared with the conventional TFC-FO membrane, there was no difference in the quantity of the organic foulants. However, when applying a 2 V electric field, the flux drop rate of the conductive TFC-FO membrane reduced 10.1% and the foulants decreased 94.6%. The introduction of the CNTs intermediate layer effectively improves the performance of the FO membrane and alleviates the organic fouling with the help of the applied electric field.

Funds：

山东省重大科技创新工程项目（2018CXGC1006）；江苏省“六大人才高峰”高层次人才项目（JNHB-014）

AuthorIntro：

徐梦思（1996-），女，河南驻马店人，硕士生，主要从事膜法水处理技术研究

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