Zwitterionic carbon nanotube assisted thin-film nanocomposite membranes with excellent efficiency for separation of mono/divalent ions from brackish water

2017 ◽  
Vol 5 (26) ◽  
pp. 13730-13739 ◽  
Author(s):  
Junfeng Zheng ◽  
Meng Li ◽  
Yujian Yao ◽  
Xuan Zhang ◽  
Lianjun Wang
Keyword(s):  
Thin Film ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Atom Transfer Radical Polymerization ◽  
Brackish Water ◽  
Nanocomposite Membranes ◽  
Divalent Ions ◽  
Nanofiltration Membranes ◽  
Multiwalled Carbon ◽  
Thin Film Nanocomposite

Zwitterionization of multiwalled carbon nanotubes is conducted via atom transfer radical polymerization and ZCNTs obtained are used as an aqueous additive to fabricate thin-film nanocomposite nanofiltration membranes.

Preparation Thin Film Nanocomposite Membrane Incorporating PMMA Modified MWNT for Nanofiltration

2013 ◽  
Vol 562-565 ◽  
pp. 882-886 ◽  
Author(s):  
Chang Chao Yu ◽  
Hong Wei Yu ◽  
Yue Xia Chu ◽  
Hui Min Ruan ◽  
Jiang Nan Shen
Keyword(s):  
Thin Film ◽  
Carbon Nanotubes ◽  
Methyl Methacrylate ◽  
Multiwalled Carbon Nanotubes ◽  
Organic Phase ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Multiwalled Carbon ◽  
Selective Permeability ◽  
Thin Film Nanocomposite

Multiwalled carbon nanotubes (MWNTs) grafted by Poly(methyl methacrylate) (PMMA) can well disperse in organic solutions like toluene，which were synthesized via a microemulsion polymerization of methyl methacrylate (MMA) in the presence of acid-modified multiwalled carbon nanotubes (c-MWNTs). The polyamide thin-film nanocomposite (TFN) membranes with embedded PMMA-MWNTs were prepared using piperazine (PIP) and trimesoyl chloride (TMC) on a polyacrylonitrile (PAN) porous substrate via interfacial polymerization for selective permeability. PMMA-MWNTs’ structure was analyzed by Fourier transform infrared spectrophotometry (FTIR), Raman spectrophotmetry (RAM), Scanning electron microscope (SEM) and thermo gravimetric analysis (TGA). Orthogonal experiment was used to study the effect of PIP concentration, TMC concentration and concentration of PMMA-MWNTs in organic phase. The results showed that the membrane performances is good, Na2SO4 rejection is above 98% and water flux is up to 150% improvement over the TFC membrane as PIP in aqueous phase was 2g/L, TMC and PMMA-MWNTs in organic phase were 4g/L and 0.67g/L, respectively . Demonstrated PMMA-MWNTs in the nanofiltration membrane can improve selective permeability.

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