Environmental Engineering Reference
In-Depth Information
adsorption of MO onto MWCNTs and m-CS/γ-Fe
2
O
3
/MWCNTs, observed that
adsorption of MO onto MWCNTs was endothermic. CS is responsible for the
exothermic adsorption process because with the increase in the temperature, poly-
meric network of CS changed/de-shaped, which reduced the porosity of the bio
sorbent and hindered the diffusion of dye molecules at high temperature [72, 73].
A fast separation process is obtained by magnetic separation technology.
Therefore, the adsorption technique with magnetic separation has aroused wide
concern. However, the highest maximum adsorption capacity is not high enough.
Polymer shows excellent sewage treatment capacity in the environmental pro-
tection. Recently reported that the decolorization efficiency could get close to
100% in the direct light resistant black G solution by P(AM-DMC) (copolymer
of acrylamide and 2-[(methacryloyloxy) ethyl] trimethyl ammonium chloride).
Therefore, the integration of CNTs, magnetic materials and polymer could over-
come those defects of low adsorption capacity, long adsorption time, separation
inconvenience and secondary pollution However, there were few reports about
such nanocomposite. Herein, the first attempt to prepare the MPMWCNT nano-
composite with the aid of ionic liquid-based polyether and Ferroferric oxide was
made. The structure of the nanocomposite was characterized and the physical
properties were investigated in detail. Combined with the characteristics of the
three materials, the magnetic nanocomposite shows excellent properties of short
contact time, large adsorption capacity, rapid separation process and no secondary
pollution in the adsorption process. This chapter could provide new adsorption
insights in wastewater treatment. Then, the pH value of the final suspensions was
adjusted to 10-11 and the redox reaction continued for 30 min with stirring. The
MPMWCNT nanocomposite was separated by a permanent magnet and dried un-
der vacuum. The yield of the nanocomposite was about 66.5% [83].
Earlier studies have indicated that magnetic carbon nanocomposites may show
great application potential in magnetic data storage, for magnetic toners in xerog-
raphy, Ferro fluids, magnetic resonance imaging, and reversible lithium storage.
However, there is still lack of a systematic review on the synthesis and application
of carbon-based/magnetic nanoparticle hybrid composites. So here we present
a short review on the progress made during the past two decades in synthesis
and applications of magnetic/carbon nanocomposites, and synthesis of magnetic
carbon nanocomposites. During the last decade, much effort has been devoted
to efficient synthetic routes to shape-controlled, highly stable, and well defined
magnetic carbon hybrid nanocomposites. Several popular methods including fill-
ing process, template-based synthesis, chemical vapor deposition, hydrothermal/
solvothermal method, pyrolysis procedure, sol-gel process, detonation induced
reaction, self-assembly method, etc., can be directed at the synthesis of high-qual-
ity magnetic carbon nanocomposites. Examples for the applications of such ma-
terials include environmental treatment, microwave absorption, electrochemical
engineering, catalysis, information storage, biomedicine and biotechnology [83].
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