Polydopamine-mediated surface functionalization of electrospun nanofibrous membranes: Preparation, characterization and their adsorption properties towards heavy metal ions.
Chunlin Wu, Heyun Wang, Zhong Wei , Chuan Li, Zhidong Luo
Applied Surface Science,Volume 346, 15 August 2015, Pages 207–215
Graphical abstract

Abstract
In this paper, a simple
and versatile approach for the fabrication of a polyethyleneimine
(PEI)-functionalized nanofibrous membrane utilizing polydopamine (PDA) as a
mediator is proposed. The morphology and structure of the PDA-coated and
PEI-grafted nanofibrous membranes were confirmed using scanning electron
microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and attenuated total
reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. Due to a
large specific surface area and long fibrous morphology, the synthesized
membranes were used as novel adsorbents for copper ion (Cu2+) removal from
aqueous solutions. The adsorption of Cu2+ was investigated on the synthesized
membranes regarding the membrane dosages, initial solution pH values, initial
solution concentrations, contact times and temperatures. In addition, the
adsorption equilibrium data of PEI-grafted membranes were well fitted with
the Langmuir adsorption isotherm, and a maximum adsorption capacity value of
33.59 mg g−1 was determined (while
it was 21.94 mg g−1 for the PDA-coated membranes). The thermodynamic
parameters indicated that Cu2+ absorption was a spontaneous and exothermic
adsorption process. In addition, XPS peak differentiation imitating analysis
permitted the proposal of a copper-amine coordination adsorption mechanism
that can be used to explain changes in the adsorption properties compared to
PDA coating nanofibrous membranes.静电纺丝
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