Hydrolyzed polyacrylonitrile /graphene conductive membrane applied in forward osmosis

• Main Authors: Tzu-Ching Huang, 黃子慶
• Other Authors: Kueir-Rarn Lee
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/28452228532998151660

碩士 === 中原大學 === 化學工程研究所 === 105 === In this study, Polyacrylonitrile (PAN) with different graphene (Gr) nanosheets loading amounts was used to fabricate PAN/Gr hybrid membrane. The membranes were hydrolyzed by using 2M NaOH(aq) to prepare the HPAN/Gr forward osmosis (FO) membrane. After the addition of graphene, the membrane became good electro/heat-conductive material and also has improved mechanical strength. The membranes were characterized by FE-SEM、FTIR、water contact angle、XRD、mechanical strength test、electric conductivity test、heat transfer test and FO test. The graphene nanosheet can transform the structure of membrane from dense to layered structure which can create channel for water to pass through. Additionally, after hydrolysis reaction, both the chemical and physical properties of membrane have significantly changed, the membrane surface became more hydrophilic and increase water penetration speed that can enhance the FO performance of membrane. With this unique structure and high hydrophlicity, the membrane can provide water flux of 6.62±2.73 LMH, salt reverse flux of 4.76±0.75 gMH in FO (Membrane condition : HPAN/Gr40-24, Draw solution: 2M NaCl, Feed solution: Distilled water). Additionally, we could control the salt reverse flux by applying different voltage on the membrane, this may cause electrostatic attraction when electric current passes through the membrane. This study may offer new strategies for the development of advance FO membrane which have tunable selectivity.