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.

The Generation of a Carbon Nanotube- Cyclodextrin Complex

2001 ◽  
Vol 703 ◽  
Author(s):  
G.F. Farrell ◽  
G. Chambers ◽  
A.B Dalton ◽  
E. Cummins ◽  
M. McNamara ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Raman Spectroscopy ◽  
Carbon Nanotube ◽  
Intermolecular Interaction ◽  
Intermolecular Interactions ◽  
Small Diameter ◽  
Cyclodextrin Complex ◽  
Yellow Solution ◽  
Single Wall Nanotubes

ABSTRACTIn this study the intermolecular interactions of small diameter (∼0.7nm) carbon nanotubes and γ-cyclodextrin were examined. Four samples of γ cyclodextrin and HiPco carbon nanotubes were prepared. The first, by grinding the tubes and the cyclodextrin (1:30 ratio) together in a dry mixture, the second was prepared in a similar fashion but was ground in the presence of water (1ml). Finally an aqueous solution of γ-cyclodextrin (0.3M) and HiPco carbon nanotubes (5mg) was prepared by refluxing for ∼100 hours, forming a pale yellow solution from which a number of crystals were produced, both the solution and the recrystallised material were analysed. The samples were analysed using UV-Vis-NIR and Raman spectroscopy. The results presented are the first spectroscopic evidence of an intermolecular interaction between γ-cyclodextrin and single wall nanotubes.

Pebax-1657 mixed matrix membrane containing surface modified multi-walled carbon nanotubes for gas separation

RSC Advances ◽  
2016 ◽  
Vol 6 (83) ◽  
pp. 79563-79577 ◽  
Author(s):  
S. A. Habibiannejad ◽  
A. Aroujalian ◽  
A. Raisi
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Functional Groups ◽  
Gas Separation ◽  
Mixed Matrix Membrane ◽  
Mixed Matrix ◽  
Multi Walled Carbon Nanotubes ◽  
Surface Modified ◽  
Walled Carbon Nanotubes

In this study different functional groups on the surface of carbon nanotube enhanced the performance of Pebax 1657/MWNTs.

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.

Self-assembly fabrication of a graphene/multi-walled carbon nanotube hybrid material for suppressing potential heat radiation and toxic effluent

RSC Advances ◽  
2015 ◽  
Vol 5 (125) ◽  
pp. 103365-103372 ◽  
Author(s):  
Lei Liu ◽  
Dong Wang ◽  
Yuan Hu
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Graphene Oxide ◽  
Carbon Nanotube ◽  
Hybrid Material ◽  
Self Assembly ◽  
Heat Radiation ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Negative graphene oxide was combined with positive chitosan-modified multi-walled carbon nanotubes in aqueous solution and then thermally reduced to fabricate a multi-walled carbon nanotube/graphene (MWCNT/G) hybrid material.

Mechanical Properties of Functionalized Carbon Nanotube as Reinforcements

2012 ◽  
Vol 583 ◽  
pp. 22-26 ◽  
Author(s):  
Cui Cui Ling ◽  
Qing Zhong Xue ◽  
Xiao Yan Zhou
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Molecular Dynamics ◽  
Carbon Nanotube ◽  
Binding Energy ◽  
Functional Groups ◽  
Functional Group ◽  
Young Modulus ◽  
Electrostatic Energy ◽  
Walled Cnts

The effects of functional groups and degree of functionalization on the young modulus of carbon nanotubes (CNTs) are investigated through molecular dynamics and molecular mechanics simulations. It is found that young’s modulus depends greatly on the functional groups and degree of functionalization. The results show that the fluorine (-F) can replace the hydrogen, and young modulus of sing-walled CNTs (SWNT) modified by -F functional group can inherit the mechanical properties of intrinsic SWNT. The binding energy between functional groups and SWNT, and electrostatic energy among the functional groups are mainly responsible for these findings. These characteristics rival those of SWNT modified by hydrogen allow one to consider SWNT modified by -F functional group for a range of technologies, in particular require better inertness and stability than unachievable for the compound.

pH/temperature dependent selective removal of trace Cr(vi) from aqueous solution by imidazolium ionic liquid functionalized magnetic carbon nanotubes

RSC Advances ◽  
2015 ◽  
Vol 5 (58) ◽  
pp. 47165-47173 ◽  
Author(s):  
Chunlai Wu ◽  
Jing Fan ◽  
Juhui Jiang ◽  
Jianji Wang
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Ionic Liquid ◽  
Carbon Nanotube ◽  
Selective Removal ◽  
Temperature Dependent ◽  
Imidazolium Ionic Liquid ◽  
Magnetic Carbon ◽  
Magnetic Carbon Nanotubes

Ionic liquid functionalized magnetic carbon nanotube (Fe3O4/CNT-IL) was prepared and used for selective removal of Cr(vi).

Functionalization effect on a Pt/carbon nanotube composite catalyst: a first-principles study

2016 ◽  
Vol 18 (32) ◽  
pp. 22687-22692 ◽  
Author(s):  
Byung-Hyun Kim ◽  
Kwang-Ryeol Lee ◽  
Yong-Chae Chung ◽  
Mina Park
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Functional Groups ◽  
First Principles ◽  
Atomic Oxygen ◽  
Composite Catalyst ◽  
Atomic Nitrogen ◽  
First Principles Calculations ◽  
Surface Functional Groups ◽  
Carbon Nanotube Composite

Chemical interactions between Pt and both pristine and defective carbon nanotubes (CNTs) that were functionalized with various surface functional groups, including atomic oxygen (–O), atomic nitrogen (–N), hydroxyl (–OH) and amine (–NH2) groups, were investigated through first-principles calculations.

scholarly journals Chemical Functionalization of Carbon Nanotubes and its Effects on Electrical Conductivity

2014 ◽  
Vol 28 ◽  
pp. 51-61 ◽  
Author(s):  
José Encarnación Moreno Marcelino ◽  
Enrique Vigueras Santiago ◽  
Gustavo Lopez-Tellez ◽  
Susana Hernández López
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Electrical Conductivity ◽  
Functional Groups ◽  
Compression Technique ◽  
Chemical Functionalization ◽  
Mechanical Stirring ◽  
Chemically Modified ◽  
Functionalization Of Carbon Nanotubes ◽  
Microraman Spectroscopy

This work presents the study of the electrical conductivity in MWNT as a function of three different chemical functionalization conditions. Unmodified and chemically modified MWNT were characterized by microRaman spectroscopy, XPS and SEM whereas the electrical conductivity was determined by dust compression technique. MWNT were modified using three different oxidation conditions: (1) a mix of concentrated acids, H2SO4/HNO3 (3:1, v/v) sonicated for 2 h; (2) same mixture as (1) but using mechanical stirring for 6 h and (3) a reflux of an aqueous solution of HNO3 (20%, v/v) and mechanical stirring for 6 h. The characterization evidenced different functionalization degrees, based on the formation and detection of functional groups such as ether, carbonyl and carboxyl in different percentages. The unmodified CNT presented a conductivity of 510 S/m which decreased as the functionalization degree increased. For reactions (1) and (2) such conductivity was reduced by 8.8 and 15.5%, respectively, whereas for condition (3) it only decreased 0.98%.

CARBON NANOTUBE-GRAFT-BLOCK COPOLYMERS CONTAINING SILVER NANOPARTICLES

2009 ◽  
Vol 08 (06) ◽  
pp. 533-541 ◽  
Author(s):  
MOHSEN ADELI ◽  
REZA SEPAHVAND ◽  
ALI BAHARI ◽  
BANDAR ASTINCHAP
Keyword(s):  
Carbon Nanotubes ◽  
Silver Nanoparticles ◽  
Carbon Nanotube ◽  
Block Copolymers ◽  
Functional Groups ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Multi Wall Carbon Nanotubes ◽  
Grafted Copolymer ◽  
Monomer Ratio

Polycaprolactone-polylactide block copolymers (PCL-block-PLA) were grafted onto filled multi-wall carbon nanotubes (MWCNT) successfully. In this synthesis, MWCNTs were opened and functionalized, and then they were filled by silver nanoparticles. The filled MWCNT were used as macroinitiator for ring opening polymerization of ε-caprolactone and L-lactide. Then the end hydroxyl functional groups of MWCNT-graft-PCL or MWCNT-graft-PLA were used as initiator for ring opening polymerization of lactide and ε-caprolactone and MWCNT-graft-PCL-block-PLA or MWCNT-graft-PLA-block-PCL were obtained, respectively. Length of grafted copolymer chains onto the MWCNT was controlled using CNT/monomer ratio. Nanocomposites' properties depend on the length of polymer blocks strongly. Structure of nanocomposites was evaluated by TEM and spectroscopy methods.

Heavy metal removal from aqueous solution by advanced carbon nanotubes: Critical review of adsorption applications

2016 ◽  
Vol 157 ◽  
pp. 141-161 ◽  
Author(s):  
Ihsanullah ◽  
Aamir Abbas ◽  
Adnan M. Al-Amer ◽  
Tahar Laoui ◽  
Mohammed J. Al-Marri ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Heavy Metal ◽  
Critical Review ◽  
Metal Removal ◽  
Heavy Metal Removal
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