The effects of microwave regeneration on adsorptive performance of functionalized carbon nanotubes

2016 ◽  
Vol 73 (11) ◽  
pp. 2638-2643 ◽  
Author(s):  
Shahab Karimifard ◽  
Mohammad Reza Alavi Moghaddam
Keyword(s):  
Carbon Nanotubes ◽  
Functional Groups ◽  
Dye Molecules ◽  
Functionalized Carbon Nanotubes ◽  
Microwave Regeneration ◽  
High Regeneration ◽  
Cnts Surface ◽  
Sudden Decrease ◽  
Adsorption Desorption ◽  
Very High

In this study, the microwave regeneration method was applied to investigate the properties and adsorptive performance of functionalized carbon nanotubes (f-CNTs) in different cycles of regeneration/reuse. For this purpose, an organic and hazardous dye (Reactive Blue 19) was chosen as a widely used pollutant. N2 adsorption/desorption isotherms, scanning electron microscopy and Fourier transform infrared spectroscopy were used to characterize f-CNTs during the regeneration/reuse procedure. The morphology, specific surface area and pore volume of f-CNT samples were not significantly altered. However, the functional groups present on the f-CNTs’ surface were gradually removed after successive cycles of regeneration/reuse. A sudden decrease of adsorption capacity (about 20%) after the first cycle of regeneration/reuse was attributed to the elimination of functional groups interacting with the dye molecules because of the molecular-level heating. Relatively high regeneration efficiencies (73.30 to 80.16%) proved that the microwave regeneration method was successful. Very high step stripping efficiencies (80.16 to 98.02%) in four cycles of regeneration/reuse demonstrated that the microwave regeneration method could be utilized in consecutive cycles. After four cycles of regeneration/reuse, the CNTs could not be considered as functionalized.

scholarly journals Low Kinetic Energy Oxygen Ion Irradiation of Vertically Aligned Carbon Nanotubes

2019 ◽  
Vol 9 (24) ◽  
pp. 5342 ◽  
Author(s):  
Selene Acosta ◽  
Juan Casanova Chafer ◽  
Ayrton Sierra Castillo ◽  
Eduard Llobet ◽  
Rony Snyders ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Kinetic Energy ◽  
Functional Groups ◽  
Ion Irradiation ◽  
Relative Concentration ◽  
Oxygen Plasma Treatment ◽  
Oxygen Ion ◽  
Cnts Surface ◽  
Vertically Aligned

Vertically aligned multiwalled carbon nanotubes (v-CNTs) were functionalized with oxygen groups using low kinetic energy oxygen ion irradiation. X-ray photoelectron spectroscopy (XPS) analysis indicates that oxygen ion irradiation produces three different types of oxygen functional groups at the CNTs surface: epoxide, carbonyl and carboxyl groups. The relative concentration of these groups depends on the parameters used for oxygen ion irradiation. Scanning electron microscopy (SEM) shows that the macroscopic structure and alignment of v-CNTS are not affected by the ion irradiation and transmission electron microscopy (TEM) proves tip functionalization of v-CNTs. We observed that in comparison to oxygen plasma treatment, oxygen ion irradiation shows higher functionalization efficiency and versatility. Ion irradiation leads to higher amount of oxygen grafting at the v-CNTs surface, besides different functional groups and their relative concentration can be tuned varying the irradiation parameters.

Surface functional groups and defects on carbon nanotubes affect adsorption–desorption hysteresis of metal cations and oxoanions in water

2014 ◽  
Vol 1 (5) ◽  
pp. 488-495 ◽  
Author(s):  
Jie Li ◽  
Changlun Chen ◽  
Shouwei Zhang ◽  
Xiangke Wang
Keyword(s):  
Carbon Nanotubes ◽  
Specific Surface ◽  
Surface Area ◽  
Functional Groups ◽  
Metal Ion ◽  
Ion Adsorption ◽  
Surface Functional Groups ◽  
Metal Ion Adsorption ◽  
Desorption Hysteresis ◽  
Adsorption Desorption

This study probed the effects of functional groups, specific surface area and defects on metal ion adsorption and desorption.

Pristine Functionalized Carbon Nanotubes from Ethanol Flame as a Reinforcement in Polystyrene Composite

2011 ◽  
Vol 266 ◽  
pp. 184-187
Author(s):  
Xiang Qi ◽  
Long Ren ◽  
Guo Lin Hao ◽  
Jun Li ◽  
Peng Fei Fang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Surface Chemistry ◽  
Functional Groups ◽  
Post Treatment ◽  
Functionalized Carbon Nanotubes ◽  
Polystyrene Matrix ◽  
Ethanol Flame

The surface chemistry of carbon nanotubes (CNTs) synthesized from ethanol flame was investigated using FTIR, TG, XPS and TEM. It is found that the CNTs inherently have functional groups on their surfaces without any post-treatment. SEM results confirm that the pristine F-CNTs can be well dispersed in the polystyrene matrix.

Water desalination through rim functionalized carbon nanotubes

2019 ◽  
Vol 7 (8) ◽  
pp. 3583-3591 ◽  
Author(s):  
Yang Hong ◽  
Jingchao Zhang ◽  
Chongqin Zhu ◽  
Xiao Cheng Zeng ◽  
Joseph S. Francisco
Keyword(s):  
Carbon Nanotubes ◽  
Dipole Moment ◽  
Carbon Nanotube ◽  
Functional Groups ◽  
Water Desalination ◽  
Functionalized Carbon Nanotubes

Understand the influence of the dipole moment between carbon nanotube rim and anchored functional groups on water desalination performance.

scholarly journals Molecular dynamics simulation study of doxorubicin adsorption on functionalized carbon nanotubes with folic acid and tryptophan

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tahereh Arabian ◽  
Sepideh Amjad-Iranagh ◽  
Rouein Halladj
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Dynamics ◽  
Aqueous Solution ◽  
Folic Acid ◽  
Drug Release ◽  
Functional Groups ◽  
Dynamics Simulation ◽  
Repulsive Interaction ◽  
Functionalized Carbon Nanotubes ◽  
Ph Variation

AbstractIn this work, molecular dynamics (MD) simulation is used to study the adsorption of the anticancer drug, doxorubicin (DOX), on the wall or surface of pristine and functionalized carbon nanotubes (FCNTs) in an aqueous solution. Initially, the CNTs were functionalized by tryptophan (Trp) and folic acid (FA), and then the DOX molecules were added to the system. The simulation results showed that the drug molecules can intensely interact with the FCNTs at physiological pH. Furthermore, it was found that as a result of functionalization, the solubility of FCNTs in an aqueous solution increases significantly. The effect of pH variation on drug release from both pristine and FCNTs was also investigated. The obtained results indicated that in acidic environments due to protonation of functional groups (Trp) and as a result of repulsive interaction between the DOX molecule and functional groups, the release of DOX molecules from FCNT’s surface is facilitated. The drug release is also strongly dependent on the pH and protonated state of DOX and FCNT.

scholarly journals Oxygen/Carbon Ratio Effects on Surface-Modified Carbon Nanotubes

2008 ◽  
Vol 2 ◽  
pp. 77-84 ◽  
Author(s):  
U.S. Chen ◽  
Heng Yi Su ◽  
Chung Hao Wang ◽  
Han Chang Shih ◽  
Chien Te Hsieh ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Functional Groups ◽  
Photoelectron Spectroscopy ◽  
Simple Method ◽  
X Ray ◽  
Oxygen Treatment ◽  
Gauss Function ◽  
Cnts Surface ◽  
Surface Modified ◽  
Modified Carbon Nanotubes

Carbon nanotubes (CNTs) were functionalized using a simple method of heat treatment under oxygen atmosphere followed by an immersion in a tin nitrate aqueous solution. And well-dispersed SnOx nanodots were decorated on the surface of CNTs. X-ray photoelectron spectroscopy (XPS) analysis showed that the O/C ratio increases with oxygen-treated time. The distribution of carbon-containing functional groups on the CNTs surface, i.e., C−C, C−O, C=O, O−C=O, and π−π* shake up bonds can be identified and deconvoluted by a symmetrical Gauss function. The contact angle of H2O and CNTs is dependent on O/C ration. The relationships between the fraction of carbon-containing functional groups and various oxygen treatment times are also discussed.

Research on Plasma Inducing-Graft Functionalized CNTs and their Epoxy Resin Composites

2011 ◽  
Vol 66-68 ◽  
pp. 1027-1032
Author(s):  
Run Ping Jia ◽  
L. Tao ◽  
K. S. Zheng
Keyword(s):  
Carbon Nanotubes ◽  
Epoxy Resin ◽  
Mechanical And Thermal Properties ◽  
Resin Composites ◽  
Functionalized Carbon Nanotubes ◽  
Aggregation Problem ◽  
Cnts Surface ◽  
Plasma Methods ◽  
Epoxy Resin Composites ◽  
Ar Plasma

In this work, highly functionalized carbon nanotubes (CNTs) were achieved using plasma inducing-graft technique, in which maleic anhydride (MAH) was used as graft monomer. Then they were introduced into epoxy resin (EP) curing system to obtain CNTs/EP composites. The modification performance of this proposed method was summarized and contrasted with that of argon (Ar) plasma atmosphere. Results show that these two plasma methods can improve CNTs’ surface activity, and corresponding optimum powers are both 60 W. Meanwhile, thin polymaleic anhydride film can be coated on the surface of CNTs during MAH plasma inducing-graft, which can make sure of effectively dispersion and adhesion of CNTs in epoxy. Such treatment can not only obtain highly functionalized CNTs, but also overcome its serious self-entangling and aggregation problem. Compared with those composites modified by argon (Ar) plasma, the mechanical and thermal properties of CNTs/EP composites modified by MAH plasma are greatly enhanced.

scholarly journals Removal of dye molecules from aqueous solution by carbon nanotubes and carbon nanotube functional groups: critical review

RSC Advances ◽  
2017 ◽  
Vol 7 (74) ◽  
pp. 47083-47090 ◽  
Author(s):  
M. Rajabi ◽  
K. Mahanpoor ◽  
O. Moradi
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Carbon Nanotube ◽  
Functional Groups ◽  
Critical Review ◽  
Dye Molecules

Scheme for the adsorption of dye molecules by CNTs and CNT functionality.

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