Multiwall carbon nanotubes amino-functionalized

Mallakpour S, Zadehnazari A. The production of functionalized multiwall carbon nanotube/amino acid-based poly(amide-imide) composites containing a pendant dopamine moiety. Carbon 2013 56 27-37. 

CS-based mixed matrix membranes and nanocomposite membranes are much useful in heavy metal removal. Salehi et al. [82] synthesized amine functionalized multiwalled carbon nanotubes (F-MWCNTs) and utilized to prepare novel CS/polyvinyl alcohol (PVA) thin adsorptive membranes for copper ion removal from water. Copper ion adsorption on the membranes was more favorable at higher CNT contents as well as increased temperatures. The adsorption capacity of the membrane containing 2 wt.% CNTs (20.1 mg/g at 40°C) was almost twice as large as that of the plain membrane (11.1 mg/g). Salehi et al. [83] used PE glycol and amino-modified MWCNTs to modify CS/PVA thin adsorptive membranes for copper ion adsorption. Adsorption capacity of CS/PVA membrane was increased from 11 to 30 mg/g by the addition of 5 wt.% PEG to the blend. Addition of CNTs,... 

The surface modification can aim at different goals for example, the purpose could be the achievement of a superior chemical compatibility between the two phases through the addition of bridging agents [82]. The modification of the CNTs surface is frequently reported to increase their affinity with polymer solution. One example has been reported in the literature to obtain MMMs of multiwalled carbon nanotubes (MWNTs) in hydrophilic polymer blends for the synthesis of gas separation membranes. Acidification [62] and amino functionalization [56] of the fillers have been performed to increase their dispersability in an aqueous-based casting solution and to offer a reactive moiety for further crosslinking with polymer chains. 

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